Mitsubishi Electric SUZ error codes
Codes
- FLError codeRefrigerant leakage Abnormal if the refrigerant leakage detected by a refrigerant sensor.
- P8Error code(2) Abnormal if communication between outdoor controller circuit board and M-NET board is not available. Pipe temperature <Cooling mode> Detected as abnormal when the pipe temperature is not in the cooling range 3 minutes after compressor start and 6 minutes after the liquid or condenser/evaporator pipe is out of cooling range. Note 1: It takes at least 9 minutes to detect. Note 2: Abnormality P8 is not detected in dry mode. Cooling range: Indoor pipe temperature (TH2 or TH5) − intake temperatur
- PLError codeAbnormal refrigerant circuit During Cooling, Dry, or Auto Cooling operation, the following conditions are regarded as failures when detected for 1 second. a) The compressor continues to run for 30 or more seconds. b) The liquid pipe temperature or the condenser/evaporator temperature is 167°F [75°C] or more. These detected errors will not be cancelled until the power source is reset. BY INFERIOR PHENOMENA Factor does not 12 VDC is not supplied to 12–15 VDC is supplied to remote no display is ind
- U1Error codeHigh pressure (High pressure switch 63H operated) /High compressor temperature (Thermal protector TRS operated) Abnormal if the high pressure switch 63H (4.15 MPa, 602 psig) or thermal protector TRS (248˚F [120°C]) operated during compressor operation • 63H: High pressure switch
- U2Error code(TH4: 1102) (TH33: 1132) (refrigerant shortage: 1501): High discharge temperature (1) Abnormal if TH4 exceeds 257°F [125°C] or 230°F [110°C] continuously for 5 minutes. Abnormal if TH4 exceeds 230°F [110°C] or more continuously for 30 seconds after 90 seconds have passed since the defrosting operation started. (2) Abnormal if discharge superheat (Cooling: [Higher temperature of TH4 orTH33]−TH6 / Heating: [Higher temperature of TH4 or TH33]−TH5) exceeds 176°F [80°C] continuously for 10 minutes. Note: TH4: Thermistor <Discharge> High comp. surface tem
- U3Error code(Detection is inoperative for 10 minutes of compressor starting process and for 10 minutes after and during defrosting.) • TH4: Thermistor <Discharge pipe> • TH33: Thermistor <Comp. surface>
- U4Parameter(PAC-SK52ST) (Refer to "10-9. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS".) Thermistors Open detection Name Thermistor
- U5Error codeTemperature of heatsink Abnormal if heat sink thermistor(TH8) detects temperature indicated below. KA24································ 170°F [77°C] KA30/36···························· 177°F [81°C]
- U6Error codePower module Check abnormality by driving power module if overcurrent is detected. (UF or UP error condition)
- U7Error codeToo low superheat due to low discharge temperature Abnormal if discharge superheat is continuously detected less than or equal to 5˚F [−15°C] for 3 minutes even though linear expansion valve has minimum open pulse after compressor starts operating for 10 minutes.
- U8Error codeOutdoor fan motor Abnormal if the rotational frequency of fan motor is not detected during DC fan motor operation. Fan motor rotational frequency is abnormal if the following conditions are observed: • 100 rpm or below detected continuously for 15 seconds at 68˚F [20°C] or more outside air temperature. • 50 rpm or below or 1500 rpm or more detected continuously for 1 minute.
- U9Error codeDetailed To find out the detail history (latest) codes Refer to "10-9. FUNCTION OF SWITCHES, Overvoltage error • Increase to DC bus voltage to 430V 01 Undervoltage error • Instantaneous decrease in DC bus voltage to 200 V 02 Input current sensor error • Decrease in input current through outdoor unit to 0.5 A 04 only if operation frequency is more than or equal to 40 Hz or compressor current is more than or equal to 6 A. Abnormal power synchronous signal • No input of power synchronous signal to | Detailed To find out the detail history (latest) codes Refer to "10-9.
- UDError codeIt is abnormal for 44 A the input current or 10 seconds continuous 40 A or more. Overheat protection Abnormal if outdoor liquid pipe thermistor (TH3) detects 158˚F [70°C] or more during compressor operation.
- UEError codeAbnormal pressure of 63HS Abnormal if 63HS detects 14.5 PSIG [0.1 MPa] or less. Detection is inoperative for 3 minutes after compressor starting and 3 minutes after and during defrosting. 63HS: High pressure sensor
- 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 • Type 36/42 : It is abnormal for 38A the input current or 10 seconds continuous 34 A or more. • Type 48/60 : It is abnormal for 44A the input current or 10 seconds continuous 40 A or more.
- ULError codeLow pressure Abnormal if the following conditions are detected continuously for 3 minutes after compressor starts heating operating for 10 minutes. (1) Heating mode Detection mode 1 TH7 − TH3 ≤ 7°F [4°C] and TH5 − Indoor room temperature ≤ 4°F [2°C] Detection mode 2 TH7 − TH3 ≤ 4°F [2°C] and TH5 − Indoor room temperature ≤ 7°F [4°C] and TH2 − Indoor room temperature ≤ 7°F [4°C] Detection mode 3 TH7 − TH3 ≤ 7°F [4°C] and TH5 − Indoor room temperature ≤ 4°F [2°C] and TH4 − TH5 ≥ 36°F [20°C] (2) Co
- UPError codeCompressor overcurrent interruption Abnormal if overcurrent DC bus or compressor is detected after compressor starts operating for 30 seconds.