PROHEAT M-SERIES SERVICE MANUAL
3-39
e) Remove the fuse cover and using needle nose pliers or a fuse removal
tool remove the fuse.
If the fuse is blown, replace the fuse and check the PROHEAT current
draw. Go to page 3-27.
If the fuse is OK, the PCM is faulty. Go to PCM replacement.
PCM replacement:
a) Disconnect the Fuel Shut-off Valve and Ignition Module connectors at
the PCM.
b) Remove the blower housing (2) screws and blower housing.
c) Remove the blower retaining snap ring and slide the blower off the
Motor shaft.
d) Remove the Air Compressor filter.
e) Disconnect the Motor connector at the PCM. Remove the PCM.
f) Reinstall the new PCM following items 'e' back to 'a'.
g) Reconnect the burner head by mounting it against the heat exchanger
face, turning it clockwise to engage the mounting ears on the bolts.
h) Reconnect electrical harnesses and fuel supply line.
i) Switch the PROHEAT on and operate for at least one complete cycle.
Observe the operation.
Figure 3-46: PCM Replacement
BLOWER
BLOWER RETAINING SNAP RING
AIR COMPRESSOR FILTER
PCM
SCREWS (2)
TORQUE = 75 in-lbs
PCM MOTOR CONNECTION
LOCK
Figure 3-45: Connector Removal
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