Fault Codes / Daikin / U0

VRV / Sky Air — Refrigerant shortage (low pressure / stop valve closed).

Possible causes

• Stop valve closed.
• Refrigerant loss / leak.
• Clogged pipe / EXV.

Check steps

• Check stop valves (gas & liquid) open.
• Check charge & subcooling.
• Leak test.

Affected parts

• Kältemittel

Safety note

Source: Daikin SM-TS3 (Simple Self-Diagnosis by Malfunction Code, resmi) veya VRV IV+ Service Manual (ManualsLib) — SM-TS3 p.5: 'U0 Shortage of refrigerant — Refrigerant shortage and refrigerant clogging (wrong piping), Defective thermistor, Defective low pressure sensor, Defective outdoor unit main PCB.'

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

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