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The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
Fan doesn't run and no heat. If the fan will not start you should first check that your battery is good and you have 12 volts at the furnace. You could have a tripped circuit breaker or blown fuse. If the battery is good and you have electricity to the RV's heater next check the thermostat. If your thermostat only controls the furnace and has a switch to turn the furnace on/off, switch to ON position. If your thermostat controls the furnace and the air conditioner make sure the switch is set to FURNACE. â¢ Set thermostat to warm temperature and furnace blower should come on after 15-30 seconds.