Quote:
Originally Posted by drjzimm
Atwood 32830 in a 2017 Thor Quantum Class C. I have replaced the sail switch three times, but when I test across the contacts, with the furnace blower running, but no gas, it doesn't seem to have enough force to push and thereby open the sail switch. Do I need a new blower motor? Should I bag that kind of hassle and try to replace the entire furnace? And thoughts would be appreciated!
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Hi drjzimm- The sail switch is part of the ignition sequence, NOT part of the blower that runs the warm air into the coach. The sequence is like this;
1) you turn on the heater (call for heat)
2) The blower motor turns on. This is a dual purpose motor because it runs the house air into the coach and the ignition induction fan that clears the fire box of any fumes and starts the fire box draft process
3) If the motor is working properly, the sail switch closes starting the ignition process
4) If the high limit switch is closed (good switch), the igniter will start to click to light the main burner, the main burner will then light
5) At this point the coach should start heating.
So, you mentioned that you hear the blower but the unit doesn't start to heat. Are you getting 12v on both sides of the switch when you have it turned on? A second thing to check is the over limit (overheat) switch. These are in the same circuit as the sail switch. follow the wire from the sail switch which should lead you to another type switch with two wires. it's a disc like heat sensor. They are normally closed so if you disconnect one wire with the power off, use an ohm meter and check for continuity. If none, that switch is bad and the problem. If its good, then we move on to the igniter board. On that board there may be a fuse that you can check, if not, my guess is that you may then have a bad igniter board. Give these suggestions a try and report back if you can! I hope this helps.
Good Luck!
Atwood Furnace with not enough blower force
Linear Mode
