HVAC Questions? Ask an HVAC Expert for Answers ASAP
All work to be done by licensed professional. WE KEEP GOING UNTIL YOU HAVE THE INFORMATION YOU NEED, I come and go. This is step ONE.
Hello, welcome to Just Answer !
The problem is in the electronics controls that operate the outside fan motor...its not in the thermostat as long as the compressor runs... and by the fact that the outside coil gets *very warm we know the compressor is running....
..further, the compressor should go off on its high pressure safety cut out when the outside fan fails... *do not let it run in that condition, it can destroy the compressor*
This is not something you will be able to trouble shoot and repair yourself.. its not something you can reset or a minor thermostat issue.
Let me know if you have any questions, we keep going as long as you need to, there are not time limits.
The only control outside is the defrost board so you think the problem is with that?
Hello again, yes it can be the defrost board easily... the defrost board shuts the outside fan off when the unit is heating mode...and... when the coil gets too much frost on it... then, at that time...the defrost board, reverses the 4 way valve into cooling, blows the hot gas to the outside coil, and kills the outside fan motor.
( Otherwise in heating mode, the outside fan runs whenever the compressor runs. )
Is there any other part you can think of that could cause this problem or you feel it pretty much has to be that board?
Chances its the board are in the 90% range. or higher.
OK thank you very much for your help.
We don't need AC here much so I have been a bit resistant to buy a new defrost board. I did notice though when I have the problem tripping the breaker to the outdoor unit off and on does not fix it. Only tripping the breaker to the air handler off and on fixes the problem temporarily. Still think it is the defrost board outside?