Question about Heating & Cooling
Air con was on and suddenly went off, red stand by light off too. Will not switch back on. Circuit breaker did not trip. Cleaned filter. Want to check fuse as electrician s aid that's usually what it is but need to know where fuse is located in the indoor unit to check it.
Split system Air conditioners are very often on two or more separate breakers, with a control voltage (24vac commonly) connecting their operation. the condensor unit and out-door fan generally on a 220 vc 'paired' breaker, possibly a quick disconnect near the unit with fuses inside, or an independant breaker pair, and the evaporator unit with INDOOR fan on a 110 or 220 vac breaker.
switch the fan to 'ON' at the thermostat... this is the midpoint of the system electrically. If the fan comes on check for voltage at the condensor unit. a check to see if the thermostat is the problem... remove the thermostat and connect the red, green and either the white or yellow wires (not both) if you chose white you should have heat...yellow AC...
most split system AC have a small buss fuse on the control circuit board of the indoor unit. looks like a glass tube with metal caps held by metal clips. In 40+ yrs experience I have found it is more likely one or both of the 30 amp buss fuses near the outdoor unit (replace both even if one is still ok) or a 30 amp breaker in the quick disconnect box.
In many systems the control voltage to the thermostat derives from a transformer in the outdoor unit... it could be as simple as a broken wire. Without a full diagnostic, a complete description of the unit ( AC or heat pump, etc) this is all speculation
Posted on Nov 20, 2013
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Posted on Jan 02, 2017
Generally when an ac trips the main breaker and the breaker its self isn't bad, the compressor is going bad or is bad. To check you will need to do an ohms test on the compressor. If you get a reading of less than infinite, then the compressor is bad. You will need to test every lead going to the compressor which is usually 3 unless you have a crank house heater installed but they are not typical on a small unit. If the compressor has gone bad it is possible the it took the board out as well.
Posted on Mar 31, 2009
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