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Thread: Daikin UH fault code
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25-01-2010, 07:43 AM #1
Daikin UH fault code
After being call to a recent install of a 4MXS68 multi Daikin, the fault code UH appeared.
any ideas on the cause ?
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25-01-2010, 09:11 AM #2
Re: Daikin UH fault code
Hi I would suggest you check interconnecting wiring (crossed cable cores/piping wiring) & compatibility of outdoor/indoors.
See below info from manual.
UH error
Malfunction Decision Conditions:
- Operation halt due to the anti-icing function in other rooms
- Operation halt due to unspecified internal and/or external voltages
- Operation halt due to mismatching of indoor and outdoor units
Supposed Causes:
- Freeze protection (A5) function is active on another indoor
- Wrong connections at the indoor unit
- PCB wrongly connected
A5 error (Freeze protection)
Supposed causes:
- Wrong wiring or piping
- Ev malfunctioning in each room
- Short-circuit
- Indoor unit heat exchanger temperature thermistor abnormality
- Room temperature thermistor abnormality
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