Re: Furnace Blower Fan Cycles On/Off During the off Cycle

So if I wanted to test the limit switch B13701-55 I run a wire/jumper from one terminal to the other, basically connecting them? If issues is resolved replace switch if not replace board?

Re: Furnace Blower Fan Cycles On/Off During the off Cycle

I have the same basic issue but, it is a GMP075-3 unit. Had a tech look at it and was told most likely it is the B13701-55 Limit switch that is causing the issue. Any suggestions, should I start there or start with the PC board. Note: the unit is in saltwater coastal environment and is what lead me to lean towards the limit switch because of possible corrosion. The turn on and offs of the fan are completely random, two minutes one time shut down and start up the next minute and might be 30 minutes and then run for 15, this...