IV–81P01 Indoor Fan Error/Indoor Unit Fan rpm Error(Cannot be detected when the water heat exchanger unit is connected.)c Error detection method• Detects when indoor control board connector T20 (gray) CN076 1-3 are open and assumes an error hasoccurred.• The sensor connected to T20 (gray) CN076 may be an internal thermostat built into the fan motor, or athermal magnet switch, depending on the model.• The internal thermostat turns the contact OFF when the fan motor coil temperature rises, and automaticallyrecovers as the coil temperature decreases, turning the contact ON.• The thermal magnet switch turns the contact OFF when the fan motor operation current becomes excessive,and turns the contact ON when normal or when recovered.• The wiring method and protective devices differ among indoor units. For details, see the electric diagramdiagrams for each indoor unit.Basic circuitIndoor control boardRelay connectorFan motor winding coil protectionthermostatT20 (gray)• Models not listed below have one fan motor, with an internal thermostat contact connected between No.1 andNo.3 T20 (gray) CN076.• Models with two fan motors, with the internal thermostat contacts connected in-line between No.1 and No.3of T20 (gray) CN076.• If a fan stop signal comes from the indoor unit or data does not come from the indoor unit for three minutes(communication error) even though the outdoor unit forces the indoor fan to stop, a P01 warning will result.d Troubleshooting1Fan motor 1-1 Is there AC 200V between indoor control board connector IN(black) CN067 No.3 and connector T20 (gray) CN076 No.3?Yes 1-4No 1-21-2 Any poor contact or broken wires in wiring between No.1 andNo.3 of connector T20 (gray)?Yes RepairNo 1-31-3 The fan motor winding coil protection thermostat has activated. Check for dirty filter, fan motorlock, foreign matter caught in the fan, etc. For a three-phase motor, check for missing phase.1-4 Operate again to check activation. Immediate error uponoperation?Yes Replace indoor controlboardNo 1-31-5 Poor connection or broken wires in communication lines?Yes RepairNo Replace indoor controlboard● For board and Electrical Wiring Diagram, see Chapter 6.• Outdoor main board: page VI-2• Outdoor power board: page VI-3• Converter board: VI-4• Indoor control board for DC motor models: page VI-5• Outdoor Unit Electrical Wiring Diagram: page VI-6● See instructions packaged with servicing indoor control board for procedure on replacing indoor controlboard.
