P26 Clutch Connection Error
Error detection method
A clutch connection failure will be recognized as abnormality only when it occurs 5 times due to the
following main cause.
・The revolution speed does not slow down and the high and low differential pressures of refrigerant
circuit remains unchanged for 3 minutes while the clutches are in the on-state during complete
combustion of the engine.
Troubleshooting
1
Clutch
1-1
Does each clutch operate normally?
* Continue to operate the air conditioner for enough time
(approx. 10 to 20 minutes) until the clutches come into
the on-state, under enough air conditioning load (test run
mode and so on).
Yes 5-1
No 2-1
2
Wiring
2-1 Check the conductivity of wiring in the malfunctioning clutch.
Yes 2-2
No Repair wiring
2-2
Check the poor contact in wiring of the malfunctioning
clutch.
Yes 3-1
No Repair wiring
3
Board
3-1
Check if DC voltage (about 12V) is applied between No.1
pin and No.4 pin of the connector CN019 (7P: white) on the
main board in the outdoor unit.
Yes 4-1
No
Replace the main board in
the outdoor unit.
4
Electric
component
4-1
Does the relay (RY004) on the power board in the outdoor
unit operate normally? (Check the sound of relay operation.)
Yes 5-1
No
Replace the power board
in the outdoor unit.
5
Compressor
5-1
Is the compressor defective?
* The compressor is considered to be normal if the
differential pressure of the refrigerant circuit becomes
larger (increase in high pressure and decrease in low
pressure) after the clutches have come into the on-state.
Yes Replace the compressor.
No Keep it under observation.
● For board and Electrical Wiring Diagram, see Chapter 6.
CL (Clutch)
CL2 (Clutch 2)
(U-30GE2E5 only)
2
1
IV–103
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