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Troubleshooting chart
PROBLEM
1.
Main power switch open.
2.
Unit system switch open.
3.
Circuit switch in pump-down position.
4.
Evaporator flow switch not closed.
5.
Circuit breakers open.
6.
Fuse blown or circuit breakers tripped.
Compressor will
7.
Unit phase voltage monitor not satisfied.
not run
8.
Compressor overload tripped.
9.
Defective compressor contactor or
contactor coil.
10. System shut down by safety devices.
11. No cooling required.
12. Motor electrical trouble.
13. Loose wiring.
1.
Low voltage during high load condition.
Compressor
Overload Relay
2.
Loose power wiring.
Tripped or
3.
Power line fault causing unbalanced
Circuit Breaker
voltage.
Trip or Fuses
4.
Defective or grounded wiring in the motor.
Blown
5.
High discharge pressure.
Compressor
1.
Compressor internal problem.
noisy or
2.
Oil injection not adequate.
vibrating
Compressor will
1.
Defective capacity control.
not load or
2.
Unloader mechanism defective.
unload
3.
Control solenoids defective.
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
1.
Close switch.
2.
Check unit status on Control Panel. Close
switch.
3.
Check circuit status on Control Panel.
Close switch.
4.
Check unit status on Control Panel. Close
switch.
5.
Close circuit breakers.
6.
Check electrical circuits and motor
windings for shorts or grounds.
Investigate for possible overloading.
Check for loose or corroded connections.
Reset breakers or replace fuses after fault
is corrected.
7.
Check unit power wiring to unit for correct
phasing. Check voltage.
8.
Overloads are manual reset. Reset
overload at button on overload.
Clear alarm on Microprocessor.
9.
Check wiring. Repair or replace contactor.
10. Determine type and cause of shutdown
and correct problem before attempting to
restart.
11. Check control settings. Wait until unit calls
for cooling.
12. See 6, 7, 8 above.
13. Check circuits for voltage at required
points. Tighten all power wiring terminals.
1.
Check supply voltage for excessive
voltage drop.
2.
Check and tighten all connections.
3.
Check supply voltage.
4.
Check motor and Replace if defective.
5.
See Corrective steps for high discharge
pressure.
1.
Contact DAIKIN.
2.
Contact DAIKIN.
1.
See capacity control section.
2.
Replace.
3.
Replace.
D - KIMAC00512-09EN - 37/40
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