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My RV heater duo therm only ignites when run on 120v When run on 12v fan runs but wont ignite I am wondering if the sail switch isn't closing?
My duo therm runs only on 12 volt power. When the RV is plugged in the converter is charging the battery to power anything on the 12 volt system. However, you need the full 12 volts to the furnace or it will not ignite. The fan needs to reach full speed for the sail switch to work and if you have low voltage it will run too slow. Check the volts with the fan running. It may be taking too much for the fan to operate and doesn't leave enough to ignite the furnace. You could also hook up a battery charger to the battery to make sure you have full power and try it. If that works then you have either a bad converter or a bad battery.
What else can I help you with?
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