{"id":4481,"date":"2026-09-08T09:00:00","date_gmt":"2026-09-08T09:00:00","guid":{"rendered":"https:\/\/www.paradigmcooling.co.za\/articles\/?p=4481"},"modified":"2026-09-08T09:00:00","modified_gmt":"2026-09-08T09:00:00","slug":"how-to-test-a-capacitor-on-an-air-conditioner","status":"publish","type":"post","link":"https:\/\/www.paradigmcooling.co.za\/articles\/2026\/09\/08\/how-to-test-a-capacitor-on-an-air-conditioner\/","title":{"rendered":"How to Test a Capacitor on an Air Conditioner (And What the Reading Actually Means)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A compressor or condenser fan that hums and doesn&#8217;t turn sends most technicians straight to the capacitor \u2014 and most condemn it by eye, or replace it on a guess, without ever putting a number against it. That&#8217;s backwards: a capacitor can be 30-40% out of tolerance and still look flawless, so appearance settles nothing. By the end of this article you&#8217;ll be able to run the test properly, do the tolerance arithmetic without hesitating, and tell a genuinely failed capacitor from one that&#8217;s being blamed for a fault somewhere else.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What the capacitor is actually doing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A single-phase motor has a run winding and a start winding, set about 90 electrical degrees apart in the stator. Feed both from the same 230 V, 50 Hz supply with no capacitor in circuit and their magnetic fields rise and fall together, in phase \u2014 displaced in space but not in time, so they pulse rather than rotate. A pulsing field has no direction to pull the rotor in: the rotor sits still, current climbs, and the motor hums until the overload trips.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The capacitor&#8217;s job is to shift the timing, wired in series with the start winding so start-winding current leads run-winding current by an angle approaching 90 electrical degrees. Now displaced in both space and time, the two fields combine into one that rotates and drags the rotor into motion. Let the capacitor&#8217;s value drift far enough off nameplate and that phase shift collapses, and you&#8217;re back to humming instead of starting.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Run capacitors versus start capacitors<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Run capacitors<\/strong> stay in circuit for as long as the motor runs: metallized polypropylene film, oil-filled, self-healing, built for continuous duty. Typical values run 1.5 \u00b5F to 70 \u00b5F, cans stamped 370 V or 440 V.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Start capacitors<\/strong> are in circuit only for the second or two it takes the motor to reach roughly 75% of synchronous speed, after which a relay or PTCR device drops the winding out. They&#8217;re electrolytics with much higher values \u2014 typically 80 \u00b5F to 400 \u00b5F \u2014 rated for intermittent duty only: no more than about 20 starts per hour, each a few seconds. Leave one permanently in circuit and it overheats and fails within days.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The voltage rating looks oversized for a 230 V supply on purpose. The run winding&#8217;s reactance and the capacitor&#8217;s own reactance form a series circuit, so voltage across the capacitor is the vector sum of supply and winding voltage \u2014 not simply 230 V. In practice it commonly reaches 300-400 V, which is why 370 V and 440 V cans exist. Fit a higher voltage rating than the original if you need to \u2014 never a lower one. A 370 V capacitor fitted where 440 V is specified runs above its design margin and fails early, sometimes violently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Dual capacitors: reading C, FAN and HERM correctly<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A dual run capacitor is two capacitors sharing a common plate in one can, on three terminals: <strong>C<\/strong> (common), <strong>FAN<\/strong>, and <strong>HERM<\/strong>. The nameplate shows two values, for example &#8220;35+5 \u00b5F&#8221; \u2014 the larger value (35 \u00b5F) is the compressor side, the smaller (5 \u00b5F) the fan side.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C<\/strong> connects to the supply leg common to both loads (typically L2 off the contactor). <strong>HERM<\/strong> feeds the compressor&#8217;s start winding with the larger value; <strong>FAN<\/strong> feeds the fan&#8217;s start winding with the smaller value. Swap them and the compressor gets only the small fan-rated capacitance \u2014 not enough phase shift for full torque, so you get hard starting and overload trips, while the fan motor, driven by a value it was never designed for, runs hot and rough. Wire from the nameplate marking, never from terminal position or can size.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The test, in order, every time<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li><strong>Isolate.<\/strong> Kill the supply at the isolator or DB, lock and tag it per your site&#8217;s OHS Act 85 of 1993 procedure and SANS 10142-1 isolation practice.<\/li><li><strong>Discharge.<\/strong> Bridge a 20 k\u03a9, 5 W resistor across the terminals for a few seconds, then confirm 0 V with your meter before you touch anything bare-handed.<\/li><li><strong>Disconnect at least one lead.<\/strong> A capacitor measured in circuit reads through whatever else is wired in parallel \u2014 windings, bleed resistors, relay coils \u2014 and the figure you get is not the capacitor&#8217;s true value.<\/li><li><strong>Measure capacitance.<\/strong> Meter on its \u00b5F function, probes across the two terminals (or C-to-FAN, then C-to-HERM on a dual capacitor). Compare the reading to the nameplate value against tolerance.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Safety note:<\/strong> a run capacitor that has just been running, or has sat isolated for hours, can still hold several hundred volts across its terminals. Never short the terminals with a screwdriver blade \u2014 low internal resistance dumps the entire stored charge into a dead short in under a millisecond, a spike of hundreds of amps that can weld the blade and spatter molten metal. Stored energy follows E = \u00bdCV\u00b2: a 40 \u00b5F capacitor at 400 V holds 0.5 \u00d7 40\u00d710\u207b\u2076 \u00d7 400\u00b2 = 3.2 joules \u2014 small by everyday standards, but enough to burn skin delivered in under a millisecond. That&#8217;s why the bleed resistor and the zero-volt check aren&#8217;t optional.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The tolerance arithmetic<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tolerance is normally <strong>\u00b16% of nameplate for a run capacitor<\/strong> and <strong>\u00b120% for a start capacitor<\/strong> \u2014 the wider band reflects looser electrolytic manufacturing tolerance. Work it out before you condemn or clear anything:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nameplate value<\/th><th>Lower limit (\u00d70.94)<\/th><th>Upper limit (\u00d71.06)<\/th><th>Serviceable range<\/th><\/tr><\/thead><tbody><tr><td>5 \u00b5F run<\/td><td>4.7 \u00b5F<\/td><td>5.3 \u00b5F<\/td><td>4.7-5.3 \u00b5F<\/td><\/tr><tr><td>45 \u00b5F run<\/td><td>42.3 \u00b5F<\/td><td>47.7 \u00b5F<\/td><td>42.3-47.7 \u00b5F<\/td><\/tr><tr><td>70 \u00b5F run<\/td><td>65.8 \u00b5F<\/td><td>74.2 \u00b5F<\/td><td>65.8-74.2 \u00b5F<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Below the lower limit is failed, full stop, regardless of what the case looks like.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Take a real case: a condenser fan motor hums when the contactor pulls in and doesn&#8217;t turn. Pull-in and 230 V at the motor are both confirmed, and clamp current sits well above nameplate FLA until the overload trips. The run capacitor nameplate reads 5 \u00b5F, 370 V. Isolated, discharged, one lead disconnected, the meter reads 2.9 \u00b5F \u2014 41% below nameplate and well under the 4.7 \u00b5F lower limit. Not borderline: failed. At 2.9 \u00b5F the phase shift is too small to break the rotor away, so current stays high because the rotor never leaves standstill. Fit a new 5 \u00b5F capacitor and the motor breaks away immediately, current back at nameplate FLA. The capacitor, not the contactor, was the fault, pinned by the number rather than a guess \u2014 the same humming symptom that sends a lot of technicians straight to <a href=\"https:\/\/www.paradigmcooling.co.za\/articles\/how-to-test-a-contactor-properly\/\">testing a contactor properly<\/a> instead.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why a flat case proves nothing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A bulged, split, or leaking case is a reliable positive indicator \u2014 internal pressure from a breaking-down dielectric deforms the can, so a domed top or split seam condemns the capacitor before you reach for the meter (still measure and log the value for the record). But a flat, clean-looking case proves nothing. The dielectric thins and the capacitance drifts long before the can shows any external sign, and most capacitors that fail a \u00b5F test look completely normal. Appearance can confirm a fail; it can never confirm a pass. Every capacitor gets measured, not eyeballed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The old trick of touching analogue ohmmeter leads across a capacitor and watching the needle swing toward zero, then drift back to infinity, is a valid quick check for exactly two conditions: no swing at all means open, a swing that pins at zero and stays means shorted. That&#8217;s the entire extent of what it tells you. A capacitor can swing perfectly normally on that test and still have lost 30-40% of its rated capacitance \u2014 it is not a substitute for a capacitance-function reading against tolerance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Recognising a weak capacitor before it fails outright<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A capacitor that has drifted low but not failed produces a recognisable pattern: hard starting with a delayed, straining pickup; humming without starting; starting current sitting 15-30% above nameplate FLA and staying there; a thermal protector tripping after a few minutes&#8217; run because the weak start winding runs hotter than design; and a compressor that starts when helped \u2014 a hand spin, or a hard-start kit \u2014 but is not actually fixed by that help. A helped start proves a torque deficit exists; it does not prove it&#8217;s been corrected. This exact pattern is often mistaken for <a href=\"https:\/\/www.paradigmcooling.co.za\/articles\/why-your-compressor-keeps-tripping-the-overload\/\">a compressor that keeps tripping its overload<\/a> for reasons that have nothing to do with the capacitor.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hard start kits: a diagnosis, not a repair<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A PTCR (positive temperature coefficient resistor) across the run capacitor&#8217;s HERM leg presents low resistance cold, gives the start winding a brief current boost, self-heats within seconds, and drops out of circuit. A potential relay and start capacitor kit does the same job more robustly. Both add real starting torque.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fitting one to confirm a torque deficit is a legitimate diagnostic step. Fitting one and calling the job done is not. If the underlying cause is worn bearings or excessive static head, the kit gets the compressor turning today while the mechanical fault worsens. If the cause is a supply chronically below 230 V \u2014 195-205 V is common on overloaded circuits \u2014 the kit hides a compliance issue that should be measured and corrected under SANS 10142-1.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Final Thoughts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A capacitor test has exactly one honest outcome: a \u00b5F reading compared against nameplate tolerance, taken with the component isolated, discharged, and disconnected from anything wired in parallel. Everything else \u2014 the shape of the case, the needle swing, whether it helps when nudged \u2014 is a clue at best and a false confidence at worst. Learn how this fits the wider picture in the <a href=\"https:\/\/www.paradigmcooling.co.za\/hvacr-learning-library\/hvacr-electrical-diagnostics-the-complete-guide-to-electrical-troubleshooting-testing-and-fault-finding\/\">complete guide to electrical troubleshooting and fault-finding<\/a>, and treat every capacitor the same way going forward: measure it, do the arithmetic, and let the number decide.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A compressor or condenser fan that hums and doesn&#8217;t turn sends most technicians straight to the capacitor \u2014 and most condemn it by eye, or [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36,18],"tags":[],"class_list":["post-4481","post","type-post","status-publish","format-standard","hentry","category-electrical-diagnostics","category-technical"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Test a Capacitor on an Air Conditioner (And What the Reading Actually Means) - &quot;Paradigm Cooling: Your Go-To HVAC &amp; Refrigeration Blog for Common Technical Questions&quot;<\/title>\n<meta name=\"description\" content=\"Paradigm Cooling answering the most frequently asked HVAC and refrigeration related questions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.paradigmcooling.co.za\/articles\/2026\/09\/08\/how-to-test-a-capacitor-on-an-air-conditioner\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Test a Capacitor on an Air Conditioner (And What the Reading Actually Means) - &quot;Paradigm Cooling: Your Go-To HVAC &amp; Refrigeration Blog for Common Technical Questions&quot;\" \/>\n<meta property=\"og:description\" content=\"Paradigm Cooling answering the most frequently asked HVAC and refrigeration related questions.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.paradigmcooling.co.za\/articles\/2026\/09\/08\/how-to-test-a-capacitor-on-an-air-conditioner\/\" \/>\n<meta property=\"og:site_name\" content=\"&quot;Paradigm Cooling: Your Go-To HVAC &amp; 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