Question about Heating & Cooling
The entire a/c unit will not come on at all. The air compressor, fan, heat none of it will come on. It is getting power to it. What could be the problem? It mearly just stopped working with no obvious reason.
If you have a digital thermostat check the battery. After you change the battery switch the fan to the on position. The fan should come on. If it does not the transformer that supplies the voltage for the control circuit could be bad. Check the fuse at the air handler and the off/on switch also to make sure it is on at the air handler (Furnace).
Posted on May 17, 2008
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Posted on Jan 02, 2017
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Aug 20, 2014 | Dometic Rooftop RV Air Conditioner
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. To return to our air conditioning and refrigeration home page go to AIR CONDITIONING & HEAT PUMP SYSTEMS.
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. MORE DETAILS
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