8520-iv hydro series atwood furnace power to ignition control board verified, but control board diagnostic red fault
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Customer: 8520-iv hydro series atwood furnace power to ignition control board verified, but control board diagnostic red fault light will not light or flash fault code. could this be caused by failed sail switch or limit switch or thermostat.I already bought a replacement control board, with same result red fault light not illuminated nor flashing. viewing the ladder electical diagram it appears sail switch failure or limit switch failure may disable fault light????
Answered by Robert in 30 mins 11 years ago
Robert
12+ years of experience
37,702 satisfied customers
Specialities include: Auto Body Technician, Heavy Equipment Repairs, Heavy Duty Engine Repairs, Brake and Transmission Repairs
Hi There!
Thanks for Choosing Just Answer,
You are on the right track with this, the control board will not receive power until it goes through the sail switch and High limit switch. As the blower comes up to speed it closes the sail switch and sends power to the board via the high limit switch. IF the fan is not spinning fast enough it will not close the sail switch so make sure you have good DC voltage and none of the vents inside are being blocked. Many times you will see a flashing 1 for a limit switch if it starts and shuts down. These are a little difficult to access, most times the blower motor needs to be pulled to get to the limit switch.
Robert
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BackRobert
37,702 satisfied customers
12+ years of experience
Robert
12+ years of experience
37,702 satisfied customers
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