Furnace Control Board Fuse

If the fuse blows when you have no low voltage wires hooked to the furnace then you have an internal problem like a bad limit gas valve connection or control board.

Furnace control board fuse.

Here s how to diagnose a low voltage short. Its just being used for cooling right now. If the fuse didn t blow it meant the. Diyers often try and handle things on their own.

I replaced the original control board with a honeywell st9120u1011 universal control board about two years ago after the original one blew. Should i check amp draw on compressor and both fan motors. I turned off the input power and attached terminal r 24 vac power to thermostat and the fuse blew. I was blowing the 5 amp fuse on the control board for my forced air gas furnace.

I did a recent service call and the 5 amp fuse in the circuit board on the furnace was blown. Is your air conditioner or furnace not turning on or p. I removed all the wires going to my thermostat and it would not blow the fuse when powered on. It isn t the hsi inducer or blower motor as these are all high voltage parts not low voltage.

My furnace is a concord model cg90ub. Cartridge fuse flat blade dual element time delay class rk5 250vac 125vdc 200a 7 1 8 l 1 9 16 dia. Electric furnace thermostat control wire. Do you suspect that your furnace ac control board is bad.

Furnace or ac control board troubleshooting. This will blow the fuse on the control board causing the draft inducer to not start which then stops the rest of the furnace functions from working properly. When a valve is unable to open and close properly it can sometimes heat up causing an electrical short that blows a fuse. If the fuse keeps popping in your air conditioner you have a 24 volt short.

Can you guys point me in right direction to figure this one out. Sometimes your furnace may seem like it has blown a fuse but it is actually suffering from loose wire connections. Electric furnace problems can be frustrating especially when they come at the worst time. Your furnace s control board has a separate fuse that protects it from getting too hot.

The guy has a new condensing unit installed last year. If someone pokes around your furnace and isn t careful they may loosen wires from the furnace s wire frame causing them to short and blow a fuse on the control board.