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Error code reference

Daikin Air Conditioner Error Code U0

Refrigerant shortage - EEV fully open with low pressure below 14.5 psi (cooling) or suction superheat >68°F (heating) for 30 min. System continues operating.

SourceDaikin Air Conditioner - Service Manual: RZR-P, RZQ-P(9) Seriesp. 161

Daikin codesDaikin air conditioner codes
Diagnostic procedure

The full U0 procedure

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MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check if stop valve is open; verify refrigerant amount is appropriate.

SourceDaikin Air Conditioner - Service Manual: RZR-P, RZQ-P(9) Seriesp. 161

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More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented

2 manuals in the MyPros+ library document this code for Daikin air conditioner.

Models covered by the manuals that document this code

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