Fault Codes / Viessmann

51 codes

Vitocal

• 01 — System error — control processor faulty.
• 02 — Data error in basic settings.
• 03 — Configuration error (limited/no operation).
• 05 — Refrigerant circuit fault (EEV controller).
• 07 — Refrigerant circuit — message from the refrigerant circuit controller, heat pump stage 1.
• 09 — PV energy meter — self-consumption via the photovoltaic system not possible.
• 0A — Outdoor unit fault (shuts off).
• 0B — Outdoor unit warning — outside operating limits.
• 10 — Outside temperature sensor — short circuit.
• 18 — Outside temperature sensor — open circuit.
• 20 — Secondary flow temp sensor — short circuit.
• 21 — Secondary return temp sensor — short circuit.
• 24 — Short circuit, reversible suction gas temperature sensor — in heating mode the heat pump keeps running, in cooling mode the compressor switches off.
• 25 — Short circuit, liquid gas temperature sensor — compressor switches off.
• 28 — Secondary flow temp sensor — open circuit.
• 29 — Secondary return temp sensor — open circuit.
• 2C — Open circuit, reversible suction gas temperature sensor — in heating mode the heat pump keeps running, in cooling mode the compressor switches off.
• 2D — Open circuit, liquid gas temperature sensor — compressor switches off.
• 30 — Primary flow temp sensor fault.
• 31 — Primary return temp sensor fault.
• 32 — Evaporator temperature sensor fault.
• 38 — Open circuit, primary circuit flow temperature sensor (heat pump air or brine inlet) — emergency operation using return value +3K.
• 39 — Open circuit, primary circuit return temperature sensor (heat pump air or brine outlet) — emergency operation using flow value −2K.
• 3A — Open circuit, evaporator air-inlet temperature sensor — no room heating/cooling, only defrosting possible.
• 50 — DHW tank sensor (top) fault.
• 52 — DHW tank sensor (bottom) fault.
• 60 — Buffer tank temp sensor fault.
• 70 — Room temp sensor circuit 1 fault.
• A4 — Check valve — impermissible flow/temp rise.
• A6 — Secondary pump fault.
• A8 — Heating circuit pump 1 fault.
• A9 — Compressor switched off, heating via alternative source.
• AA — Defrost aborted.
• AC — Compressor shutdown (protection).
• AF — DHW charging pump fault.
• B0 — Device ID – HP won't start or runs at reduced efficiency.
• B1 — KM-BUS communication refrigerant controller 1.
• B5 — EEPROM fault (internal memory).
• B7 — KM-BUS communication outdoor unit.
• BF — Communication module wrong/faulty.
• C2 — Power supply of KM-BUS components.
• C5 — Utility lockout – compressor off (by energy supplier).
• C9 — Safety high-pressure switch tripped, compressor off.
• CA — Primary-circuit protection – compressor off.
• CB — Minimum primary flow temp (brine inlet) undershot.
• CC — Coding plug cannot be read, HP does not start.
• D1 — Compressor — safety chain tripped.
• D3 — Low-pressure fault, compressor switches off.
• D4 — Control high-pressure fault, compressor off.
• D6 — Flow switch detects no flow, compressor off.
• E0 — E0 LON participant: 'no communication via LON with the participant' — loss of communication with a SPECIFIC LON device (identified by system/participant number), not a blanket 'no LON communication at all'.