PROHEAT M-SERIES SERVICE MANUAL
3-18
Ignition Module – Check:
a) Ignition Operation using Ignition mode.
b) Ignition Module and PCM – electrical open circuit fault.
Test Procedure – Ignition service diagnostic:
a) Disconnect all harnesses at the PCM.
b) Disconnect the fuel supply line.
c) Loosen and back out the burner head mounting (2) bolts five to six turns
allowing enough room to rotate the burner head 15° counter-clockwise
and remove.
d) Check Electrodes for carbon bridging and/or damage. Replace if necessary.
e) Reconnect the power and switch harnesses.
f) Switch the PROHEAT on and observe for a spark. Spark will continue for
five seconds.
If the spark is OK, reinstall the burner head and review Fuel System
troubleshooting, page 3-3.
If there is no spark check PCM ignition output voltage.
Test Procedure – PCM ignition output voltage:
a) Disconnect the Ignition Module and the Fuel Shut-off Valve connectors
(ensure no flow) at the PCM.
b) Reconnect all external harnesses at the PCM.
START: Ignition System
(1 Flash)
WARNING
Shock hazard due to high voltage.
WARNING
Do not connect Temperature
Sensor to avoid flame.
WARNING
Keep blower housing on to avoid
injury when Motor starts up.
Figure 3-19: Burner Head Removal and Ignition Electrode Removal
MOUNTING EARS (2)
MOUNTING BOLTS (2)
TORQUE = 100 in-lbs
COOLANT PUMP
SWITCH INPUT
TEMP SENSOR 1
POWER
FUEL INLET
5/32" (4mm)
17/32" (13.5mm)
9/16" (14mm)
45°
IGNITION ELECRODE
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