Mitsubishi Electric PU error codes
Codes
- F1Error codedetected when the power is put on> Meaning of error code and detection method — Reverse phase detection, Power supply and indoor/outdoor unit connecting wire converse connection 1. Three seconds after power on, judge reverse phase by detecting voltage phase of each phase. 2. Abnormal four minutes after power on if power supply and indoor/outdoor unit connecting wire have converse connection.
- F2Error codeL3-phased open phase detection Detect open phase two seconds after power on.
- F3Error code63L connector open Abnormal if 63L connector circuit is open for three minutes continuously after power supply. 63L: Low-pressure switch (PUH-P5, 6YGA and PU-P5, 6YGA Only.)
- F4Error codeThe connector of 49C is open Consider the unit abnormal when the circuit of connector (49C) remains open for three consecutive minutes with the power on. 49C: Inner thermostat (Compressor) (PUH-P5, 6YGA and PU-P5, 6YGA Only.)
- F7Error codeReverse phase detector circuit (controller board) fault Abnormal if some of each phase detection signal is not input three seconds after power supply.
- F9Error code2 or more connectors open Abnormal if two more out of connector (63L, 49C, 51CM) circuits are open for three minutes continuously after power on.
- FAError code51CM connector open Abnormal if 51CM connector circuit is open for three minutes continuously after power on. 51CM: Thermal Relay
- P1Error codemistor (TH1) The unit is in three-minute resume pre1 vention mode if short/open of thermistor is detected. Abnormal if the unit dose not reset normally after three minutes. (The unit returns to normal operation, if it has normally reset.) Constantly detected during Cooling, dry2 ing, and heating operation. Short: 90: or more Open: -40: or less
- P2Error codeAbnormality of pipe temperature thermistor/Liquid (TH2) The unit is in three-minute resume pre1 vention mode if short/open of thermistor is detected. Abnormal if the unit does not reset normally after three minutes. (The unit returns to normal operation, if it has normally reset.) Constantly detected during Cooling, dry2 ing, and heating (except defrosting) operation.
- P4Error codeAbnormality of drain sensor (DS) Suspensive abnormality, if short/open of 1 thermistor is detected for 30 seconds continuously. Put off compressor and indoor fan. (The unit returns to normal operation, if it has normally reset.) Detect the following condition. 3 • During cooling and drying operation. • In case that pipe <liquid> temperatureroom temperature <-10deg (Except defrosting) • When pipe <liquid> temperat
- P5Error codeMalfunction of drain pump (DP) Suspensive abnormality, if thermistor of 1 drain sensor is let heat itself and temperature rises slightly. Put off compressor and indoor fan. Constantly detected during drain pomp 3 operation.
- P6Error codeFreezing/overheating protection is working Freezing protection 1 The unit is in six-minute resume prevention mode if pipe <liquid or condenserevaporator> temperature stays under -15: for three minutes, three minutes after the compressor started. Abnormal if it stays under -15: for three minutes again within 16 minutes after six-minute resume prevention mode. Overheating protection 2 The units is in six-minute resume prevention mode if pipe <condenser-evaporator> temperature is detected as over 7
- P8Error codeAbnormality of pipe temperature (Cooling mode) Detected as abnomal when the pipe temperature is not in the cooling range 3 minutes later of compressor start and 6 minutes later of the liquid or condenser/evaporator pipe is out of cooling range. Note 1) It takes at least 9 min. to detect. Note 2) Abnormality P8 is not detected in drying mode.
- P9Error codeAbnormality of pipe temperature thermistor / Condenser-Evaporator (TH5) The unit is in three-minute resume pro1 tection mode if short/open of thermistor is detected. Abnormal if the unit is not get back to normal within three minutes. (The unit returns to normal operation, if it has normally reset.) Constantly detected during cooling, dry2 ing, and heating operation (except defrosting) Short: 90: or more Open: -40: or less TH5 temperature 1 2 3 4 5 6 1 2 3 4 5 Indoor unit No.1 Indoor unit No.2 O
- U1Error code63H: High-pressure switch Use current sensor to detect work or 8 return of 63H. • Abnormal if current detected phase (Vphase) is open phase after first compressor start-up after supplying the power by three phase power supply model. • When compressor is operating, compressor is suspended
- U2Error codeAbnormal high discharging temperature Abnormal if discharging temperature thermistor (TH4) exceeds following temperature during compressor operation. Normal operation: 125: or more for three minutes continuously or 135: During defrosting: 135: | Inner thermostat (49C) working detector Abnormal if inner thermostat (49C) works during compressor operation. 49C: inner thermostat 135I5: [PU(H)-P5, 6YGA] | Abnormal shortage of refrigerant Abnormal if intake super heat exceeds following temperature during heating compressor operation. 70: or more, and indoor pipe <condenserevaporator> temperature (TH5) is 35: or less.
- U3Error code(Detection is inoperative for five minutes of compressor starting process and for 10 minutes after defrosting.)
- U4Error code(Detection is inoperative for seven minutes after 10 seconds of compressor starting and for 10 minutes after defrosting.)
- U6Error codeCompressor over current (overload) breaking (only P35Y-P140Y) Abnormal if current value exceeds overload set value during compressor operation. P35 ·····4.5 P50 ·····5.8 P60 ·····6.4 P71 ·····8.0 P100 ·····9.0 P125 ·····15.0 P140 ·····17.0
- UDError codeOver heat protection (over-load operation protection/abnormal fan) Abnormal if pipe thermistor detects the value that exceeds set value during compressor operation. P1.6-P6······70:
- UEError codeAbnormal High pressure (63H worked) This error is detected (3.24MPa) from 63H action within 20 seconds of compressor starting in the first heating mode after power on. 63H: high-pressure switch
- UFError codeCompressor over current (start-up locked) breaking Abnormal if compressor current exceeds 1.2 times of overload set value.
- UHError codeCurrent sensor error Abnormal if compressor current is not detected on first compressor start-up after power supply is put on.
- ULError codeAbnormal low pressure (63H worked) Abnormal if connector (63L) is open (under0.03MPa) during compressor operation.