Came home from work to find that my circut breaker was tripped for my furnace...what and why caused this...i flipped the breaker back on and smelled like it fried the control board....why did it do this

Pump is working but no power to heater may be caused by
the two circuit breakers that protect the electrical circuits providing power to the air handler and heat pump condenser may have tripped Check both the main electrical panel and any sub panels that supply power to the unit. If a circuit breaker has tripped, reset it by flipping it to OFF and then to ON.
If the circuit breaker trips again, there is probably a short in the electrical system providing power to the furnace. Call an electrical contractor

Depending on age of home you may have a spark arrestor circut.
if you used incandescent bulb and it failed ( reason you changed ) it could have trip this circut breaker on main panel ( usually will have green toggle ). Turn breaker to full off then turn back on.

see this causes and fix it. God bless you
If the furnace won't run, check the electrical service panel for a blown fuse or tripped breaker. Also make sure the power switch on or near the furnace is turned on. Check the unit for a reset button and try it. Some units have a built-in breaker or fuse panel.
However you can have a missing 1 phase , test with the VOM, for to measure voltage. Or motor need repair for winding trouble,bearing.If you do not have enough experience call some electrician.
God bless you

Disconnect the black power wire where it is connected to the furnace with breaker off. Put a wire nut on it and then turn the breaker on. If it continues to trip, the problem is not the furnace and you will have to trace the power wire back to the breaker box to find problem. Next, disconnect the black wire from the breaker (with breaker off) and then snap breaker on. If it trips, bad breaker. If the furnace was disconnected and breaker did not trip, you have a short either on the P C Board or the transformer.

Circut breakers trip due to a short circut or an overload. In this case the likely cause is an overload. If your compressor is drawing more amperage than the breaker is designed to allow, the breaker trips for safety. Possible solutions. Try using a different outlet with fewer appliances or tools on that circut. If the outlet you are using is on a circut that also has lighting, appliances etc, each item is drawing amps, the addition of the compressor to the circut is pushing the amp limit over the top. You can also try a heavier duty extension cord. If you are using an extension that is rated too low for the required amperage your breaker will trip. If you are not using an extiension cord you may need to talk to an electrician about adding another circut to service your tool and garage needs.
Another possiblity is that your service is not upgraded enough. If you have a 60amp service for the house you might want to talk to an electrician about upgrading to 100amp or more.

The magnetron will not cause it to trip the breaker. Shorted High Voltage capacitor, or transformer, or bad door switches more likely at fault.

Hello,If just installed the thermostat check that the wires are not touching anywhere.If not the case you have a open(tripped) HIGH LIMIT at the furnace and the blower will continue to run untill it is reset.

First HACR is heating, air conditioning,refrigeration. So in other words you could use it on an electric furnace or air conditioning.
IS this the main breaker for the panel? or for and electric furnace. I'm assuming its for the furnace, perhaps back up heat for heat pump. See if there is another disconenct on the furnace, turn it off and see if the breaker resets. IF so you have a short or overload in the furnace.
If' it IS the main for the panel, turn off all the other breakers in the panel, and try to reset the breaker. If that works, turn the other breakers back on one at a time. IF it "POPS" then it is tripping. Don't keep resetting, find the problem.

there is a thermo-sensor switch next to the circuit board that tells the fan switch to turn on when the plenum is hot enough. this needs to be replaced.