Furnace Board
Goodman electric furnace circuit board problem.?
I recently replaced the circuit board on the electric furnace. I hooked up exactly the same way I disconnected it. Now the 3 amp fuse blows every time I attempt to start it. No wires are crossed; I traced every wire and its hooked up exactly like the schematic says. Could some one please help me out. Im beginning to believe that I bought a faulty board.
Your 3 amp fuse is tied into the low voltage (24 volt) circuit to protect the transformer from burning out in the event of a "direct short" - so here's what you can do to rule out that you do not have thermostat wires grounded.
Disconnect (ALL) the THERMOSTAT wires AT THE BOARD then use a jumper wire to initiate a call for heating, cooling or blower operation. 24 volts "R" to "W" or "W1" will activate your HEAT. "R" to "Y" or "Y1" will activate COOLING. And "R" to "G" will activate the BLOWER motor. What ever you do, DO NOT jumper "R" to "C" because that'll pop the 3 amp fuse!
If after jumping all these terminals and the fuse DOES NOT blow then the problem is in your thermostat wiring somewhere. If the fuse does blow again, then there is a direct short somewhere in the unit. Remember to recheck all your LOW VOLTAGE SAFETY CIRCUITS AS WELL. THEY SHOULD ALL BE IN "SERIES".
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HVAC Troubleshooting a gas furnace control board and blower motor.
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