Daikin UH fault code

[frostice55]

After being call to a recent install of a 4MXS68 multi Daikin, the fault code UH appeared.

any ideas on the cause ?

[VRVIII]

After being call to a recent install of a 4MXS68 multi Daikin, the fault code UH appeared.

any ideas on the cause ?

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