{"id":20965,"date":"2026-10-24T17:39:52","date_gmt":"2026-10-24T15:39:52","guid":{"rendered":"https:\/\/templari.com\/heat-pump-not-heating-problems\/"},"modified":"2026-10-26T12:43:29","modified_gmt":"2026-10-26T11:43:29","slug":"heat-pump-not-heating-problems","status":"publish","type":"post","link":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/","title":{"rendered":"Heat pump not heating or using too much electricity: the real causes and what to check"},"content":{"rendered":"<div id=\"aa\">\n<style>body:has(#aa){overflow:visible!important;overflow-x:clip!important}body:has(#aa) .featured-media-under-header{display:none!important}body:has(#aa) .container-wrap{padding:0!important;background:#000!important}body:has(#aa) .container-wrap .main-content,body:has(#aa) .main-content>.row,body:has(#aa) .post-area,body:has(#aa) article.post,body:has(#aa) article .inner-wrap,body:has(#aa) .post-content,body:has(#aa) .content-inner{max-width:none!important;width:100%!important;padding:0!important;margin:0!important;float:none!important}body:has(#aa) .comments-section{display:none}#aa{background:#000;color:#E9E8DD;font-family:Poppins,Arial,sans-serif;font-size:19px;line-height:1.7;-webkit-font-smoothing:antialiased}#aa *{box-sizing:border-box}#aa .hero{position:relative;min-height:58vh;display:flex;align-items:flex-end;background:#000 center\/cover no-repeat}#aa .hero:before{content:\"\";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.9) 0%,rgba(0,0,0,.6) 55%,rgba(0,0,0,.2) 100%),linear-gradient(0deg,#000 0%,rgba(0,0,0,0) 45%)}#aa .hero .in{position:relative;max-width:1160px;margin:0 auto;padding:120px 24px 44px;width:100%}#aa .badge{display:inline-block;font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:#0BABE4;border:1px solid rgba(11,171,228,.5);border-radius:999px;padding:6px 16px;margin-bottom:18px;background:rgba(0,0,0,.35);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}#aa h1{font-size:clamp(32px,4.4vw,52px);line-height:1.15;font-weight:700;color:#fff!important;margin:0 0 18px;max-width:20ch}#aa .lead{font-size:20px;color:#E9E8DD!important;max-width:62ch;margin:0}#aa .subnav{position:sticky;top:76px;z-index:20;display:flex;justify-content:center;padding:14px 12px;background:transparent;pointer-events:none}#aa .subnav nav{pointer-events:auto;display:flex;gap:6px;overflow-x:auto;max-width:100%;padding:6px;border-radius:999px;background:rgba(20,20,20,.72);border:1px solid rgba(255,255,255,.14);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);scrollbar-width:none}#aa .subnav a{white-space:nowrap;font-size:14px;font-weight:600;color:#E9E8DD!important;text-decoration:none!important;padding:8px 16px;border-radius:999px}#aa .subnav a.on,#aa .subnav a:hover{background:#0BABE4;color:#051822!important}#aa .sec{padding:52px 0;scroll-margin-top:150px}#aa .wrap{max-width:820px;margin:0 auto;padding:0 24px}#aa .num{font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:#0BABE4;margin:0 0 6px}#aa h2{font-size:clamp(28px,3.2vw,38px);line-height:1.2;font-weight:700;color:#fff!important;margin:0 0 18px}#aa p,#aa li{color:#E9E8DD!important;font-size:19px}#aa p{margin:0 0 18px}#aa a{color:#45E3FF!important;text-decoration:underline;text-underline-offset:3px}#aa ul,#aa ol{margin:0 0 18px;padding:0;list-style:none}#aa li{position:relative;padding-left:28px;margin:0 0 10px}#aa ul li:before{content:\"\";position:absolute;left:4px;top:.72em;width:9px;height:9px;border-radius:50%;background:#0BABE4}#aa figure{margin:30px 0}#aa figure img{display:block;width:auto;max-width:100%;max-height:600px;height:auto;margin:0 auto;border-radius:22px;box-shadow:0 22px 48px rgba(0,0,0,.45)}#aa figcaption{font-size:15px!important;line-height:1.5;color:#B9C6CC!important;margin-top:12px;text-align:left}#aa .chiara{background:#F5F4EE;color:#051822}#aa .chiara h2{color:#051822!important}#aa .chiara .num{color:#05587a}#aa .chiara p,#aa .chiara li{color:#1d2b33!important}#aa .chiara a{color:#05587a!important}#aa .chiara ul li:before{background:#05587a}#aa .chiara figure img{box-shadow:0 20px 44px rgba(5,24,34,.20)}#aa .chiara figcaption{color:#3C4F5A!important}#aa .chiara strong,#aa .chiara b{color:#051822}#aa table{width:100%;border-collapse:collapse;margin:0 0 20px;font-size:16px}#aa th,#aa td{padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.14);text-align:left;color:inherit!important;background:transparent!important}#aa .chiara th,#aa .chiara td{border-color:rgba(5,24,34,.14)}#aa .faq .wrap{max-width:1160px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:40px}#aa details{border-bottom:1px solid rgba(255,255,255,.16);padding:18px 0}#aa .chiara details{border-color:rgba(5,24,34,.16)}#aa summary{list-style:none;cursor:pointer;font-size:19px;font-weight:600;color:#fff;display:flex;justify-content:space-between;gap:18px}#aa .chiara summary{color:#051822}#aa summary::-webkit-details-marker{display:none}#aa summary:after{content:\"+\";color:#0BABE4;font-size:26px;line-height:1;font-weight:400}#aa .chiara summary:after{color:#05587a}#aa details[open] summary:after{content:\"\\2212\"}#aa details p{margin:12px 0 0}#aa .larga,#aa .fine .wrap{max-width:1160px}@media(min-width:1000px){#aa .duo .larga{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:56px;align-items:start}#aa .duo.inv .testo{order:2}#aa .duo .foto{position:sticky;top:190px}#aa .duo .foto figure{margin:0 0 26px}#aa .duo .foto figure:last-child{margin-bottom:0}#aa .duo .foto img{max-height:72vh}#aa .duo.senza .larga{grid-template-columns:minmax(0,1fr) minmax(0,1.6fr)}#aa .duo.senza .testa{position:sticky;top:190px}}body:has(#aa) #header-outer{background:#000!important}#aa .fine{padding:36px 0 52px}#aa .fine p{font-size:16px}@media(max-width:820px){#aa{font-size:18px}#aa p,#aa li{font-size:18px}#aa .hero{min-height:auto}#aa .hero .in{padding:96px 20px 32px}#aa .lead{font-size:18px}#aa .sec{padding:40px 0}#aa .wrap{padding:0 20px}#aa .subnav{top:64px}#aa .faq .wrap{grid-template-columns:1fr;gap:8px}}<\/style>\n<section class=\"hero\" style=\"background-image:url(https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p11-pompa-di-calore-aria-acqua-r290-nuova-2-5.jpg)\">\n<div class=\"in\"><span class=\"badge\">Technical tips<\/span><\/p>\n<h1>Heat pump not heating or using too much electricity: the real causes and what to check<\/h1>\n<p class=\"lead\">&#8220;Heat pump problems&#8221; is searched 140 times a month in the UK; in France &#8220;probl\u00e8me pompe \u00e0 chaleur&#8221; 27,100 and &#8220;ma pompe \u00e0 chaleur tourne mais ne chauffe pas&#8221; 390; in the Netherlands &#8220;warmtepomp storing&#8221; 170. We list what is normal, what is a wrong setting and what the real faults are, on the water side and on the unit side.<\/p>\n<\/div>\n<\/section>\n<div class=\"subnav\">\n<nav><a href=\"#s1\">First: is it defrosting?<\/a><a href=\"#s2\">Water side: too little water flows<\/a><a href=\"#s3\">Unit side: the real faults<\/a><a href=\"#s4\">It heats too little but is not broken<\/a><a href=\"#s5\">It uses too much<\/a><a href=\"#s6\">When to call for service<\/a><a href=\"#s7\">Frequently asked questions<\/a><\/nav>\n<\/div>\n<section id=\"s1\" class=\"sec duo\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">01<\/p>\n<h2>First: is it defrosting?<\/h2>\n<p>If the unit stops for a few minutes, the fan is still and a white cloud rises from the coil, it is defrosting: that is normal, and it restarts afterwards. See the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-ice-steam-water\/\" rel=\"noreferrer\">article on ice and steam<\/a>.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-non-scalda-cosa-controllare-en.jpg\" class=\"lazyload\" alt=\"The symptom and what to check\" width=\"760\" height=\"826\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-non-scalda-cosa-controllare-en.jpg\" alt=\"The symptom and what to check\" width=\"760\" height=\"826\" loading=\"lazy\"><\/noscript><figcaption>The symptom and what to check.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s2\" class=\"sec duo senza chiara\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">02<\/p>\n<h2>Water side: too little water flows<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>Many shutdowns come from the system, not the unit: low water pressure, air in the system, a clogged Y-strainer or a dirt separator full of sludge, a weak circulator. Too little water flows, the unit cannot hand over its heat and stops to protect itself. Our units measure water flow and pressure and raise an alarm when they drop; strainer and dirt separator are cleaned during <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-maintenance-servicing\/\" rel=\"noreferrer\">annual maintenance<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s3\" class=\"sec duo\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">03<\/p>\n<h2>Unit side: the real faults<\/h2>\n<p>Ice on the coil: if the 4-way valve does not switch, the unit cannot defrost and the coil stays white for hours (<a href=\"https:\/\/templari.com\/en\/news\/heat-pump-timed-or-demand-defrost\/\" rel=\"noreferrer\">article on defrosting<\/a>). Refrigerant leak: the unit performs less and less, then stops; our propane units are monobloc with a factory-sealed circuit (<a href=\"https:\/\/templari.com\/en\/news\/heat-pump-r290-how-it-is-built\/\" rel=\"noreferrer\">article on propane<\/a>). Worn compressor: it struggles to start and makes new noises, more often in oversized units that start and stop all the time (<a href=\"https:\/\/templari.com\/en\/news\/heat-pump-inverter-sizing-half-capacity\/\" rel=\"noreferrer\">article on sizing<\/a>). Electronics: sensors, boards, power supply; before blaming the unit, check the electrical panel, because surges and tripped protections often come from outside. A review by the Technical University of Denmark of 53 large heat pumps found fouled heat exchangers and refrigerant leaks to be the most frequent faults, and compressor faults the most serious.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-guasti-veri-en.jpg\" class=\"lazyload\" alt=\"Real faults, water side and unit side, and how to recognise them\" width=\"760\" height=\"833\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-guasti-veri-en.jpg\" alt=\"Real faults, water side and unit side, and how to recognise them\" width=\"760\" height=\"833\" loading=\"lazy\"><\/noscript><figcaption>Real faults, water side and unit side, and how to recognise them.<\/figcaption><\/figure>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/batteria-pompa-di-calore-inverno-brina.jpg\" class=\"lazyload\" alt=\"A coil in the snow: if the 4-way valve does not switch, the ice no longer goes away\" width=\"1600\" height=\"1200\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/batteria-pompa-di-calore-inverno-brina.jpg\" alt=\"A coil in the snow: if the 4-way valve does not switch, the ice no longer goes away\" width=\"1600\" height=\"1200\" loading=\"lazy\"><\/noscript><figcaption>A coil in the snow: if the 4-way valve does not switch, the ice no longer goes away.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s4\" class=\"sec duo senza chiara\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">04<\/p>\n<h2>It heats too little but is not broken<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>Often there is no fault at all: the weather compensation is set too low or with the wrong times (<a href=\"https:\/\/templari.com\/en\/news\/heat-pump-heating-curve-weather-compensation\/\" rel=\"noreferrer\">article on weather compensation<\/a>), the unit is switched on and off like a boiler (<a href=\"https:\/\/templari.com\/en\/news\/heat-pump-is-not-a-boiler-hcc\/\" rel=\"noreferrer\">article on why it is not a boiler<\/a>), or the system is not balanced and far rooms stay cold (<a href=\"https:\/\/templari.com\/en\/news\/how-to-balance-radiators-heat-pump\/\" rel=\"noreferrer\">article on balancing<\/a>).<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s5\" class=\"sec duo\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">05<\/p>\n<h2>It uses too much<\/h2>\n<p>We measure the two heaviest causes on our units: water at 55 \u00b0C instead of 35 \u00b0C makes the Kita X use 28% more, and a defrost every half hour doubles consumption, because COP drops from 3.5 to 1.75. Then an oversized unit, a small buffer that makes it start all the time (<a href=\"https:\/\/templari.com\/en\/news\/heat-pump-buffer-tank\/\" rel=\"noreferrer\">article on buffer tanks<\/a>), and the electric heater running for no reason. The real limits are on the <a href=\"https:\/\/templari.com\/en\/heat-pump-pros-and-cons\/\" rel=\"noreferrer\">page on pros and cons<\/a>.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-consuma-troppo-cause-en.jpg\" class=\"lazyload\" alt=\"How much two common causes raise running costs\" width=\"760\" height=\"480\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-consuma-troppo-cause-en.jpg\" alt=\"How much two common causes raise running costs\" width=\"760\" height=\"480\" loading=\"lazy\"><\/noscript><figcaption>How much two common causes raise running costs.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s6\" class=\"sec duo senza chiara\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">06<\/p>\n<h2>When to call for service<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>With an alarm on the display, a coil white for hours, a compressor that will not start or new noises: note the message and call for service. With the HCC electronics, service can see the alarms remotely. For an opinion, <a href=\"https:\/\/templari.com\/en\/contacts\/\" rel=\"noreferrer\">ask us for information<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s7\" class=\"sec faq\">\n<div class=\"wrap\">\n<div>\n<p class=\"num\">07<\/p>\n<h2>Frequently asked questions<\/h2>\n<\/div>\n<div>\n<details>\n<summary>Why is my heat pump not heating?<\/summary>\n<p>Often for water-side reasons (low pressure, air, clogged Y-strainer or dirt separator, circulator) or wrong settings. Among unit faults: ice on the coil from a 4-way valve that does not let it defrost, refrigerant leak, worn compressor, electronics.<\/p>\n<\/details>\n<details>\n<summary>My heat pump runs but does not heat: why?<\/summary>\n<p>Usually too little water flows (strainer, dirt separator, air, circulator, pressure) or the outdoor coil is blocked by ice. If it is defrosting, it restarts after a few minutes.<\/p>\n<\/details>\n<details>\n<summary>Why does my heat pump use so much electricity?<\/summary>\n<p>The heaviest causes are water that is too hot and constant defrosting: with the Kita X, water at 55 \u00b0C instead of 35 \u00b0C uses 28% more, and a defrost every half hour doubles consumption.<\/p>\n<\/details>\n<details>\n<summary>Why won&#8217;t my heat pump start?<\/summary>\n<p>Check the electrical panel and power supply first, then any alarm on the display: water pressure or flow, sensors, compressor. Note the message and call for service.<\/p>\n<\/details>\n<details>\n<summary>My heat pump is covered in ice: is it broken?<\/summary>\n<p>A layer of frost that comes and goes is normal. If the coil stays white for hours, the unit cannot defrost: it may be the 4-way valve, so call for service.<\/p>\n<\/details>\n<details>\n<summary>What are the most common heat pump faults?<\/summary>\n<p>In a review by the Technical University of Denmark of 53 large heat pumps, the most frequent are fouled heat exchangers and refrigerant leaks; the most serious are compressor faults.<\/p>\n<\/details>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"fine chiara\">\n<div class=\"wrap\">\n<p><small>Source: <a href=\"https:\/\/orbit.dtu.dk\/en\/publications\/a-review-of-common-faults-in-large-scale-heat-pumps\/\" rel=\"noreferrer\" rel=\"nofollow\">Aguilera et al., A review of common faults in large-scale heat pumps, Renewable and Sustainable Energy Reviews 168 (2022)<\/a><\/small><\/p>\n<p class=\"tpl-vedi-anche\"><strong>See also:<\/strong> <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-backup-heater\/\" rel=\"noreferrer\">Heat pump backup heater: when it switches on, how much it uses and when it is a warning sign<\/a><\/p>\n<p><em>All the technical tips are on the <a href=\"https:\/\/templari.com\/en\/technical-tips\/\" rel=\"noreferrer\">series page<\/a>.<\/em><\/p>\n<\/div>\n<\/section>\n<\/div>\n<p><script>(function(){var a=[].slice.call(document.querySelectorAll('#aa .subnav a')),n=document.querySelector('#aa .subnav'),h=document.getElementById('header-outer');function u(){if(n&&h)n.style.top=Math.max(0,h.getBoundingClientRect().bottom)+'px';var y=window.scrollY+200,c=null;a.forEach(function(l){var s=document.querySelector(l.getAttribute('href'));if(s&&s.offsetTop<=y)c=l});a.forEach(function(l){l.classList.toggle('on',l===c)});if(c&#038;&#038;c!==u.c){u.c=c;c.parentNode.scrollTo({left:c.offsetLeft-20,behavior:'smooth'})}}window.addEventListener('scroll',function(){u();setTimeout(u,400)},{passive:true});u()})();<\/script><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Why is my heat pump not heating?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Often for water-side reasons (low pressure, air, clogged Y-strainer or dirt separator, circulator) or wrong settings. Among unit faults: ice on the coil from a 4-way valve that does not let it defrost, refrigerant leak, worn compressor, electronics.\"}}, {\"@type\": \"Question\", \"name\": \"My heat pump runs but does not heat: why?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Usually too little water flows (strainer, dirt separator, air, circulator, pressure) or the outdoor coil is blocked by ice. If it is defrosting, it restarts after a few minutes.\"}}, {\"@type\": \"Question\", \"name\": \"Why does my heat pump use so much electricity?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The heaviest causes are water that is too hot and constant defrosting: with the Kita X, water at 55 \\u00b0C instead of 35 \\u00b0C uses 28% more, and a defrost every half hour doubles consumption.\"}}, {\"@type\": \"Question\", \"name\": \"Why won't my heat pump start?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Check the electrical panel and power supply first, then any alarm on the display: water pressure or flow, sensors, compressor. Note the message and call for service.\"}}, {\"@type\": \"Question\", \"name\": \"My heat pump is covered in ice: is it broken?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A layer of frost that comes and goes is normal. If the coil stays white for hours, the unit cannot defrost: it may be the 4-way valve, so call for service.\"}}, {\"@type\": \"Question\", \"name\": \"What are the most common heat pump faults?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"In a review by the Technical University of Denmark of 53 large heat pumps, the most frequent are fouled heat exchangers and refrigerant leaks; the most serious are compressor faults.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Technical tips Heat pump not heating or using too much electricity: the real causes and what to check &#8220;Heat pump problems&#8221; is searched 140 times a month in the UK;&#8230;<\/p>\n","protected":false},"author":3,"featured_media":13350,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","footnotes":""},"categories":[201],"tags":[],"class_list":["post-20965","post","type-post","status-publish","format-standard","has-post-thumbnail","category-technical-tips"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Heat pump not heating or using too much: causes | Templari<\/title>\n<meta name=\"description\" content=\"Heat pump not heating, not starting or using too much: defrosting, water pressure and flow, strainers, air, 4-way valve, refrigerant, compressor.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Heat pump not heating or using too much: causes | Templari\" \/>\n<meta property=\"og:description\" content=\"Heat pump not heating, not starting or using too much: defrosting, water pressure and flow, strainers, air, 4-way valve, refrigerant, compressor.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/\" \/>\n<meta property=\"og:site_name\" content=\"Templari\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-24T15:39:52+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-26T11:43:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p11-pompa-di-calore-aria-acqua-r290-nuova-2-5.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1672\" \/>\n\t<meta property=\"og:image:height\" content=\"669\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Templari Admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Templari Admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Heat pump not heating or using too much: causes | Templari","description":"Heat pump not heating, not starting or using too much: defrosting, water pressure and flow, strainers, air, 4-way valve, refrigerant, compressor.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/","og_locale":"en_US","og_type":"article","og_title":"Heat pump not heating or using too much: causes | Templari","og_description":"Heat pump not heating, not starting or using too much: defrosting, water pressure and flow, strainers, air, 4-way valve, refrigerant, compressor.","og_url":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/","og_site_name":"Templari","article_published_time":"2026-10-24T15:39:52+00:00","article_modified_time":"2026-10-26T11:43:29+00:00","og_image":[{"width":1672,"height":669,"url":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p11-pompa-di-calore-aria-acqua-r290-nuova-2-5.jpg","type":"image\/jpeg"}],"author":"Templari Admin","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Templari Admin","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/#article","isPartOf":{"@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/"},"author":{"name":"Templari Admin","@id":"https:\/\/templari.com\/en\/#\/schema\/person\/48abcdf90f9b7b3bd2227e6d67fc2a57"},"headline":"Heat pump not heating or using too much electricity: the real causes and what to check","datePublished":"2026-10-24T15:39:52+00:00","dateModified":"2026-10-26T11:43:29+00:00","mainEntityOfPage":{"@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/"},"wordCount":888,"image":{"@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/#primaryimage"},"thumbnailUrl":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p11-pompa-di-calore-aria-acqua-r290-nuova-2-5.jpg","articleSection":["Technical tips"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/","url":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/","name":"Heat pump not heating or using too much: causes | Templari","isPartOf":{"@id":"https:\/\/templari.com\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/#primaryimage"},"image":{"@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/#primaryimage"},"thumbnailUrl":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p11-pompa-di-calore-aria-acqua-r290-nuova-2-5.jpg","datePublished":"2026-10-24T15:39:52+00:00","dateModified":"2026-10-26T11:43:29+00:00","author":{"@id":"https:\/\/templari.com\/en\/#\/schema\/person\/48abcdf90f9b7b3bd2227e6d67fc2a57"},"description":"Heat pump not heating, not starting or using too much: defrosting, water pressure and flow, strainers, air, 4-way valve, refrigerant, compressor.","breadcrumb":{"@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/#primaryimage","url":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p11-pompa-di-calore-aria-acqua-r290-nuova-2-5.jpg","contentUrl":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p11-pompa-di-calore-aria-acqua-r290-nuova-2-5.jpg","width":1672,"height":669,"caption":"Pompa di calore aria-acqua a R290 Templari"},{"@type":"BreadcrumbList","@id":"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/templari.com\/en\/"},{"@type":"ListItem","position":2,"name":"Heat pump not heating or using too much electricity: the real causes and what to check"}]},{"@type":"Person","@id":"https:\/\/templari.com\/en\/#\/schema\/person\/48abcdf90f9b7b3bd2227e6d67fc2a57","name":"Templari Admin","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/9f5f0005755bddc0e66d18c21bde62cb7ac725c3e4a3cb7dcbdf3c1cfce63f21?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/9f5f0005755bddc0e66d18c21bde62cb7ac725c3e4a3cb7dcbdf3c1cfce63f21?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9f5f0005755bddc0e66d18c21bde62cb7ac725c3e4a3cb7dcbdf3c1cfce63f21?s=96&d=mm&r=g","caption":"Templari Admin"}}]}},"permalink_manager":null,"_links":{"self":[{"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/posts\/20965","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/comments?post=20965"}],"version-history":[{"count":0,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/posts\/20965\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/media\/13350"}],"wp:attachment":[{"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/media?parent=20965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/categories?post=20965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/tags?post=20965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}