MovinCool CM12 Service Manual - Manual (Page 39)

Repair Section
39
7.3 Troubleshooting Chart
• To accurately troubleshooting the problem, it is important to carefully confirm the nature of the
problem. Common problems are:
- Insufficient cooling.
- Unit does not operate.
- Overflow of drain water.
- Abnormal noise or vibrations.
- Others.
(1) Unit does not operate or stops operation
Condition
Alarm
Pattern
Check Area Possible Cause Remedy
Unit does
not operate. Voltage Power failure. Repair power supply.
Turn the circuit breaker on.
Ground fault breaker
trip Ground fault or defective
ground fault. Repair ground fault section.
Reset or repair circuit breaker.
Fuse Fuse is blown. Replace fuse on the relay board.
Wall thermostat Incorrect connection. Connect the wires correctly.
Battery depleted by the
thermostat. Change battery.
Override (Stop) switch Override (Stop) switch is in the
STOP position. Turn the override (stop) switch to
OPERATE.
High pressure switch Dust buildup on the surface of
the condenser air inlet. Remove dust with a vacuum cleaner.
Loose high pressure switch
connection. Reconnect the high pressure switch
and check the connection.
Defective high pressure switch
(short or open). Replace high pressure switch.
Operating outside of the
operating temperature range. Check environmental condition. Do
not operate the unit outside the
operating condition range. (See page
12.)
Refrigerant is over charged
in the field. Charge the correct amount of
refrigerant. (See page 69.)
1 Thermistor Defective thermistor
(short or open). Replace thermistor.
Loose thermistor connection. Reconnect the thermistor and check
the connection.