Mitsubishi Electric PAC error codes
Codes
- 0403Error codeSerial communication error 1.Abnormal if serial communication between outdoor controller circuit board and outdoor power circuit board is defective.
- 1102Error code(1) High discharging/compressor temperature Abnormal if discharge/compressor temperature thermistor (TH4) exceeds 125: [257°F] or 110: [230°F] continuously for 5 minutes. Abnormal if pressure detected by high pressure sensor and converted to saturation temperature exceeds 40: [104°F] during defrosting and discharge/compressor temperature thermistor (TH4) exceeds 110: [230°F]. (2) Refrigerant shortage abnormality When the conditions of below detecting 1 mode or are satisfied (1st detec1 2 tion) d
- 1300Error codeLow pressure (63L operated) Abnormal if 63L is operated (under –0.03MPa [–4.35PSIG]) during compressor operation. 63L: Low-pressure switch
- 1302Error code(1) High-pressure switch (63H) operated Abnormal if high-pressure switch 63H operated ( ) during compressor operation. w 4.15 MPa [602PSIG] w 63H: High-pressure switch (2) High pressure (High - pressure sensor 63HS detect) When high-pressure sensor detects 1 4.31MPa [625PSIG] or more (or over 4.15MPa [602PSIG] for 3 minutes) (1st detection) during the compressor operation, the compressor stops and restarts operation in 3 minutes. When the sensor detects 4.31MPa 2 [625PSIG] or more (or over 4.15M
- 1520Error code(1) Too low superheat due to low discharge/compressor temperature Abnormal if discharge superheat is continuously detected –15: [-27°F] or less even though linear expansion valve has minimum open pulse after compressor starts operating for 10 minutes. (2) Erroneous connection of refrigerant pipes or the connecting wires Consider the stopping indoor unit abnormal if condenser/evaporator temperature thermistor (TH5 or RT12) detects –5: [23°F] or below continuously for 5 minutes during a compressor
- 2520Error codeForced compressor stop (Overlap malfunction of drain pump in indoor unit and linear expansion valve in branch box.) When condition which the outdoor unit is stopped forcibly consists, or the drain sensor detects continuously to go under water 5 times, and also detects ''[liquid pipe temperature-suction temperature] –10°C [–18°F]'' for 30 minutes continuously, the indoor unit stops abnormally (however, fan operates by normal control) that indoor unit and excluding [Fan mode or OFF] in same refr
- 4100Error codeCompressor overcurrent interruption (When compressor locked) Abnormal if overcurrent of DC bus or compressor is detected within 30 seconds after compressor starts operating.
- 4119Error code2 connector open Abnormal if both 63H and 63L connector circuits are open for 3 minutes continuously after power supply 63H: High-pressure switch 63L: Low-pressure switch
- 4210Error codeCompressor overcurrent interruption Abnormal if overcurrent DC bus or compressor is detected after compressor starts operating for 30 seconds.
- 4220Error codeOvervoltage or voltage shortage and abnormal synchronous signal to main circuit Abnormal if any of followings are detected during compressor operation;
- 4230Error codeAbnormal temperature of heatsink Abnormal if heatsink thermistor (TH8) detects temperature indicated 93 °C [200 °F]
- 4250Error codeAbnormality of power module Check abnormality by driving power module in case overcurrent is detected. (UF or UP error condition)
- 4400Error codeOutdoor fan motor The outdoor fan motor is considered to be abnormal if the rotational frequency of fan motor is abnormal when detected during operation. Fan motor rotational frequency is abnormal if; • 100 rpm or below detected continuously for 15 seconds at 26: [79°F] or more outside air temperature • 50 rpm or below or 1500 rpm or more detected continuously for 1 minute.
- 5104Error code(Detection is inoperative for 10 minutes of compressor starting process and for 10 minutes after and during defrosting.)
- 5201Error code63H connector open Abnormal if 63H connector circuit is open for 3 minutes continuously after power supply 63H: High-pressure switch
- 5202Error code— 63L connector open Abnormal if 63L connector circuit is open for 3 minutes continuously after power supply 63L: Low-pressure switch
- 5300Error codeCurrent sensor error Abnormal if current sensor detects –1.5A to 1.5A during compressor operation. (This error is ignored in case of test run mode.) Abnormal if input current exceeds 38 A or 34A continuously 10 seconds. (Current sensor on noise filter board detects input current)
- 6840Error codeIndoor - branch box/branch box - outdoor unit communication error (Signal receiving error) (Branch box/outdoor unit) (1) Abnormal if branch box/outdoor controller circuit board could not receive anything normally for 3 minutes.
- 6841Error codeIndoor - branch box/branch box - outdoor unit communication error (Transmitting error) (Branch box/outdoor unit) (1) Abnormal if “0” receiving is detected 30 times continuously though branch box/ outdoor controller circuit board has transmitted “1”. (2) Abnormal if branch box/outdoor controller circuit board could not find blank of transmission path for 3 minutes.
- 6844Error codeIndoor–branch box/branch box–outdoor unit connector miswiring, excessive number of units 1. Outdoor/branch box controller circuit board can automatically check the number of connected indoor units. Abnormal if the number cannot be checked automatically due to miswiring of indoor– branch box/branch box–outdoor unit connecting wire and etc. after power is turned on for 4 minutes.
- 6845Error codeMiswiring of indoor–branch box/branch box–outdoor unit connecting wire (converse wiring or disconnection) Outdoor/branch box controller circuit board can automatically set the unit number of indoor units. Abnormal if the indoor unit number can not be set within 4 minutes after power on because of miswiring (converse wiring or disconnection) of indoor–branch box/ branch box–outdoor unit connecting wire.
- 6846Error codeStart-up time over The unit cannot finish start-up process within 4 minutes after power on.
- E0Error codeRemote controller transmission error (E0)/signal receiving error (E4) 1 Abnormal if main or sub remote controller cannot receive any transmission normally from Interface unit of refrigerant address “0” for 3 minutes. (Error code: E0) 2 Abnormal if sub-remote controller could not receive any signal for 2 minutes. (Error code: E0) 1 Abnormal if Interface controller board | Remote controller transmission error (E0)/signal receiving error (E4) 1 Abnormal if main or sub remote controller cannot receive any transmission normally from FTC of refrigerant address “0” for 3 minutes. (Error code: E0) 2 Abnormal if sub-remote controller could not receive any signal for 2 minutes. (Error code: E0) 1 Abnormal if FTC can not receive any data normally from remote controller board or from other Interface/Flow temp.
- E1Error codeRemote controller control board 1 Abnormal if data cannot be read normally from the nonvolatile memory of the remote controller control board. (Error code: E1)
- E3Error code(No display): utes. Remote controller communication error (Transmitting error) (1) Abnormal if sub remote controller could not find blank of transmission path for 6 seconds. (2) Abnormal if remote controller could not finish transmitting 30 times continuously.
- E5Error code2 When Interface controller receives the transmitted data same time and compares these data. Abnormal if the data is judged to be different for 30 continuous times. (Error code: E5) | judged to be different for 30 continuous times. (Error code: E3) 1 Abnormal if FTC could not find blank of transmission path. (Error code: E5) 2 When FTC receives the transmitted data same time and compares these data. Abnormal if the data is judged to be different for 30 continuous times. (Error code: E5)
- E8Error codeIndoor - branch box/branch box - outdoor unit communication error (Signal receiving error) (Branch box/outdoor unit) (1) Abnormal if branch box/outdoor controller circuit board could not receive anything normally for 3 minutes.
- E9Error codeInterface unit/outdoor unit communication error (Transmitting error) (Outdoor unit) (1) Abnormal if “0” receiving is detected 30 times continuously though outdoor controller circuit board has transmitted “1”. (2) Abnormal if outdoor controller circuit board could not find blank of transmission path for 3 minutes. | FTC/outdoor unit communication error (Transmitting error) (Outdoor unit) (1) Abnormal if “0” receiving is detected 30 times continuously though outdoor controller circuit board has transmitted “1”. (2) Abnormal if outdoor controller circuit board could not find blank of transmission path for 3 minutes.
- EAError codeIndoor–branch box/branch box–outdoor unit connector miswiring, excessive number of units 1. Outdoor/branch box controller circuit board can automatically check the number of connected indoor units. Abnormal if the number cannot be checked automatically due to miswiring of indoor– branch box/branch box–outdoor unit connecting wire and etc. after power is turned on for 4 minutes.
- EBError codeMiswiring of indoor–branch box/branch box–outdoor unit connecting wire (converse wiring or disconnection) Outdoor/branch box controller circuit board can automatically set the unit number of indoor units. Abnormal if the indoor unit number can not be set within 4 minutes after power on because of miswiring (converse wiring or disconnection) of indoor–branch box/ branch box–outdoor unit connecting wire.
- ECError codeStart-up time over The unit cannot finish start-up process within 4 minutes after power on.
- EDError codeSerial communication error 1.Abnormal if serial communication between outdoor controller circuit board and outdoor power circuit board is defective.
- EFError code(6607 6608): Non defined error code This code is displayed when non defined error code is received.
- F3Error code— 63L connector open Abnormal if 63L connector circuit is open for 3 minutes continuously after power supply 63L: Low-pressure switch
- F5Error code63H connector open Abnormal if 63H connector circuit is open for 3 minutes continuously after power supply 63H: High-pressure switch
- F9Error code2 connector open Abnormal if both 63H and 63L connector circuits are open for 3 minutes continuously after power supply 63H: High-pressure switch 63L: Low-pressure switch
- PAError codeForced compressor stop (Overlap malfunction of drain pump in indoor unit and linear expansion valve in branch box.) When condition which the outdoor unit is stopped forcibly consists, or the drain sensor detects continuously to go under water 5 times, and also detects ''[liquid pipe temperature-suction temperature] –10°C [–18°F]'' for 30 minutes continuously, the indoor unit stops abnormally (however, fan operates by normal control) that indoor unit and excluding [Fan mode or OFF] in same refr
- U1Error code(1) High-pressure switch (63H) operated Abnormal if high-pressure switch 63H operated ( ) during compressor operation. w 4.15 MPa [602PSIG] w 63H: High-pressure switch (2) High pressure (High - pressure sensor 63HS detect) When high-pressure sensor detects 1 4.31MPa [625PSIG] or more (or over 4.15MPa [602PSIG] for 3 minutes) (1st detection) during the compressor operation, the compressor stops and restarts operation in 3 minutes. When the sensor detects 4.31MPa 2 [625PSIG] or more (or over 4.15M
- U2Error code(1) High discharging/compressor temperature Abnormal if discharge/compressor temperature thermistor (TH4) exceeds 125: [257°F] or 110: [230°F] continuously for 5 minutes. Abnormal if pressure detected by high pressure sensor and converted to saturation temperature exceeds 40: [104°F] during defrosting and discharge/compressor temperature thermistor (TH4) exceeds 110: [230°F]. (2) Refrigerant shortage abnormality When the conditions of below detecting 1 mode or are satisfied (1st detec1 2 tion) d
- U3Error code(Detection is inoperative for 10 minutes of compressor starting process and for 10 minutes after and during defrosting.)
- U4Error code(TH3:5105) (TH7:5106) (TH8:5110) (63HS:5201) ( ) TH-A~E :5131: (1) Open/short circuit in the outdoor unit thermistors (TH3, TH7, and TH8) and branch box’s thermistors(TH-A~E) Abnormal if open or short circuit is detected while the compressor is operating. WCheck which unit has abnormality in its thermistor by switching the mode of SW2. (Refer to 9-8.) Open/short circuit in the branch box
- U5Error codeAbnormal temperature of heatsink Abnormal if heatsink thermistor (TH8) detects temperature indicated 93 °C [200 °F]
- U6Error codeAbnormality of power module Check abnormality by driving power module in case overcurrent is detected. (UF or UP error condition)
- U7Error code(1) Too low superheat due to low discharge/compressor temperature Abnormal if discharge superheat is continuously detected –15: [-27°F] or less even though linear expansion valve has minimum open pulse after compressor starts operating for 10 minutes. (2) Erroneous connection of refrigerant pipes or the connecting wires Consider the stopping indoor unit abnormal if condenser/evaporator temperature thermistor (TH5 or RT12) detects –5: [23°F] or below continuously for 5 minutes during a compressor
- U8Error codeOutdoor fan motor The outdoor fan motor is considered to be abnormal if the rotational frequency of fan motor is abnormal when detected during operation. Fan motor rotational frequency is abnormal if; • 100 rpm or below detected continuously for 15 seconds at 26: [79°F] or more outside air temperature • 50 rpm or below or 1500 rpm or more detected continuously for 1 minute.
- U9Error codeOvervoltage or voltage shortage and abnormal synchronous signal to main circuit Abnormal if any of followings are detected during compressor operation;
- UFError codeCompressor overcurrent interruption (When compressor locked) Abnormal if overcurrent of DC bus or compressor is detected within 30 seconds after compressor starts operating.
- UHError codeCurrent sensor error Abnormal if current sensor detects –1.5A to 1.5A during compressor operation. (This error is ignored in case of test run mode.) Abnormal if input current exceeds 38 A or 34A continuously 10 seconds. (Current sensor on noise filter board detects input current)
- ULError codeLow pressure (63L operated) Abnormal if 63L is operated (under –0.03MPa [–4.35PSIG]) during compressor operation. 63L: Low-pressure switch
- UPError codeCompressor overcurrent interruption Abnormal if overcurrent DC bus or compressor is detected after compressor starts operating for 30 seconds.