Panasonic 26PSU1U6 Tech Data - Service Manual - Page 170
Judgment condition, Clear condition, Alarm, contents, Judgment and correction, Remote, controller
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4. Service procedures Remote controller alarm display Alarm contents Judgment condition Clear condition Judgment and correction P29 Current detection Inverter stops after alarm is Recovery at restart 1. Stops immediately when circuit trouble detected. Alarm is output restarted. • AC current value is when inverter stops (pre-trip) • Layer short in the high even when consecutively 4 times. compressor compressor is 2. Check inverter control PCB. stopped. • Wiring trouble Compressor motor output trouble, Inverter compressor trouble, MDC trouble Inverter stops after alarm is detected. Recovery at restart 1. Refrigerant cycle trouble, overload operation 2. Loose screws and contact failure between HIC control PCB and radiating plate 3. Cooling failure of radiating plate 4. Check outdoor unit PCB wiring. Compressor does not run. (Overcurrent protection circuit activates after a certain period of time following compressor start.) Inverter stops after alarm is detected. Recovery at restart 1. Compressor trouble (locked, etc.) • Replace the compressor. 2. Compressor wiring trouble (missing phase) Compressor breakdown • Starts to operate but operating frequency drops and compressor stops. Inverter stops after alarm is detected. Recovery at restart 1. Check power voltage: AC 203 V ± 20 V or 230 V ± 23 V. 2. Refrigerant cycle overload operation 3. Check AC current detection circuit. Inverter control PCB position detection circuit trouble Inverter stops after alarm is detected. Recovery at restart Position detection circuit is activated even when the compressor 3P connector is disconnected and the compressor operated. • Replace the inverter control PCB. F04 Disconnection, open 26, 36 MODEL: Automatic recovery 1. Check discharge temp. circuit, or short circuit Sensor detection trouble sensor (TD). in discharge temp. sensor (TD) (194°F or higher when 15 minutes have elapsed after compressor stopped). 2. Check outdoor unit control PCB. (Open circuit) 42 MODEL: Sensor defection trouble (194°F or higher when 60 minutes have elapsed after 4 compressor stopped). (Open circuit) F06 F07 F08 F12 Disconnection, open circuit, or short circuit in outdoor heat exchanger temp. sensor (C1) Disconnection, open circuit, or short circuit in outdoor heat exchanger temp. sensor (C2) Disconnection, open circuit, or short circuit in outdoor air temp. sensor (TO) Open circuit or short circuit Open circuit or short circuit Open circuit or short circuit Disconnection, open circuit, or short circuit in intake temp. sensor (TS) Open circuit or short circuit Automatic recovery 1. Check outdoor heat exchanger temp. sensor (C1). 2. Check outdoor unit control PCB. Automatic recovery 1. Check outdoor heat exchanger temp. sensor (C2). 2. Check outdoor unit control PCB. Automatic recovery Automatic recovery 1. Check outdoor air temp. sensor (TO). 2. Check outdoor unit control PCB. 1. Check intake temp. sensor (TS). 2. Check outdoor unit control PCB. 4-6