G Series Outdoor Furnaces
www.heatmasterss.com
TROUBLESHOOTING
Electrical Troubleshooting
Electrical troubleshooting should always be done by a qualified technician
Damper Actuator:
The “mode” selector should be set to mode 3.
To test for proper operation the furnace should be powered on and calling for heat. The display
should indicate the desired Air Damper %. In this state you may test for power across terminals
1 & 2 on the actuator. There should be 24V DC across those terminals.
- To test for proper communication you may test the voltage across terminals 2 & 3. There
should be between 3 and 10V DC depending on the Air Damper % displayed on the control.
3 volts corresponding to 30%, 4 volts to 40%, and so on.
- If there is no power across terminals 1 & 2 then check that there is power at the Siemens
control. Test for power across terminal# 2 on output Q4 and terminal “M1” on the AM2 module.
- If there is power and communication to the damper actuator and it does not open or is
stopped in the wrong position pry the outer damper plate away from the inner plate. If the
plates have stuck or frozen to each other this should break them loose and the actuator
should move freely. If the plates were stuck they should be removed and cleaned.
- If the plates are not stuck or frozen and there is power and communication the actuator is
faulty and should be replaced.
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