Mitsubishi Electric Ecodan PUZ-WM outdoor unit (R32)
Mitsubishi Electric · Heat pumps · 33 codes · 26 with plain-language explanation
Guides
- Ecodan PUZ-WM: is the error code recurring or a one-off?
Present and past check codes are logged. The service manual asks to consider temporary causes, re-check the installation and reset the logs after the work.
- Ecodan PUZ-WM: power supply, snow and condensate – what the user can do
The manual explains keeping the power on, waiting before switching on again, not washing the outdoor unit with water and why condensate drains from the unit.
Error codes
- E0 Remote controller transmission error (E0) / signal receiving error (E4) with plain-language explanation
- E1 Remote controller control board (nonvolatile memory read error) with plain-language explanation
- E2 Remote controller control board (clock function error) source text only
- E3 Remote controller transmission error (E3) / signal receiving error (E5) with plain-language explanation
- E4 Remote controller transmission error (E0) / signal receiving error (E4) with plain-language explanation
- E5 Remote controller transmission error (E3) / signal receiving error (E5) with plain-language explanation
- E8 Indoor/outdoor unit communication error (signal receiving error, outdoor unit) with plain-language explanation
- E9 Indoor/outdoor unit communication error (transmitting error, outdoor unit) with plain-language explanation
- EA Indoor/outdoor unit connector miswiring, excessive number of units (2 units or more) with plain-language explanation
- EC Startup time over with plain-language explanation
- EE Incorrect connection (outdoor unit does not receive the signals of I/F or FTC) source text only
- EF Non defined check code source text only
- Eb Miswiring of indoor/outdoor unit connecting wire (reverse wiring or disconnection) with plain-language explanation
- Ed Serial communication error (outdoor controller board – power board) with plain-language explanation
- F5 63H connector open (63H: High pressure switch) with plain-language explanation
- P6 Freezing/overheating protection is working with plain-language explanation
- P8 Pipe temperature with plain-language explanation
- PE Inlet water temperature (return water too cold) with plain-language explanation
- U1 High pressure (High pressure switch 63H operated) with plain-language explanation
- U2 High discharge temperature / high compressor surface temperature with plain-language explanation
- U3 Open/short circuit of outdoor unit temperature thermistor (TH4, TH33) with plain-language explanation
- U4 Open/short of outdoor unit thermistors (TH3, TH34, TH6, TH7, TH8) with plain-language explanation
- U5 Temperature of heat sink (TH8) with plain-language explanation
- U6 Power module (overcurrent detected) with plain-language explanation
- U7 Too low superheat due to low discharge temperature with plain-language explanation
- U8 Outdoor fan motor (rotational frequency abnormal) with plain-language explanation
- U9 Overvoltage/undervoltage, input current sensor/L1-phase open, power synchronous signal or PFC/IGBT error (detailed codes 01–20) with plain-language explanation
- UE Abnormal pressure of 63HS (≤ 0.1 MPa) with plain-language explanation
- UF Compressor overcurrent interruption (when compressor locked) with plain-language explanation
- UH Current sensor error or input current error source text only
- UL Low pressure source text only
- UP Compressor overcurrent interruption source text only
- Ud Overheat protection (TH3 / T63HS ≥ 70 °C) source text only