Code index · 5 entries
Mitsubishi AC / heat pump error codes
What does your Mitsubishi AC / heat pump error code mean? 5 codes from official Mitsubishi AC / heat pump documentation. Select a code for causes, how to fix it safely and when to call a pro. Mitsubishi manufacturer manual (PDF) (opens in a new tab) ↗.
5 of these 5 Mitsubishi AC / heat pump pages are marked call-a-pro because the source document points at gas, venting, refrigerant, high voltage or a control the manual does not leave to a homeowner. The other 0 start with a check the document describes, then say when to stop.
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Indoor coil or room thermistor fault: the sensor is shorted or open. The left lamp blinks twice, then pauses 2.5 seconds.
Indoor fan motor fault: the fan is not reporting rotation. The left lamp blinks 3 times, then pauses 2.5 seconds.
Outdoor power system fault: the compressor stopped three times for overcurrent or start-up failure within a minute of starting. The left lamp blinks 5 times.
Outdoor control fault: the inverter board or outdoor control board cannot read its memory. The left lamp blinks 7 times.
Miswiring or serial signal: the outdoor unit's serial signal was missing for 6 minutes. The left lamp blinks 0.5 second on and 0.5 second off, with no counted pause.
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Source: Mitsubishi manufacturer manual (PDF) (opens in a new tab) ↗ · Last updated