Viessmann Vitodens 200-W Boilers
60 fault codes documented
Connection error and triangle symbol — Problem with connection to programming unit
The display shows a 'Connection error' message along with a triangle symbol, indicating an issue with the cable or plug connecting the heat management unit (HMU) and the programming unit (HMI).
F.100 — Electronics modules connected to PlusBus not functioning (Voltage error PlusBus)
Electronics modules connected to the PlusBus are not functioning due to a voltage error on the PlusBus. This could be caused by too many devices connected or a short circuit in the wiring.
F.104 — External fault message input active
An external fault message input is active, depending on the configuration of the EM EA1 extension (DIO electronics module). This indicates an issue with a connected external device.
F.142 — Burner in a fault state (Communication error CAN bus)
The burner is in a fault state due to a communication error on the CAN bus, which means internal components are not communicating correctly. This could involve the fan unit or CAN bus connections.
F.160 — Burner in a fault state (Communication error CAN bus)
The burner is in a fault state due to a communication error on the CAN bus, which means internal components are not communicating correctly. This could involve internal or external CAN bus connections.
F.161 — Burner in a fault state (BCU data memory access error)
The burner is in a fault state indicating an error accessing the data memory of the Burner Control Unit (BCU). This can prevent the burner from storing or retrieving necessary operational data.
F.163 — Burner in a fault state (Memory access checksum error BCU)
The burner is in a fault state indicating a checksum error during memory access in the Burner Control Unit (BCU). This points to an issue with the integrity of data storage.
F.180 — Burner in a fault state (Gas pressure too low)
The burner is in a fault state because the gas pressure is too low, which prevents proper combustion. This can be due to issues with your gas supply or the gas pressure switch.
F.182 — No DHW heating (Short circuit, outlet temperature sensor)
There is no domestic hot water heating because a short circuit has been detected in the outlet temperature sensor (if installed). This sensor measures the temperature of the hot water.
F.183 — No DHW heating (Lead break, outlet temperature sensor)
There is no domestic hot water heating because a lead break (broken wire) has been detected in the outlet temperature sensor (if installed). This prevents the sensor from sending correct temperature readings.
F.184 — Burner in a fault state (Short circuit, common supply temperature sensor/high limit safety cutout)
The burner is in a fault state due to a short circuit in the common supply temperature sensor or the high limit safety cutout. This is a critical safety and operational component.
F.185 — Burner in a fault state (Lead break, common supply temperature sensor/high limit safety cutout)
The burner is in a fault state due to a lead break (broken wire) in the common supply temperature sensor or the high limit safety cutout. This prevents critical temperature readings and safety functions.
F.299 — Time/date incorrect (Real time clock setting incorrect)
The appliance display shows an incorrect time or date, indicating an issue with the real time clock setting. This can affect scheduled operations.
F.342 — No central heating, no DHW heating (Communication error, BCU burner control unit)
There is no central heating or domestic hot water due to a communication error with the Burner Control Unit (BCU). This indicates an issue with connections or the internal CAN bus.
F.372 — Burner in a fault state (Repeated flame loss during calibration)
The burner repeatedly loses its flame during the calibration process, which can prevent it from operating correctly. This may be due to electrode issues, flue system problems, or gas solenoid valve contamination.
F.373 — Burner in a fault state (Heat transfer too low during calibration)
The burner is in an error state because the heat transfer is too low during calibration, possibly due to the temperature limiter shutting down or issues with the circulation pump or diverter valve.
F.377 — Burner in a fault state (Stabilization conditions for post calibration not met)
The burner is in an error state because the stabilization conditions required after calibration were not met, possibly due to an incorrect gas type setting or an issue with the Burner Control Unit.
F.378 — Burner in a fault state (Flame loss during stabilization or operating phase)
The burner is experiencing flame loss either during the stabilization period or while operating. This can be caused by gas supply issues, flue gas recirculation, or contamination.
F.379 — Burner in a fault state (Flame signal not present or insufficient)
The burner is in an error state because the flame signal is either absent or too weak, which means the appliance cannot detect a flame, crucial for safe operation.
F.380 — Burner in a fault state (Flame loss immediately after flame formation)
The burner loses its flame immediately after it has formed, during the safety time. This can be due to gas supply issues, flue gas problems, or issues with the ionization electrode.
F.381 — Burner in a fault state (Flame loss during operating phase)
The burner loses its flame during normal operation. This can be due to gas supply issues, flue gas problems, or issues with the ionization electrode or flame body assembly.
F.382 — Burner in a fault state (Error counter has exceeded limit)
The burner has reached its limit for repeated errors, indicating an underlying issue that needs to be addressed by a qualified professional.
F.383, F.384 — Burner in a fault state (Possible contamination of gas line)
The burner is in a fault state, possibly due to contamination in the gas line, which can affect gas supply and combustion. This can also be caused by insufficient gas pressure.
F.385 — Burner in a fault state (Short circuit, ionization current signal 1)
The burner is in an error state indicating a short circuit in the ionization current signal. This is critical for flame detection and safe operation of the burner.
F.386 — Burner in a fault state (BCU burner control unit faulty)
The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.
F.387 — Burner in a fault state (Ground fault or BCU burner control unit faulty)
The burner is experiencing a fault, possibly due to a ground fault in the ionization circuit, an issue with the Burner Control Unit (BCU), or condensate backup.
F.388 — Burner in a fault state (BCU burner control unit faulty)
The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.
F.395 — Burner in a fault state (IO electrode ground fault or BCU burner control unit faulty)
The burner is in an error state, potentially caused by a ground fault in the IO electrode or a problem with the Burner Control Unit (BCU).
F.396 — Burner in a fault state (BCU burner control unit faulty)
The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.
F.399 — Burner in a fault state (IO electrode ground fault or BCU burner control unit faulty)
The burner is in an error state, potentially caused by a ground fault in the IO electrode or a problem with the Burner Control Unit (BCU).
F.400 — Burner in a fault state (BCU burner control unit faulty)
The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.
F.401 — Burner in a fault state (IO electrode ground fault or BCU burner control unit faulty)
The burner is in an error state, potentially caused by a ground fault in the IO electrode or a problem with the Burner Control Unit (BCU).
F.402 — Burner in a fault state (BCU burner control unit faulty)
The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.
F.403 — Burner in a fault state (Ionization electrode ground fault or BCU burner control unit faulty)
The burner is in an error state, potentially caused by a ground fault in the ionization electrode or a problem with the Burner Control Unit (BCU).
F.404 — Burner in a fault state (BCU burner control unit faulty)
The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.
F.405 — Burner in a fault state (Ionization electrode ground fault or BCU burner control unit faulty)
The burner is in an error state, potentially caused by a ground fault in the ionization electrode or a problem with the Burner Control Unit (BCU).
F.406, F.408, F.410 — Burner in a fault state (BCU burner control unit faulty)
The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.
F.416 — Burner locked out (Flue gas temperature sensor incorrectly positioned)
The burner has been locked out because the flue gas temperature sensor is not correctly positioned. This can prevent proper operation and is a safety measure.
F.417, F.418 — Burner in a fault state (BCU burner control unit faulty)
The burner is in an error state because the Burner Control Unit (BCU) is faulty. This unit is essential for managing the burner's operation.
F.425 — System operating normally; calculation not working (Time synchronization failed)
The system is operating, but there's an issue with time synchronization, which means the internal clock or external time settings are incorrect.
F.430 — Normal operation; Communication error gateway
The system is operating normally, but there's a communication error with the gateway module. This can affect how the boiler communicates with other parts of the system.
F.446 — Burner in a fault state (Deviation, boiler supply temperature sensor/high limit safety cutout)
The burner is in an error state due to a deviation detected in the boiler's supply temperature sensor or the high limit safety cutout. This could mean a sensor is providing incorrect readings.
F.447, F.448 — Burner in a fault state (Deviation, ionization current signal)
The burner is in an error state, indicating a deviation in the ionization current signal. This signal is critical for the appliance's ability to detect a flame.
F.449, F.450, F.451, F.452 — Burner in a fault state (Error in scheduled program run monitoring)
The burner is in a fault state due to an error detected in the scheduled program run monitoring. This suggests an issue with the burner's internal program execution.
F.453 — Burner in a fault state (Synchronization error, sequence)
The burner is in an error state because of a synchronization error in its operational sequence. This indicates that internal burner processes are not aligning correctly.
F.454 — Burner in a fault state (Incorrect BCU software version)
The burner is in an error state because the Burner Control Unit (BCU) has an incorrect software version, which can prevent proper operation.
F.455, F.456 — Burner in a fault state (Error in program run monitoring)
The burner is in a fault state due to an error detected in the program run monitoring. This suggests an issue with the burner's internal program execution.
F.457 — Burner in a fault state (Fan sluggish or blocked)
The burner is in an error state because the fan is sluggish or blocked, which can hinder proper combustion and flue gas removal. You might hear grinding noises.
F.458 — Burner in a fault state (Faulty reset sequence)
The burner is in an error state due to a faulty or safety-relevant reset sequence, meaning the system cannot correctly reset itself after an issue.
F.463 — Burner in a fault state (Contaminated combustion air, flue gas recirculation)
The burner is in an error state due to contaminated combustion air or flue gas recirculation. Deposits on electrodes can indicate foreign bodies affecting combustion.
F.70 — Burner in a fault state (Internal error burner control unit)
The burner is in a fault state due to an internal error within the Burner Control Unit (BCU). This unit is crucial for managing the burner's operations.
F.71 — Burner in a fault state (Fan speed too low)
The burner is in a fault state because the fan speed is too low, which can impact proper combustion and flue gas removal. This might be due to blockages or incorrect settings.
F.72 — Burner in a fault state (Fan idle state not reached)
The burner is in a fault state because the fan did not reach its idle state. This can indicate an issue with the fan unit itself, preventing proper operation.
F.73 — Burner in a fault state (Internal communication error)
The burner is in a fault state due to an internal communication error. This can affect the appliance's ability to operate correctly by disrupting communication between components.
F.74 — Burner locked out (Water pressure too low)
The burner is locked out, and there is no central heating or domestic hot water heating because the water pressure in the system is too low. This is a common issue that can often be resolved by topping up the system.
F.77 — Burner in a fault state (Data memory burner control unit)
The burner is in a fault state indicating an issue with the data memory of the Burner Control Unit (BCU). This can prevent the burner from storing or retrieving necessary operational data.
F.89 — No central heating and no DHW heating (Internal circulation pump blocked)
There is no central heating or domestic hot water heating because the internal circulation pump is blocked. A blocked pump cannot circulate water through the system.
F.91 — Function of affected extension in emergency mode (DIO electronics module communication error)
An affected extension is operating in emergency mode due to a communication error with the DIO electronics module. This means a component is not communicating correctly with the main unit.
F.92 — Function of the relevant electronics module in emergency mode (ADIO electronics module communication error)
A relevant electronics module is operating in emergency mode due to a communication error with the ADIO electronics module. This could be due to incorrect settings, wiring issues, or voltage problems.
F.94 — Electronics modules connected to PlusBus not functioning (Voltage error PlusBus)
Electronics modules connected to the PlusBus are not functioning due to a voltage error on the PlusBus. This could be caused by too many devices connected or a short circuit in the wiring.