Proheat M125 - Manual (Page 41)

4.1.1 EXAMPLE PROHEAT BEHAVIOR ERROR – CODE 1
The following is an example of M-Series PROHEAT behavior during an fault
condition. The following example shows the sequence of events when the
PROHEAT is switched “ON” in the Standard Mode (a similar sequence of
events occurs for Preheat and Supplemental Modes).
The ON/OFF switch lamp, timer lamp or OEM indicator (installation options)
will light. If the coolant temperature is below 160°F (71°C) the PROHEAT
enters Pre-check. If the coolant temperature is above 160°F (71°C) the
PROHEAT enters Standby.
1. Switch “ON”
Standard
Mode Signal
GREEN
The G-II PCM performs self diagnosis checking sensors for correct range,
electrical components for over-load and for a flame presence. Also during the
first Precheck, the Ignition Module sparks for five seconds to allow a service
technician to visually check for a spark. If there are no faults indicated, the
PROHEAT goes to Ignition.
2. Precheck
GREEN
The Motor and Coolant Pump start first, followed by the ignition spark, and then
Fuel Solenoid Valve opens. The Ignition Module sparks for up to 30 seconds
during which time the flame sensor must detect a proper flame.
• In this error example, the PROHEAT does not detect proper flame during the
30 second ignition period and the PROHEAT enters Fault Detection – Cool
Down (Purge).
3. Ignition
GREEN
The PROHEAT always restarts after one error detection(with the exception of
Code 4 overheat). After the 3 minute Cool Down (Purge), the PROHEAT will go
through Precheck, Ignition and the Fault Detection – Cool Down (Purge)
cycle one more time.
5. Steps 2 to 4
are Repeated GREEN
After two consecutive Code 1 errors, the PROHEAT goes into a Fault Shut
Down state. No further start attempts will be made.
The G-II PCM Status Light and the ON/OFF switch lamp, timer lamp or OEM
indicator light will continue to flash once, pause and repeat.
NOTE: In order to restart the heater, turn the switch “OFF” and back “ON”.
6. Fault Shut
Down RED
The flame sensor did not “see” a flame within 30 seconds after entering
ignition: the fuel solenoid closes and the Motor and Coolant Pump continue
to operate for three minutes.
Code 01 will flash on the G-II PCM Status Light and the ON/OFF switch lamp,
timer lamp or OEM indicator (installation options). There will be one flash,
pause and then one flash repeating on the G-II PCM Status Light and the
ON/OFF switch lamp, timer lamp or OEM indicator. After 3 minutes, the Motor
and Coolant Pump stops and the PROHEAT attempts to start again.
4. Fault
Detection –
Cool Down
(Purge)
RED
4-4 PROHEAT M-SERIES G-II PCM SERVICE MANUAL