what causes hvac breaker to trip when unit comes on?

Answer 1

bad circuit board or an overload

Answer 2

It is very possible that the hvac and air conditioner, furnace or other unit is on the same circuit. This will draw too much amperage and will trip the breaker. The other possibility is that the unit is shorting itself through a bad connection in the wiring from the power source to the unit itself. Check inside the where the wiring goes into the unit and see if there is a loose connection or there is burn marks around the wiring. If there is, than there is short and the arking is causing the breaker to trip. Call an electrician if you are not comfortable around electrical connections or turn the power switch off before checking any wiring. Good luck

Answer 3

there is a dead short somewhere in the HVAC unit itself. or the breaker being used for the HVAC is under rated amps Wise. It also could be a faulty breaker.
Your question did not explain the type of unit you have or the rating on the breaker or the unit itself, so it is hard to define a real good answer without these known. If this HVAC worked before on this same line, then I say it's the unit itself and call your HVAC company and have them send a Tech; to check it out. GOOD LUCK.

Answer 4

The breaker trips because too much amperage is being drawn on that circuit. Your a/c compressor may be going bad, or the furnace fan may have a bearing that needs lubrication. If the breaker is old, it could be getting weak.

Answer 5

Mine does that when,the outside,condenser fan doesnt come on,see if it does when someone turns it on.Another thing is let the unit cool for one hour and try it again,the compressor,has a high temperature switch on it to protect it.hope this helps!

Answer 6

too small of wiring gauge, too small of a breaker or its got a short somewhere

Answer 7

there could be a short somewhere in the circuit