Tip & How-To about Heating & Cooling

Fuse blown or breaker tripped

Due to short circuit or burnt wiring in air conditioning. It may happens due to high voltage or undersized wiring. When fan motor or compressor grounded, then it will trip the breaker or blow the fuse.Fuse wires should be 3 times amps of actual running amps.Breaker should be same. If your a/c model current is 8.3 amps, breaker/fuse should be 25 amps.

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I have a carrier roof top unit that goes off on short cycles. how should i trouble shoot


It could be Low on Freon and going OFF on low pressure switch.......
Or it could be a dirty condensor coil or a Condensor Fan Motor not running and going OFF on High pressure switch....

Or if you are running the RTU in Low Ambient Conditions like 50* to 60* degrees Outside the Condensor Fan Motors could be cycling on a Fan Cycling Control....which is normal operation

So it could be any one of these or something different I would need to know what you are talking
about what is cycling??? Fan, Compressor , blower motor, whole unit shuting down, etc.

May 14, 2011 | Heating & Cooling

1 Answer

I have a Amana PTAC model PTC123A50AC never had any problems until this a.m. walked into office were installed no heat. Breaker tripped, reset breaker, nothing. Checked outlet, getting power. Any idea's?


To all friends! Whenever you find breaker tripped or fuse blown, it's an indication some device/s are in problem.
To get tripped breaker:
1. Condenser too dusty- clean it.2. Fan motor or compressor grounded-Replace. 3. Compressor high amps due to capacitor weak-replace capacitor. 4. Burnt wire-rectify. 5.Short circuit-rectify.

Jan 11, 2011 | Amana Heating & Cooling

2 Answers

my goldstar turns on and hums, but no cold air. then it blows a circuit breaker


First you should check the power for short circuit, second you have to check the fan motor if it is burnt or not,third check whether the compressor is burnt or not.These are the three reasons.If the powering is short circuited change the cables from the mccb.If the fan motor is burned out replace the fan motor or rewind the fan motor.If the compressor is burnt out replace the compressor, evacuate the refrigeration system and charge the refrigerant.

Aug 15, 2009 | Heating & Cooling

2 Answers

air conditioner trips breaker


The circuit breaker could be tripping because its old and getting too warm; it could trip because of a short circuit or an overcurrent condition. You need an ammeter so that you can check the current draw on the line.

The ammeter will also assist you to find which component is drawing too much current, or if the problem is a short circuit.

Jul 23, 2009 | Heating & Cooling

1 Answer

Neither fan or compressor will com on


You have a short circuit in the system at some point. A blown fuse on the circuit board indicates a short in the control circuit. Tripping of the breaker indicated a high voltage draw from the compressor. Check the compressor motor terminals with the wires removed and the power off. Use an Ohm meter from a terminal to ground. You should have no reading. If you have any reading the compressor motor is shorted out and the compressor is done.

Jun 17, 2008 | Dometic Rooftop RV Air Conditioner

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