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40 amp breaker at panel to air handler trips when you turn the heat on but not when the air is turned on

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  • djplatinumck Jan 21, 2009

    I have a problem when i turn on my heat it comes on and then about 5 min latter trips, but not with air? what can i do to fix it?

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You could have one of two problems.

One , heaters could be shorted out causing the breaker to trip from and overdraw of current.

Two, your breaker could be weak and tripping prematurely.

Posted on May 13, 2008

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Any ideas as to why the panel breaker for my Goodman CPE24-1AB heat pump would immediately trip when the air conditioner is turned on?


Without looking up the specifications for this heat pump, I cannot be certain, but I expect the operation to provide cooling may require more power than when heating. You probably can find the specifications online for this unit. As you probably know, power is measured in watts and is calculated by voltage times current. This also is likely to be 240 volts operation. If you take the specified power on cooling and divide by voltage (240), that will indicate the current in amperage that will be required to start it. Your circuit breaker is set for current and needs to be a higher current than is required. If that is the problem, you can buy circuit breakers at Home Depot or Lowes. You have to remove the front panel of your breaker box and snap out the circuit breaker. To be safe it would be good to turn off the main breaker switch before you open the front panel and remove the circuit breaker for the heat pump. Should your calculation of current required be less than the rating of the circuit breaker, that implies a malfunction of the heat pump in the cooling mode and would require a service call to the local representative of the heat pump manufacturer.

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The thermostat clicks but nothing else happens, no a/c will come out or no heat [I tried both]


(I have this model at my home). If you switch it over to emergency heat and nothing comes out then check the breakers behind the panel for the air handler (inside unit)
There may be other issues, mine had a sequencer which had come apart. The newer
sequencers have a retainer clip to prevent this. It is located under the galvanized cover inside the indoor unit next to the transformer.

Also check the breakers at the main panel (there should be two double breakers, one should be a 20 to 25 amp for the outside unit and the other should be around 70 amps for the indoor unit). Fully reset them after performing checks described later. .
If your outdoor condensor compressor is failing (as mine did), it will trip the smaller breaker, if your indoor unit has a short or other problem it will trip either the 50 or the 70 amp breaker. Make sure you turn off all breakers before inspecting.

One last thought, if your thermostat has battery backup and the transformer has failed, you will still hear the click but nothing will operate
since the 24 volt transformer operates both the indoor and outdoor units.
It is located under the galvanized cover inside the indoor unit.
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Hello, my heat pump is a 4 ton unit, it heats ok but it keeps tripping one of the breakers, the 40 amp cooling breaker. I have put a new thermostate, it keeps running after the breaker is tripped and the...


Hello Jack,

Let me see if I have this right. Your heat pump keeps triping the breaker that is going to your airhandler. The Heatpump is on its on breaker and can not trip the breaker on your air-handler. However, the 40 amp breaker is to you heat pump its self (the outside unit). The thermstat is not the porblem as all it does is call for heat or cool. The problem can be one or a cobination of three things the contactor, the run capcitor or the breaker is weak.

The first thing I would do is replace the breaker as if it has tripped more than twice it needs to be replaced. Then I would look at the contactor, it is located underneath the service panel it will have some low voltage wires on the sides and a black and white wire running to it from the disconect box. If you notice the contacts are chared (little copper points in the middle of the contactor) I would replace it. If the contactor looks good I would remove the capcitor (carefully not to touch to contacts at once as they hold a charge) and take if to the local parts house and have it tested.

I hope that I have asnwered you question and you are able to take care of the problem. Thank you for using FIxya and do not hesitate to ask more questions.

Justin

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