Code index · 5 entries
Fujitsu AC / heat pump error codes
What does your Fujitsu AC / heat pump error code mean? 5 codes from official Fujitsu AC / heat pump documentation. Select a code for causes, how to fix it safely and when to call a pro. Fujitsu manufacturer manual (PDF) (opens in a new tab) ↗.
5 of these 5 Fujitsu 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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Serial communication error: the indoor unit is not receiving the serial signal from the outdoor unit. The operation lamp blinks once and the timer lamp blinks once.
Room temperature sensor error: the room-temperature thermistor is open or shorted. The operation lamp blinks 4 times and the timer lamp blinks once.
Indoor fan motor error: fan speed stayed below one-third of the target for more than 56 seconds. The operation lamp blinks 5 times and the timer lamp blinks once.
Inverter error: the outdoor unit received an error from the inverter board. The operation lamp blinks 6 times and the timer lamp blinks 3 times.
4-way valve error: heat-exchanger temperature and room temperature stay too far apart for the mode. The operation lamp blinks 9 times and the timer lamp blinks 9 times.
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Source: Fujitsu manufacturer manual (PDF) (opens in a new tab) ↗ · Last updated