P26 Clutch Connection ErrorError detection methodA clutch connection failure will be recognized as abnormality only when it occurs 5 times due to thefollowing main cause.・The revolution speed does not slow down and the high and low differential pressures of refrigerantcircuit remains unchanged for 3 minutes while the clutches are in the on-state during completecombustion of the engine.Troubleshooting1Clutch1-1Does each clutch operate normally?* Continue to operate the air conditioner for enough time(approx. 10 to 20 minutes) until the clutches come intothe on-state, under enough air conditioning load (test runmode and so on).Yes 5-1No 2-12Wiring 2-1 Check the conductivity of wiring in the malfunctioning clutch.Yes 2-2No Repair wiring2-2 Check the poor contact in wiring of the malfunctioningclutch.Yes 3-1No Repair wiring3Board 3-1Check if DC voltage (about 12V) is applied between No.1pin and No.4 pin of the connector CN019 (7P: white) on themain board in the outdoor unit.Yes 4-1No Replace the main board inthe outdoor unit.4Electriccomponent 4-1 Does the relay (RY004) on the power board in the outdoorunit operate normally? (Check the sound of relay operation.)Yes 5-1No Replace the power boardin the outdoor unit.5Compressor5-1Is the compressor defective?* The compressor is considered to be normal if thedifferential pressure of the refrigerant circuit becomeslarger (increase in high pressure and decrease in lowpressure) 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)21IV–103
