Panasonic 26PEK1U6 Tech Data - Service Manual - Page 169

4-2. Symptoms and Parts to Inspect Remote controller alarm display Alarm contents Judgment condition P03 Abnormal discharge Stops when temp. exceeds temperature • Discharge temp. 232 ˚F. detected at or above the specified value. P04 High pressure Stops when pressure switch is activated. exceeds 600 psi. Compressor motor Stops when temp. exceeds thermal protector is 230 ˚F. activated. 4. Service procedures Clear condition Judgment and correction Recovery at restart 1. Check refrigerant cycle (gas leak). 2. Electronic control valve trouble 3. Check tubing sensor (TD). Recovery at restart 1. Check the high pressure switch connector is securely connected. 2. Check the ourdoor unit heat exchanger is not clogged (cooling operation). 3. Check the indoor unit air filter has not become clogged (heating operation) P05 Missing phase Current value sent from MDC Recovery at restart 1. Check R/S/T power. detected. (CT on outdoor unit control PCB is 2. Check inverter control PCB. disconnected or AC low. 3. Check outdoor unit control power trouble) No AC power input for 3 PCB. minutes or longer: pre-trip - 5 P15 Insufficient gas level The following conditions Recovery at restart Check refrigerant cycle detected. continue for 1 minute. (gas leak). • Discharge temp. is 203 ˚F or higher. • Electronic control valve is at step 480. • Current value from MDC is 2.0 A or less. P19 4-way valve locked Indoor heat exchanger temp. Recovery at restart 1. Check 4-way valve. • Judgment occurs drops although compressors 2. Check 4-way valve wiring. after compressor are ON in heating mode: has been ON for 5 [min(E1, E2)] ≤ 50 ˚F. 3. Check outdoor unit control PCB. minutes. Indoor heat exchanger temp. rises although compressors are ON in cooling mode: E2 ≥ 104 ˚F. P20 High-pressure If MAX (C1,C2) is 142°F or Recovery at restart 1. Refrigerant cycle protection trouble higher, the compressor stops overload operation one. The compressor restarts 2. Outdoor coil temperature three time, and if the temperature does not decrease to less than 142°F, sensor C1 or C2 4 the alert "P20" is displayed. P22 Outdoor unit fan Inverter stops after alarm is Recovery at restart 1. Position detection trouble motor trouble detected 2. Overcurrent protection • Inverter protection circuit at outdoor unit fan circuit was motor was activated. activated, or lock • Check outdoor unit control was detected, at PCB. outdoor unit fan • Refer to outdoor unit fan motor. judgment methods. P26 Inverter protection Inverter stops after alarm is Recovery at restart 1. Stops immediately when circuit was detected. Alarm is output restarted. activated, or G-Tr when inverter stops (pre-trip) • Layer short in the short-circuit (short consecutively 4 times. compressor time: 0.8 s or less) 2. Check inverter control in inverter control PCB. • Wiring trouble 4-5