Haier 3U19FS1ERA Service Manual - Page 100

Trouble 8: Outdoor unit alarms sensor failure start as per the wiring diagram, check if no connection port between sensor and PCB is correct yes re-fix the sensor and check again check if the sensor is in open circuit or no the connection port check if the sensor resistor no to PCB is in good value is correct condition yes yes replace sensor and check again PCB is faulty and repalce it, check again >_]]VbTZR\ _^UZdZ_^Vb replace sensor and check again Trouble 9: AC current over current protection or current transducer damaged, or compressor blocked rotor, compressor great vibration, compressor abnormal startup, state detecting curcuit abnormal or compressor damaged. The former twice failure can be resumed automatically, if outdoor board occurs this failure always, and can not be resumed for a long time, that shows: 1. Power module (SPDU) damaged, please replace the power module, then re-wiring as per the wiring diagram (70% possibility) 2. Short circuit in power board results in the power module damaged (15％ possibility) 3. Damaged compressor results in this failure (10％ possibility) 4. Main control board is faulty, replace it (5％ possibility) Trouble 10: High pressure failure Reasons: 1. Over high system pressure results that the unit stop, and the compressor protection will work. The failure can be resumed. 2. Pressure switch wire is not fixed well or in open circuit. start check if the connector between pressure switch and PCB is fixed badly or damaged yes replace pressure switch connector, shut off and be electrified again, re-check no check if the 2 straight lugs on the pressure switch are in good condition yes replace pressure switch connector, shut off and be electrified again, re-check if outdoor fan no motor cannot no startup normally in cooling mode yes check if the no outdoor motor has power input replace main control board and check again replace outdoor motor and check again -99-