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crcuevas 01-14-2012 07:14 AM

TRANE HVAC breaker turning off
Our Trane HVAC breaker keeps turning off after awhile. It runs for about a few hours and then breaker turns off. Well this morning it about 25 degrees and it ran all night @64 degrees and then it turn off again. I flip the breaker and it ran for 10min and breaker turned off again. Any thoughts?

bob22 01-14-2012 07:57 AM

Is this a heat pump or gas furnace?
MIght post a model number of the system's big parts to help the pros.

biggles 01-14-2012 08:02 AM

from the circuit breaker out to the condenser and into the air handler check all electrical connections and look for dis colored insulation at the terminal wires the bigger loads are the resistance heat and the condenser running defrost and they should be seperate one for the condenser and one for the air handler/electric heat....? which is tripping.

crcuevas 01-14-2012 08:16 AM

Sorry its a Trane Heat Pump TWE048C14,0C,FC. The breaker that is tripping is connected to the air handler.

hvac5646 01-14-2012 08:29 AM

Your breaker could be weak or if you have electric heat something bad in it's wiring.

Experience tells me more than likely its a motor going bad.

Have you been keeping up with your filter changes, cause if the motor over heats it can cause a an intermittent short in the motor windings that will only show it self when it has run and warmed up. ,

crcuevas 01-14-2012 08:57 AM

Ok. That's a good point but if i just turn on the fan only, it runs fine and is'nt the blower motor?

Also notice that the AUX HEAT comes on for awhile then goes away.

bob22 01-14-2012 08:58 AM

The blower in the house is different from the motor in the compressor outside; that is what hvac5646 was writing about.

crcuevas 01-14-2012 09:18 AM

Ok there two breaker boxes. One for the handler (which is tripping) and the one outside for the heat pump (that one is not tripping). So which motor are you talking about? The handler or heat pump?

hvac5646 01-14-2012 09:33 AM

your air handler.

Ur Aux heat is turning off before it hits stat set point? if so than they could be tripping on safty. that will trip a breaker if they are cycling on limit.
Wire gets hot and the breaker opens.

Is the breaker warm to the touch after tripping?

crcuevas 01-14-2012 09:43 AM

Thanks HVAC5646. No, the breaker box is not warm at all. That was first thing i checked. That's why I'm confused. So its possible that the fan motor is getting ready to go?

bob22 01-14-2012 09:46 AM

Can you get the house (inside one) fan to run if you set the thermostat to Fan Run or Fan Only or Fan On (whatever is on your thermostat)?
Does the fan motor make any noises or try to move when you do this (might take two people; one to switch thermostat and one to listen)?

biggles 01-14-2012 09:52 AM

just run the fan from the sta see if he breaker trips if it dows shut the service switch at the air handler and touch the suplly fan motor isit hot on the frame...if it doesn't trip then it's your resistance heat section tripping the breaker...and short cycling on a auto limit might be overheating the elements filter and squirrels cage fins in fan section are clean

hvac5646 01-14-2012 10:02 AM

If the short is deep in the windings it could take hours of run time to trip.

An amp meter or a watt meter connected to the motor would be able to read the current when it starts to peak. Dead. short would trip the breaker instantly.

crcuevas 01-14-2012 10:19 AM

Thanks biggles. I'll try that first and run the fan only and see if it trips the breaker. So where is the "resistance heat section" located? Where is the rest of stuff your suggesting that may be causing the tripping?

Also the fan doesn't make any noise. Sounds normal. And it may take hours before it may trip again. :(

Can some point out the location what "biggles" talking about?

harleyrider 01-14-2012 10:33 AM


Originally Posted by crcuevas (Post 822261)
Thanks biggles. I'll try that first and run the fan only and see if it trips the breaker. So where is the "resistance heat section" located? Where is the rest of stuff your suggesting that may be causing the tripping?

I hate to see anyone get electrocuted or have a fire start in your house......I lived through a house fire and it is not a pleasant experience. The unit you are having problems with is a sophisticated electrical component, with complicated electrical circuitry inside of it.

Voltages inside of your air handler range from as little as 24 volts to as high as 440 volts potential. Any technician that was to work on your unit would need at least 4 years of education, experience and training. When a breaker trips repeatedly it means that there is a SERIOUS electrical problem occurring, within the circuit.

Are you willing to risk the well being of your home and family to save a few bucks on a repair or your homes primary heating system ? I suggest that you go no further and you call a professional, if you chose not to take my advice then I bid you good luck.

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