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Fujitsu 18R1 Air Conditioner - Page 6 Questions & Answers
Fujitsu heat pump codes
Could be low discharge temp or high discharge temp. The first thing you should do is measure discharge temp of air when you have it running. You should have a 20 degree difference between room temp and supply air temp. If you do not, then have flare nuts connections checked. Most likely a small leak in connections from install.That is the first step. If low, leak gets fixed and a new charge weight in per name plate factory charge
Fujitsu timer lights flashing twice
Serial signal error meaning the outdoor is not talking to the indoor unit. It usually means a faulty inverter / controller board which will have to be replaced. Get a tech to confirm.
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