Proheat M125 - Manual (Page 72)

4-35 PROHEAT M-SERIES G-II PCM SERVICE MANUAL
4.1.16
(15 Flashes)
INDICATOR OUTPUT Diagnostic Code 15
Indicates a short circuit fault (current draw greater than 1 Amp) in the harness
or the device being operated by the Indicator Output.
Troubleshoot the Indicator Output diagnostic code based on:
Electrical indicator output circuit in the switch wiring.
Test Procedure – Electrical, short circuit:
a) Remove the existing switch harness at the G-II PCM.
b) Remote start the PROHEAT using the PROHEAT remote start switch
(PROHEAT P/N PK0091).
If the PROHEAT functions correctly, the fault is in the wiring from the
PROHEAT back to the switch indicator light. See OEM recommended
service requirements.
If the INDICATOR OUTPUT Diagnostic Code 15 is still indicated, the G-II
PCM is faulty. Go to G-II PCM replacement, page 4-38.
4.1.18
(17 Flashes)
MOTOR SPEED SENSOR Diagnostic Code 17
Indicates the motor RPM signal has not been detected for 5 seconds while
normal (less than 12 Amps) current is flowing through the motor.
Troubleshoot the Motor Speed Sensor code based on:
a) Inspect the Combustion Air Blower magnet for damage.
b) Motor mechanical function. Go to page 4-32 and perform
Test Procedure – Motor mechanical function.
If the Motor Speed Sensor Diagnostic Code 15 is still indicated, the G-II
PCM is faulty. Go to G-II PCM replacement, page 4-38.
4.1.19
(18 Flashes)
CANbus ERROR Diagnostic Code 18
Indicates the heater was switched on via a CANbus input and then lost the
CANbus heartbeat message for longer than 5 seconds.
The heater will go to the cool down (purge) mode then turn off until valid CAN
communication is restored.
If the Diagnostic Code 18 is still indicated please contact Proheat for further
information.
4.1.17
(16 Flashes)
SYSTEM CURRENT Diagnostic Code 16
Indicates the total system current limit of 25 Amps was reached as measured
by the G-II PCM.
NOTE In an attempt to lower the system current, the auxiliary output is turned
off for the remainder of the current cycle.
Troubleshoot the System Current diagnostic code based on voltage: page 4-26.