Most common is LOW BATTERY= slower fan= SAIL SWITCH (safety) opens and shuts off gas solenoid, (to prevent Overheat), but leaves fan running; usually after 5-7-hours, depending on outside temp and how much furnace ran. With 25-deg outside, mine was closer to 5-hrs, would crank GEN, sometimes had to BOOST to start GEN.
Most common is LOW BATTERY= slower fan= SAIL SWITCH (safety) opens and shuts off gas solenoid, (to prevent Overheat), but leaves fan running; usually after 5-7-hours, depending on outside temp and how much furnace ran. With 25-deg outside, mine was closer to 5-hrs, would crank GEN, sometimes had to BOOST to start GEN.
I've had this problem a few times with my 2018 264 BHW. What I did was to run the thermostat to its lowest setting and let it sit until I hear a 'click' indicative of someting resetting in the control circuit.
I then run the thermostat up to a high setting and the furnace heating element lights off.
Being technically oriented I have to stop myself from digging too deep at first and go back the the basics. Saves me a lot of tail chasing.
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LEO retired (27 years)
USN 1972-76
Our sail switch tends to get bent out of shape. If I bend to orignial shape the heater works fine. I have had the heater out twice to fix the sail switch. It is a big job.
__________________ 2014 Ram 1500 Outdoorsman|2016 Jayco 24 RKS Me, wife with our rather large puppies|Miles-goldendoodle| Merlin-53% yellowlab/ 47% mix
Yes and no, SAIL switch directly controls gas valve, PREVENTS OVERHEAT Vs high-limit REACTS TO OVERHEAT.
Well, sail switch controls gas, nothing to do with high heat. If the high limit switch doesn’t work then the sail switch will keep the gas going. It will not cut off the gas unless the fan slows down slow enough to trigger the sail switch.
Linear Mode
