Daikin RXYMQ48MVJU, VRV-S Air Cooled Eight Zone Outdoor Inverter Heat Pump - Logo
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Anonymous Posted on May 04, 2013
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Code u 4 - Daikin model Rxymq48mvju - Daikin RXYMQ48MVJU, VRV-S Air Cooled Eight Zone Outdoor Inverter Heat Pump -

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Bernice lawson

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  • Posted on Sep 05, 2021
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It happened to my mom's error code u4 after being off. I turned off the break
keep for 60 seconds and then back on. It now works.

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  • Posted on May 17, 2014
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U4 Is a communication error between indoor and outdoor units.
usually means one of the PC boards is faulty. If unit has been freshly installed check wiring between indoor and outdoor 1,2,3 are the same colours on both boards.

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