Sanyo 26KHHS72R Service Manual - Page 151

4-2. Symptoms and Parts to Inspect 4. Service procedures Remote controller alarm display Alarm contents Judgment condition P03 Abnormal discharge Stops when temp. exceeds temperature 232 ˚F. • Discharge temp. 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. P05 Missing phase Current value sent from MDC detected. (CT on outdoor unit control PCB is disconnected or AC low. power trouble) No AC power input for 3 minutes or longer: pre-trip - 5 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) Recovery at restart 1. Check R/S/T power. 2. Check inverter control PCB. 3. Check outdoor unit control PCB. P15 Insufficient gas level The following conditions Recovery at restart Check refrigerant cycle detected. continue for 1 minute. (gas leak). 1 • 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. 2 after compressor are ON in heating mode: 3. Check outdoor unit control has been ON for 5 [min(E1, E2)] ≤ 50 ˚F. 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 3 protection trouble higher, the compressor stops overload operation one. The compressor restarts three time, and if the 2. Outdoor coil temperature sensor C1 or C2 temperature does not decrease to less than 142°F, the alert "P20" is displayed. 4 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 motor. • Refer to outdoor unit fan judgment methods. 5 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) in inverter control 2. Check inverter control PCB. 6 • Wiring trouble SM831148 IV-5