Vaillant error codes
5 documented Vaillant error codes, with meaning, probable causes and a guided diagnostic tree in the app.
HVACIQ
- F20 — Heat Exchanger Overheating / Scale Buildup
- F22 — Low Water Pressure / Pressure Switch Open
- F28 — Ignition Failure / No Flame Detected
- F33 — Flue Gas Sensor Fault / Exhaust Blockage
- F75 — Circulation Pump Fault / No Water Flow
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