Denso MOVINCOOL CLASSIC PLUS 26 - Manual (Page 27)

TROUBLESHOOTING AND REPAIR
19
Before troubleshooting the system, the following inspection should be performed.
1. Inspection of Power Source Voltage
Check the voltage of the power source.
Single phase 208/230 volts (60Hz)
Check the operation and condition of the fuse or circuit breaker in the power source.
2. Inspection of Air Filters
Remove the air filters and check the element. If the element is dirty, wash it as described in the OPERA-
TION MANUAL supplied with the unit.
3. Inspection of Drain Tank
Be sure tank is fully drained.
The following chart is provided as a guide for categorized problem remedies. Detailed information is
contained in the OPERATION MANUAL supplied with the unit.
4. Troubleshooting Chart
Trouble Probable Cause
Unit does not operate at all • Check for Power at
Receptacle
• Check for Power at Terminal
Board
• Check for Power at Relay
Board
• Check all wire connections
• Defective Drain Tank Switch
• Check Relay Board Fuse
• Defective Relay Board
• Defective Control Board
• High Pressure Switch
activated, disconnected,
defective
• Jumper on Relay Board (J8)
not installed correctly
• Defective Condensate Pump
(optional)
Unit starts, but stops immediately • Defective Fan Motor
• Defective Compressor Motor
• Defective Relay Board
• Room and Freeze Thermistor
connectors are reversed on
control board
Unit operates, but stops after a • Defective Compressor Motor
few minutes • Defective Fan Motor
• Drain Tank Full
• Fan Mode Switch is set to
“Stop” and compressor
cycled off
Water leakage from the unit • Drain Tank not installed
• Drain Tank is defective
(cracked)
• Drain Pan hole is obstructed
Abnormal noise and/or shaking • Loose Compressor mounting
nut
• Deformed or worn rubber
grommet on the compressor
mounting bolt
• Internal interference with
other components
• Damaged or out of balance
fan and scroll
Insufficient Air Flow • Fan mode switch on “Low”
• Defective fan motor
Trouble Probable Cause
Insufficient Air Flow (cont’d) • Clogged spine fins or
Evaporator or Condenser
(running unit without filter(s))
Insufficient Cooling • Environmental conditions
exceed design specifications
• Clogged air filter
• Clogged spine fins
• Set point temperature
exceeds room temperature
• Defective room temperature
thermistor
• Leak in refrigerant system
• Restriction in refrigerant
system
• Compressor not operating
Compressor not operating • Set point temperature
exceeds room temperature
• Unit is operating in Fan Only
Mode (Cool Mode not
activated)
• Jumper on Relay Board (J8)
not installed correctly
• Defective Condensate Pump
(optional)
• Defective Compressor
Capacitor
• Defective Thermistor
• Defective Compressor Motor
• Check wiring connections
• Defective Relay Board
• Defective Control Board
Fan Motor not operating • Fan mode switch is set to
“Stop” and current Set Point
Temperature exceeds Room
Temperature
• Fan mode switch is set to
“Stop” and unit has been
equipped with optional
Condensate Pump that is
defective
• Fan mode switch is set to
“Stop” and Jumper on Relay
Board (J8) is not installed
correctly
• Check wire connections
• Defective fan motor capacitor
• Defective fan motor
• Defective Relay Board
• Defective Control Board