E8
Mitsubishi Heavy
Mitsubishi Heavy air conditioner error E8
Meaning
Abnormality of the heat exchanger sensor input
General meaning for the brand's models, unless a model's own manual says otherwise.
Meaning
Indoor unit heat exchanger sensor [ThIR] failure (resistance of sensor is closed circuit)
General meaning for the brand's models, unless a model's own manual says otherwise.
Meaning
Overload in heating (extraordinarily high indoor heat exchanger temperature)
General meaning for the brand's models, unless a model's own manual says otherwise.
Meaning
Overload in heating (extraordinarily high indoor heat exchanger temperature); indoor unit heat exchanger sensor [ThIR] failure (resistance of sensor is closed circuit)
General meaning for the brand's models, unless a model's own manual says otherwise.
How the unit shows it
- Receiver unit Red LED: Keeps Flashing
- Indoor circuit board Red LED: Flashes Once
- Indoor circuit board Green LED: Keeps Flashing
- Outdoor circuit board Red LED: Stays Off
Causes and how to check
- 2 possible causes
- the cited manual page, and follow-up questions
No account needed to look up codes.
Guides
- Checking an air conditioner temperature sensor (thermistor)
How to check the room, coil or discharge sensor when the unit reports a sensor error: measure its resistance and compare with the exact model's table.