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Correct 12 VDC
source to mode
selection switch.
Is 12 VDC
present at
output of 1
amp fuse?
NO
YES
Replace 1
amp fuse.
Is 12 VDC
present at
input of 1
amp fuse?
NO
YES
Correct 12 VDC
source to fuse.
Is the mode
selection in the
Gas position?
NO
YES
Set mode
selection switch
to gas.
Correct 12 VDC
source to fan
thermostat.
Replace mode
selection switch.
Is 12 VDC
present at
fan thermostat?
NO
YES
Connect the
two wires
together.
Does fan
operate?
NO
YES
Disconnect red
wire from mode
selection switch
to thermostat.
YES
Replace
thermostat.
Disconnect red
wire from fan
to thermostat.
Replace
fan.
Is 12 VDC
present at
input of mode
selection switch?
NO
YES
Is 12 VDC
present at
output of mode
selection switch?
NO
Trouble Shooting - Ventilation Fan
Specifications
DC Volta
g
e: 12 VDC Current Draw: .240 milliamps
18