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Ask Mark Henley Your Own Question
Mark Henley
Mark Henley, Journeyman Technician
Category: HVAC
Satisfied Customers: 3217
Experience:  UA Journeyman Pipefitter , HVAC, Refrigeration, DDC controls. 26 years.Commercial & residential
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My furnace will not stop running until I throw the breaker.

Customer Question

My furnace will not stop running until I throw the breaker. I have replaced the wall trhermostat. That did not fix the problem. Why won't the furnace kick off when it reaches the desired temperature? Sometimes it will, but this morning it caused all my electric to shut down because my breakers got too hot!
Submitted: 7 years ago.
Category: HVAC
Expert:  Mark Henley replied 7 years ago.

Hi,

 

Is this electric heat or heatpump , or please advise ,

 

Thanks

 

Mark

Customer: replied 7 years ago.
Electric
Expert:  Mark Henley replied 7 years ago.

Hi,

 

OK , the relay in the unit is sticking. Are you OK with electrical work ?

 

Thanks

 

Mark

Customer: replied 7 years ago.
Yes. Where is the relay
Expert:  Mark Henley replied 7 years ago.

Hi,

 

Its inside the unit, you will have to follow the 24 volt circuit to one of the sequencers , the one that is on when this is happening and then replace that sequencer. Usually if this is the problem you can get it to shut off if you slap the side of the unit when its doing this, can you try that ? I know its not very scientific but it does work when this is the problem.

 

 

 

Thanks

 

Mark

Customer: replied 7 years ago.
I've tried that before and it doesn't work. Turning the breaker off is the only thing that will stop it from heating hotter and hotter
Expert:  Mark Henley replied 7 years ago.

Hi,

 

Have you tried replacing the sequencer / relay ?

 

Thanks

 

Mark