All Mitsubishi Heavy Industries error codes
This page gathers Mitsubishi Heavy Industries error codes sorted by failure type: what each code means, its likely causes, and what you can safely check before calling a professional.
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The Mitsubishi Heavy Industries codes on this page, grouped by failure type.
Temperature sensor — Mitsubishi Heavy Industries
These codes indicate a sensor that’s no longer returning a consistent value. The fault almost always comes from the sensor itself or its connector, rarely from the unit.
Code E1Medium severityair-to-air
Remote control communication error
Possible causes
- Remote control cable cut or poorly connected
- Reversed polarity
- Faulty remote control or indoor board
Models affected: SRK, SRC, SRFC, FDTC
This issue requires a qualified technician. Do not open the unit.
Code E2Medium severityair-to-air
Duplicate indoor unit address
Possible causes
- Two indoor units with the same address
- More units than the maximum allowed on the network
Models affected: SRK, SRC, SRFC
This issue requires a qualified technician. Do not open the unit.
Code E3Medium severityair-to-air
Outdoor unit signal line error
Possible causes
- Indoor/outdoor connection cable cut or short-circuited
- Moisture on the terminal blocks
- Incorrect outdoor unit addressing (KX)
Models affected: SRK, SRC, SRFC
This issue requires a qualified technician. Do not open the unit.
Code E8Medium severityair-to-air
Overload in heating mode
Possible causes
- Clogged air filter
- Faulty indoor coil sensor (ThI-R) or connector
- Refrigerant circuit fault
Models affected: SRC, SRFC, FDU
This issue requires a qualified technician. Do not open the unit.
Fan — Mitsubishi Heavy Industries
The fan expels or draws in heat. If it’s blocked or failing, pressure rises and triggers a shutdown.
Code E7Medium severityair-to-air
Indoor return air temperature sensor fault (ThI-A)
Possible causes
- Faulty ThI-A sensor
- Damaged sensor wiring
- Faulty indoor board
Models affected: SRC, FDU, FDCVA
This issue requires a qualified technician. Do not open the unit.
Code E9Medium severityair-to-air
Condensate drain fault (float switch)
Possible causes
- Failed condensate pump
- Blocked drain
- Open float switch or disconnected connector
Models affected: SRK, SRC, SRFC, FDTC
This issue requires a qualified technician. Do not open the unit.
All Mitsubishi Heavy Industries codes published on the site
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Technical information provided for reference only, compiled from manufacturer documentation and field reports. It does not replace the diagnosis of a qualified professional. Found an error on this page? Report it.