10
Troubleshooting S1505
6. Gas valves are energized, and spark is initiated:
1) If gas valves do not open then check each gas valve individually
a) If there is power between the wires leading to the gas valve, then the gas valve is
faulty
b) If there is no power at terminal V1 of the Fenwall module 2 seconds after start-up, but
there is power at terminal L1 of the Fenwall then the Fenwall module is faulty.
c) If there is no power at terminal L1 of the Fenwall module then check the following
components using the previously mentioned tests for the limit switch, the airswitch and
control relay #2.
2) If there is no spark then check:
a) The spark plug, gap should be at least 1/8”
b) If ignition wire is burnt or if it is grounding out to the heater.
c) If there is power at terminal L1, and no power at terminal V1 of the Fenwall then the
Fenwall module is faulty.
7) Flame rod senses and maintains flame, if not check:
a) If flame rod wire is connected to flame rod and not grounding out to the heater
b) If flame rod wire is inserted into the correct location on the Fenwall module
c) The flame rod must always be screwed into the burner securely. The probe part should not
be touching the burner in any way thus grounding out.
d) If the flame is too short and flame rod is not bright orange color, then check if there is
adequate manifold gas pressure.
e) If above checks are all good then the Fenwall module is defective.
8) Set thermostat to desired temperature, heater will cycle from low to high flame, if not:
a) If there is no power at the thermostat then the start switch is faulty
b) If there is no power at the high flame side of the 2 stage regulator then the thermostat is
faulty
c) If there is power at the high flame side of the 2 stage regulator then the valve is faulty.
