Furnace Control Board Fuse

Cartridge fuse flat blade dual element time delay class rk5 250vac 125vdc 200a 7 1 8 l 1 9 16 dia.

Furnace control board fuse.

The guy has a new condensing unit installed last year. Electric furnace thermostat control wire. Electric furnace problems can be frustrating especially when they come at the worst time. Can you guys point me in right direction to figure this one out.

Here s how to diagnose a low voltage short. Is your air conditioner or furnace not turning on or p. 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. Its just being used for cooling right now.

If you have a gas furnace one of the valves may be failing. When a valve is unable to open and close properly it can sometimes heat up causing an electrical short that blows a fuse. 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.

Diyers often try and handle things on their own. I turned off the input power and attached terminal r 24 vac power to thermostat and the fuse blew. Do you suspect that your furnace ac control board is bad. I replaced the original control board with a honeywell st9120u1011 universal control board about two years ago after the original one blew.

I removed all the wires going to my thermostat and it would not blow the fuse when powered on. I did a recent service call and the 5 amp fuse in the circuit board on the furnace was blown. Your furnace s control board has a separate fuse that protects it from getting too hot. If the fuse keeps popping in your air conditioner you have a 24 volt short.

Every troubleshooting tip i found said to disconnect the w heat relay and r 24v supply terminals from the thermostat and jumper them on the control board. He just called and told me fuse is blown again. 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. Should i check amp draw on compressor and both fan motors.

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 or ac control board troubleshooting.