SAIL SWITCH VOLTAGE CHECK
Hoping for help on troubleshooting a Furnace Sail Switch. Furnace was intermittently failing and now progressively worse. Blower would come on and after about 30 seconds would shut off - no audible at...
Forum Discussion
Current Furnace Boards can "see" a fault in the Sail switch. If you have leaked 2 volts, the circuit board will sense this and not operate correctly. A defective Sail switch is very difficult to determine on newer Furnace's due to this. Furnace Circuit boards rarely fail. People NEVER understand this. They replace a circuit board and the furnace then operates and they think they found the problem, BUT, when you mess with the furnace you may be touching/jarring a defective marginal part and the furnace operates and you think the CB was the answer. There is a current thread on a 2/3 year old Atwood where the RV'er replaced the CB last year and now is experiancing the same type problem and thinks it is the CB. Probably a bad sail switch from the symptoms he lists. When you have failure of fan motor or ignition sequence, replace the CHEAP sail switch first. Doug
