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Re: the contactor well not pull in.
Also if it where the circuit board that had gone bad. Your furnace would not turn on at all not even the blower motor. You can test them both by looking for 24 volts to the board, and 120 volts per leg of the contactor
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Look at the inside of the cover on the furnace and it will tell you what's the code mean.
I think because was calling for Ac that's why you are having that blinking red light.
Turn furnace off on switch and turn it back on and that should clear error code .
To check your air conditioning unit that's the unit that's outside .
Check to see if contactor is pulled in .if it is and nothing is running then check the capicator. The capicator is the oval metal thing that's tuck next to the capicator with 3 wires attached to it .
If it bulky then it's bad .
That is the most common issue with these unit.
YELLOW IS COOL GOES TO THE CONDENSING UNITS CONTACTOR WITH SOMETIMES MAKING A CONNECTION ON THE FURNACES LOW VOLTAGE TERMINAL BOARD, LVTB, BUT IT NEED NOT, AS IT DOE NOTHING HERE, IT DOES OUTSIDE WITH THE 24V COMMON OR NEUTRAL LEG OF 24 V POWER. GREEN IS FAN/HIGH/COOL SPEED AND GOES TO GREEN ON THE FURNACES LVTB. COMMON IS THE 24 VOLT NEUTRAL AND WHERE EVERY CIRCUIT TERMINATES OR ENDS TO COMPLETE THE CIRCUIT.
Hello my name is Heath it will be my pleasure to assist you. First thing to do is go to the furnace take off the lower blower door and locate the circuit board turn the power off to the furnace. In the circuit board there should ba a small car like fuse usually 3 or 5 amps check the fuse it is probably blown replace the fuse with the same amperage fuse and then turn the power back on on the furnace and check the operation of the furnace.
If the contactor won't pull in the first thing to check is the low voltage circuit to the contactor. Is there 24v going to the contactor? If yes and the contactor is not pulling in, then you have a bad or dirty contactor. I have often time seen bugs get in between the contacts and stop the flow of electricity. If there is not 24v being supplied to the contactor then you will have to check your thermostat and the wiring from the furnace to the outdoor unit. Hope this helps
Sounds like you might have a low voltage short possibly at contactor at outside unit (Condenser).
What happens is if your contactor has a short it will pop a 3 or 5 amp fuse at the furnace circuit board. This fuse will continue to pop until the short is fixed the best way I have found is to take off all low voltage wiring at furnace circuit board put them back one by one first with R then W then G then Y if it pops at Y your contactor has to be replaced.
Remove the cover on the outside unit that covers the circuit board and contactor and capacitor. Then start the unit and set the thermostat so that the unit cuts off. Then go back to the outside unit and see if the contactor is still pulled in and the unit is running. Next open the breaker and see if the contactor drops out. If it doesn't your contactor could be stuck. Try to free it or replace it. If not the problem could be in the circuit board.
your thermostat powers 'Y' for cooling. That in your case blue wire connects to 'Y' on the control board in the furnace. Then a pair of low-voltage wires connects 'Y' and 'C' on the furnace to the two wires to the coil of the contactor in the a/c condensing unit. So to follow the path, the signal wire from the thermostat sends 24v down the Y wire to the furnace board Y terminal which also connects to one side of the contactor coil in the air conditioner. To complete the control circuit to the air conditioner there has to be a common wire. This is connecting the C wire from the furnace board to the other side of the contactor in the air conditioner. Hope this helps.
If the contactor will not pull in then the contactor is bad and needs to be replaced. They operate off of a small electrical pulse and they are made mostly of plastic so when then go bad they get stuck very easily and it is a fairly common problem
99% of the time proves to be a short- in the thermostat, furnace, condenser, or the 24V wires between them. Time to get out an ohm meter and check continuity between the wires and between each wire and ground - detective work - can be fun!?
Much less likely: condenser contactor, furnace control board, other condenser controls any of which could be drawing too much current. I bet on a short curcuit but if not I'd try changing the contactor first I think.