A/C works until temps get high
#1
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A/C works until temps get high
Hi All
I have a 9 year old Goodman propane furnace and A/C located in the garage (compressor outside). We have never used the heat but with our northern California summers, use the A/C most days for about 3 months. The following problem began about 6 weeks ago: The A/C works fine for most of the day until the temperature in the garage, typically late in the day (5 to 6 p.m.), gets hot. At that point, when the thermostat calls for cooling, the furnace blower comes on but the compressor does not – no exhaust fan, no compressor.
I have had repairmen out 3 times and of course, the problem won’t replicate (the garage doesn’t get hot enough until normal work hours are just about over). They have checked relays, capacitor, voltages at the compressor, etc and everything is within specs. In frustration, I changed out the control board and cleaned the relay points but to no avail. Any thoughts on what might be happening?
Thanks
I have a 9 year old Goodman propane furnace and A/C located in the garage (compressor outside). We have never used the heat but with our northern California summers, use the A/C most days for about 3 months. The following problem began about 6 weeks ago: The A/C works fine for most of the day until the temperature in the garage, typically late in the day (5 to 6 p.m.), gets hot. At that point, when the thermostat calls for cooling, the furnace blower comes on but the compressor does not – no exhaust fan, no compressor.
I have had repairmen out 3 times and of course, the problem won’t replicate (the garage doesn’t get hot enough until normal work hours are just about over). They have checked relays, capacitor, voltages at the compressor, etc and everything is within specs. In frustration, I changed out the control board and cleaned the relay points but to no avail. Any thoughts on what might be happening?
Thanks
#4
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does it have a condensate pump? Could be filling with water and shutting ac down. Could be a dirty condenser that, in the heat of the day, causes the head pressure to rise and forces the unit to shut off. But if that were the case the small copper line to outdoor unit would be hot to the touch while running.
#6
No Pro...but I might wonder about the transformer? When heated, might be providing enough to run the stat and any relays for the blower...but not enough for the contactor?
As clocert said...need to check that and use a voltmeter to check voltage.
As clocert said...need to check that and use a voltmeter to check voltage.