Drawing showing the key parts to a modern air conditioning compressor/condensor unitAir Conditioner / Heat Pump Repair Procedures
How to Fix an A/C or Heat Pump not working, won't start, not cool, weak airflow, noises, etc

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Air conditioner & heat pump repair procedures:

The articles listed below describe in detail the inspection, troubleshooting diagnosis, and repair of all types of residential and light commercial central air conditioning and heat pump systems.

Page top image and airhandler image below were provided courtesy Carson Dunlop Associates.

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A/C - Heat Pump Repair Guides: How to diagnose and fix an air conditioning system that is not working

Loose blower assembly pulley or belt reduces airflow (C) Carson Dunlop AssociatesList of A/C or Heat Pump Diagnostic Procedures

Since the failure of an air conditioner to turn on, loss of air conditioner cooling capacity, reduced air conditioning output temperatures, loss of cool air supply, or even loss of air flow entirely can be due to a variety of problems with one or more components of an air conditioner or air conditioning system, after reviewing the lost air conditioner cooling diagnosis procedures described in this article, be sure to also review the diagnostic procedures at each of the individual air conditioning diagnosis and repair major topics listed just below.

Electrical problems on HVAC systems: Keep in mind that despite the depth of technical detail you will find here about all components of air conditioners and heat pumps, most service calls for non-working air conditioners or heat pumps turn up an electrical problem. So if your A/C system is just not working at all be sure to check all of our electrical and control setting suggestions first.

Mechanical problems on HVAC systems: tend to fall into these groups: refrigerant leaks, dirty condenser coil or unit, dirty evaporator or cooling coil, or burned out (or hard-starting) compressor motors. We have also seen a number of problems with fans and fan motors in both the compressor/condenser unit and in the air handler/blower fan unit. Some of those fan problems are mechanical - like a loose fan belt or blade.

If your air conditioning or heat pump system has completely lost cooling capacity or if it plain won't start you can jump right to AIR CONDITIONER NOT WORKING or select one or more of the diagnostic articles listed below.

Honeywell room thermostat


Continue reading at AIR CONDITIONER DIAGNOSTIC CHECKS or select a topic from the More Reading links or topic ARTICLE INDEX shown below.

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REPAIR GUIDES A/C / HEAT PUMP at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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