Start Diagnostic Code - Proheat M80 Service Manual

PROHEAT M-SERIES SERVICE MANUAL
3.1.1

START Diagnostic Code

(1 Flash) Indicates that the PCM Flame Sensor did not detect a flame or the flame was
too weak to be detected during the FULL ignition period (M50/M80/M105 –
30 second ignition period).
Troubleshoot the Start diagnostic code based on the following symptoms:
1. Fuel System.
a) There is no fuel, fuel odor or atomized fuel coming from the exhaust pipe.
b) There is no hot exhaust coming from the exhaust pipe.
2. Ignition System.
a) There is raw fuel and/or atomized fuel and a raw fuel odor coming
from the exhaust pipe.
b) There is no hot exhaust coming from the exhaust pipe.
3. PCM (PROHEAT Control Module) Flame Sensor circuit.
a) There is a flame and the combustion sounds good, the PROHEAT
appears to be operating normally.
b) No smoke, raw fuel odor or atomized fuel is coming from the
exhaust pipe.
4. Motor and/or PCM fault.
a) The Motor is NOT running. Ignition and Coolant Pump are operating.
b) No smoke, raw fuel odor or atomized fuel coming from the exhaust pipe.
Go to page 3-4 to 3-15, Steps 1 through 7.
Go to page 3-18.
Go to page 3-22.
Go to page 3-20.
3-3