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teambeeson's avatar
teambeeson
Explorer
Jun 23, 2016

Duo Therm Furnace - lower voltage that triggers blower?

Hi. 1986 truck camper and it has a "Duo Therm 661 2-006" gas furnace, which works awesome when the camper is plugged in, but when I'm on battery the main blower/burner won't trigger except on a 100% t...
Truck Campers
kohldad's avatar
kohldad
Explorer III
Jun 23, 2016
If the sail isn't going up enough than the blower isn't turning fast enough which could be low voltage, bearings going bad, or motor going out. Read the voltages while the furnace is running as that will show the bad contacts. The furnace should work down to a loaded battery voltage of around 11.0 - 11.5V.

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