Viessmann Vitodens 111-W B1LF 32kW Fault codes & diagnostics

No DHW heating. Lead break, cylinder temperature sensor

No DHW heating Short circuit, cylinder temperature sensor

No solar DHW heating or central heating backup Lead break, collector temperature sensor

No solar DHW heating Short circuit, collector temperature sensor

Controls as if the outside temperature were 0 °C Lead break, outside temperature sensor

Controls as if the outside temperature were 0 °C Short circuit, outside temperature sensor

No solar DHW heating Lead break, solar cylinder temperature sensor (bottom)

No solar DHW heating Short circuit, solar cylinder temperature sensor (bottom)

Regulates without flow temperature sensor for low loss header. Lead break, low loss header sensor

Regulates without flow temperature sensor for low loss header. Short circuit, low loss header sensor

Burner in a fault state Lead break, flue gas temperature sensor

Burner in a fault state Short circuit, flue gas temperature sensor

Control mode without room influence Lead break, room temperature sensor

Control mode without room influence - Short circuit, room temperature sensor

Burner blocked, boiler circuit pump off. No central heating, no DHW heating - Power supply, low voltage

Burner in a fault state - High limit safety cut-out has responded

Burner in a fault state - Flue gas temperature limiter has responded

Burner in a fault state - Ionisation current lies outside the permissible range

Burner in a fault state - Flame signal is already present at burner start

Burner in a fault state - Ionisation current lies outside the permissible range

Burner in a fault state - HBMU heat management unit internal fault

Burner in a fault state - Fan speed too low

Burner in a fault state - Internal communication error

Burner locked out. Internal circulation pump off. No central heating and no DHW heating. - System pressure too low

Burner in a fault state

No central heating and no DHW heating

Function of affected extension in emergency mode

Function of the relevant electronics module in emergency mode

Burner off

Electronics modules connected to PlusBus not functioning

No internet connection

Control mode

Depending on configuration of EM-EA1 extension (DIO electronics module)

Burner in a fault state

Burner in a fault state

Burner in a fault state

Burner in a fault state

No DHW heating

No DHW heating

Burner in a fault state

Burner in a fault state

Burner locked out, automatic enabling after appliance cool-down. Independent restart

Ionisation current calibration error

Gas modulation valve

Air mass rate flow not detected correctly in fan unit.

Combustion CO limit exceeded

Insufficient gas supply, burner output reduced

Gas modulation valve tolerance outside permissible range

Analogue signal reference check: Flame signal is already present at burner start.

Insufficient gas supply

No ignition spark

Flame signal is not present or insufficient at burner start.

Gas valve relay contact feedback implausible (relay contact is "welded up")

Flame is lost immediately after flame formation (during safety time)

Gas valve or modulation valve will not close.

Repeated flame loss during calibration

Heat transfer too low during calibration. Temperature limiter has shut down.

Post-processing ionisation current calibration: Stabilisation conditions for post-calibration not reached

Flame loss during stabilisation or operating phase

Flame signal not present or insufficient

Flame is lost immediately after flame formation (during safety time)

Flame loss during operating phase

Fault counter has exceeded limit.

Short circuit, signal 1, ionisation current. HBMU heat management unit faulty.

HBMU heat management unit faulty

Earth fault, ionisation current. HBMU heat management unit faulty.

HBMU heat management unit faulty

IO electrode earth fault, HBMU heat management unit faulty

HBMU heat management unit faulty

IO electrode earth fault, HBMU heat management unit faulty

HBMU heat management unit faulty

IO electrode earth fault, HBMU heat management unit faulty

HBMU heat management unit faulty

Ionisation electrode earth fault, HBMU heat management unit faulty

HBMU heat management unit faulty

Ionisation electrode earth fault, HBMU heat management unit faulty

Flue gas temperature sensor is not positioned correctly

Time synchronisation failed

Deviation, heat generator flow temperature sensor/high limit safety cut-out

Synchronisation error, sequence

Incorrect HBMU heat management unit parameter set

Fan sluggish or blocked.

Contaminated combustion air, flue gas recirculation

Ionisation current too low during calibration. Differential compared to previous value not plausible.

Gas supply insufficient during calibration. Contaminated or insufficiently sized gas line.

Ionisation current too high during calibration

System pressure sensor not available, lead break or short circuit

Error in scheduled program run monitoring

Lead break, PlusBus cable, incorrect appliance address set, remote control faulty

Condensate backup in the heat cell

Lead break, flow temperature sensor, heating circuit 2 with mixer. Incorrect setting during commissioning

Short circuit, flow temperature sensor for heating circuit 2 with mixer

OpenTherm remote control unit connected but not configured

The connection to the home network could not be established

The connection to the server could not be established