MQp20p STaNDBY geNeRaTOR • OpeRaTiON aND paRTS MaNual — Rev. #1 (11/28/11) — page 39
trOubLEShOOtIng (COntrOLLEr)
Troubleshooting (MeC20 Controller) - continued
Symptom
possible problem
Solution
Engine temperature or oil
pressure display is reading
incorrectly
Improper calibration?
Verify that the controller's analog input has been properly
calibrated as per manual instructions.
Incorrect engine sensor wiring?
Verify that the engine sensor wiring is correct (Note: Use factory-
supplied engine sensors only.)
Battery not properly grounded?
Verify that the battery supply DC negative conductor is properly
grounded to the engine block (i.e. to a common ground point.)
Engine temperature or oil
displays "9999"
Incorrect wiring?
Check that the wiring from the controller terminal #37 and
#38 to the engine mounted sender is correct (i.e. wiring is
not open or shorted).
Incorrect resistance?
Verify that the engine mounter senders have correct
resistance reading for corresponding input temperature or
pressure (refer to Controller manual).
Improper calibration?
Verify calibration.
Engine alarms on high
engine temperature or low
oil pressure when engine
is operating within normal
limits
Incorrect wiring?
Check that the wiring from the controller terminal #37 and
#38 to the engine mounted sender is correct (i.e. wiring is
not open or shorted).
Incorrect resistance?
Verify that the engine mounter senders have correct
resistance reading for corresponding input temperature or
pressure (refer to Controller manual).
Keys on faceplate do not
operate.
Incorrect connection?
Verify that the interconnecting ribbon cable between the
faceplate and the main printed circuit board is connected
correctly.
