PROHEAT M-SERIES SERVICE MANUAL
3-2
3.1 SYSTEM AND COMPONENT
DIAGNOSTICS
The PCM continually monitors the PROHEAT operating conditions. If the PCM
detects a problem, the indicator light flashes a diagnostic code(s).
The diagnostic indicator light may be located:
• In the toggle of the ON/OFF Switch provided by PROHEAT (standard
installation kit).
• In the PROHEAT Timer manual ON light (red).
• In an OEM indicator light package.
• In the remote switch (PROHEAT P/N PK0091) used for troubleshooting.
NO. OF FLASHES DIAGNOSTIC CODE DESCRIPTION PAGE
1 Start 3-3
2 Flame Out 3-24
3 Coolant Flow 3-25
4 Overheat 3-27
5 Voltage 3-27
6 Flame Fault 3-29
7 Temperature Sensor T1 3-29
8 Fuel Shut-off Valve 3-31
9 Temperature Sensor T2 3-32
10 Ignition Module 3-32
11 Coolant Pump 3-33
12 Motor 3-34
13 Auxiliary Output 3-35
14 Switch Output 3-36
SYSTEM
DIAGNOSTICS
COMPONENT
DIAGNOSTICS
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