Question about Cfm Daikin R410a Split System Air Conditioner

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VRV 3 Daikin 2 pipe system. does any one know about these units would like to talk about fault finding u4 faults?

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No communication between indoor and outdoor units

Posted on Aug 12, 2012

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U4 faults is a comunication fault check 2 core wiring

Posted on Jan 21, 2011

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Code u 4 - Daikin model Rxymq48mvju


U4 Is a communication error between indoor and outdoor units.
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Daikin VRV J2


This is a fault with one of the standard compressor’s current sensors.
It occurs when the units PCB asks the compressor to run but then doesn’t recognise that the compressor is drawing any current. This can be due to a fault with the compressor contactor not coming in or a fault with either the Main PCB not giving an output to the contactor or not receiving the signal from the current sensor, or it could be a fault with the current sensor itself.

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2 Answers

Is there a reset button on daikin splits? If so where can I find it.? Fault code U4.


the fault code for daikin u2 is power supply is too low the reason for this is complexed and needs an expert to fix it




hope this helps in some way

Dec 02, 2010 | Cfm Daikin R410a Split System Air...

1 Answer

U1 fault on a dainkin vrv


phase reversal . change one of the 3 phases over.

Nov 11, 2010 | Cfm Daikin R410a Split System Air...

4 Answers

U4 System transmission between indoor and outdoor units Daikin


Sounds like an interconnecting wiring error. Check wiring connection i.e. wires are connected in right order 1 to1 2 to 2 etc. from indoor terminal board to outdoor terminal board. Also check for slack or loose connections.
Hope this helps I take the time to answer your question so please rate me

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1 Answer

Daikin air con - error code is u4


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