20 Most Recent Fujitsu 18R1 Air Conditioner - Page 6 Questions & Answers

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

get the electrician back to carry out the repairs at his cost as it is unlikely that it will be covered by warranty

Probably need to get a service tech out to look at this.

You need to get a service tech out to look at unit per manual below

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.

-For me it's no important. As long it still work good. Good luck Mai

Electronic expansion valve. If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Check power to the outdoor unit. If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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