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Verified boiler fault-code guides
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Viessmann · Vitodens 100-W combi
- Viessmann 11Lead break, collector temperature sensor
- Viessmann 12Short circuit, collector temperature sensor
- Viessmann 15Lead break, solar cylinder temperature sensor (bottom)
- Viessmann 16Short circuit, solar cylinder temperature sensor (bottom)
- Viessmann 74System pressure too low (burner locked out; internal circulation pump off; no central heating and no DHW heating)
- Viessmann 87System pressure too high (burner locked out; internal pump off; no central heating and no DHW heating)
- Viessmann 89Internal circulation pump blocked (no central heating and no DHW heating)
- Viessmann 184Short circuit, flow temperature sensor/high limit safety cut-out
- Viessmann 185Lead break, flow temperature sensor/high limit safety cut-out
- Viessmann 345Temperature limiter has responded (burner locked out, automatic enabling after appliance cool-down)
- Viessmann 352Combustion CO limit exceeded
- Viessmann 347Flue gas recirculation
- Viessmann 63Flue gas temperature limiter has responded
- Viessmann 68Flame signal is already present at burner start
- Viessmann 357Insufficient gas supply
- Viessmann 13Lead break, outside temperature sensor
- Viessmann 14Short circuit, outside temperature sensor
- Viessmann 29Lead break, low loss header sensor
- Viessmann 30Short circuit, low loss header sensor
- Viessmann 57Lead break, room temperature sensor
- Viessmann 58Short circuit, room temperature sensor
- Viessmann 75No flow rate
- Viessmann 78No communication between heat management unit and programming unit
- Viessmann 100PlusBus voltage error
- Viessmann 182Short circuit, outlet temperature sensor (if installed)
- Viessmann 299Real-time clock fault
- Viessmann 417HBMU heat management unit faulty
- Viessmann 418HBMU heat management unit faulty
- Viessmann 425Time synchronisation failed.
- Viessmann 446Deviation, heat generator flow temperature sensor/high limit safety cut-out
- Viessmann 449Error in scheduled program run monitoring
- Viessmann 451Error in scheduled program run monitoring
- Viessmann 452Error in scheduled program run monitoring
- Viessmann 453Synchronisation error, sequence
- Viessmann 454Incorrect parameter set of HBMU heat management unit.
- Viessmann 455Error in program run monitoring
- Viessmann 456Error in program run monitoring
- Viessmann 458Faulty reset sequence
- Viessmann 471System pressure sensor not available, lead break or short circuit.
- Viessmann 474Error in scheduled program run monitoring
- Viessmann 517Lead break, PlusBus cable, incorrect appliance address set, remote control faulty
- Viessmann 527Incorrect HBMU heat management unit parameter set
- Viessmann 528Incorrect HBMU heat management unit parameter set
- Viessmann 574Room temperature sensor, heating circuit 1 not available.
- Viessmann 575Lead break, room temperature sensor, heating circuit 1.
- Viessmann 576Short circuit, room temperature sensor, heating circuit 1.
- Viessmann 577Room temperature sensor, heating circuit 2 not available
- Viessmann 578Lead break, room temperature sensor, heating circuit 2.
- Viessmann 579Short circuit, room temperature sensor, heating circuit 1. This is the manual’s printed wording for code 579.
- Viessmann 980Minimum system pressure before the start of DHW heating is too low.
- Viessmann 981Minimum system pressure is too low during DHW heating.
- Viessmann 7Lead break, cylinder temperature sensor; no DHW heating
- Viessmann 8Short circuit, cylinder temperature sensor; no DHW heating
- Viessmann 59Power supply undervoltage; burner locked out, boiler circuit pump off, no central heating, no DHW heating
- Viessmann 62High limit safety cut-out has responded; burner in a fault state
- Viessmann 70HBMU heat management unit internal fault; burner in a fault state
- Viessmann 73Internal communication error; burner in a fault state
- Viessmann 77HBMU heat management unit data memory (as printed); burner in a fault state
- Viessmann 91DIO electronics module communication error; function of affected extension in emergency (fallback) mode
- Viessmann 92ADIO electronics module communication error; function of relevant electronics module in emergency (fallback) mode
- Viessmann 95OpenTherm remote control not connected; burner not operational
- Viessmann 102Error with communication module; no internet connection
- Viessmann 103Internal communication error, programming unit; normal operation
- Viessmann 104External fault message input active; depends on configuration of EM-EA1 extension (DIO electronics module)
- Viessmann 161HBMU heat management unit data memory access fault; burner in a fault state
- Viessmann 162Processor low voltage; burner in a fault state
- Viessmann 163Checksum error, data memory access, HBMU heat management unit; burner in a fault state
- Viessmann 183Lead break, outlet temperature sensor (if installed); no DHW heating
- Viessmann 364Internal fault; burner in a fault state
- Viessmann 382Fault counter has exceeded its limit; burner in a fault state
- Viessmann 544Lead break, flow temperature sensor, heating circuit 2 with mixer; emergency function operating mode, mixer closes, heating circuit pump operational
- Viessmann 545Short circuit, flow temperature sensor, heating circuit 2 with mixer; emergency function operating mode as 544
- Viessmann 738OpenTherm remote control unit connected but not configured; normal operation
- Viessmann 799Central heating circuit pump reports an electrical fault, no flow rate; no DHW heating, no central heating
- Viessmann 979Both inputs plug 96 and OpenTherm occupied and reporting heat demand; constant heat demand, set room temperature exceeded
- Viessmann 982Circulation pump, heating circuit 1 running dry; no central heating, no DHW heating
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