PROHEAT M-SERIES SERVICE MANUAL
3-21
g) Place a finger over the sensor port located on the burner head flange.
The indicator light should go out. Remove your finger and shine a
flashlight into the sensor, the indicator light should come on.
If the indicator light reacts correctly, the Flame Sensor is OK. Go to Test
Procedure – Combustion Tube orientation.
If the indicator light does not react, the Flame Sensor is faulty. Go to
PCM replacement, page 3-39.
Test Procedure – Combustion Tube orientation:
a) Ensure that the combustion tube orientation boss is aligned with the
heat exchanger flange notch.
Figure 3-25: Combustion Tube Orientation
ORIENTATION BOSS
HEAT EXCHANGER FLANGE NOTCH
MOUNTING BOLTS
TORQUE = 100 in-lbs
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