4.5
TROUBLESHOOTING
SYMPTOM
POSSIBLE CAUSES
SOLUTION
System fault
Pump not primed properly
Bleed all trapped air from lines. Restart system.
Isolation valves may be closed
Open valves. Restart system.
Hose kinked or crushed
Remove obstruction. Restart system.
Leak in suction line
Repair leak. Restart system.
Oil pump motor turning
backwards
Reverse any two leads on power (in three-phase system).
Restart system.
See
SECTION 2.4.2
.
Control thermostat failure:
closed
Check and replace if necessary.
See
SECTION 4.2.6
.
Motor failure
Check and replace if necessary. Restart system.
Motor contactor failure
Check contacts and replace if needed. Restart system.
Motor protection switch
tripped
Check and reset switch. If problem occurs again, check
motor and check oil viscosity. Restart system. If oil is cold,
leave MPS off (or turn Oil Pump On/Off switch to off) until
heating system brings engine to optimal temperature.
Fluid temperature
too low
Motor failure
Check motor. Replace if necessary.
Heater has been turned off
and fluid is cold
Allow time for the heating system to heat fluid.
Heating element failed
Check elements for continuity. Replace element if
necessary.
Customer-supplied main
circuit breaker tripped
Check for element short to ground. If no short, reset
breaker.
Element contactor failed
Check contacts and coil. Replace if necessary.
Motor contactor failed
Check contacts and coil. Replace if necessary.
Control thermostat failure:
open
Check and replace if necessary.
See
SECTION 4.2.6
.
