Viessmann Vitodens 200/222 Boilers

The boiler has detected a problem with the gas supply, specifically no or low gas pressure. This prevents the burner from igniting safely.

An open circuit has been detected at terminals 1 and L on the Multi terminal of the power pump module. This indicates a wiring issue or a problem with safety equipment connected to these terminals.

The boiler has detected that there is no boiler water circulation. This means water is not flowing properly through the heating system, which can cause overheating and prevent the boiler from operating.

The boiler's burner is blocked because there is a short circuit detected in the boiler water temperature sensor. This sensor helps the boiler regulate temperature, and a short circuit means it's not reading correctly.

The boiler's power supply voltage is below the minimum operating level, or an internal fuse has failed. This prevents the boiler from receiving adequate power to function.

The boiler's burner is blocked because the cable for the boiler water temperature sensor is broken. A damaged cable prevents the sensor from sending correct temperature readings to the boiler's control unit.

The boiler has experienced a flame failure during the stabilization phase of ignition. This indicates that the flame ignited but could not be maintained or properly detected.

The boiler's internal temperature has exceeded its set monitoring limit. This is a safety shutdown to prevent damage from overheating.

The flue gas temperature has exceeded its safety monitoring limit. This indicates a potential issue with the boiler's exhaust system or internal combustion, leading to dangerously high exhaust temperatures.

The boiler's burner is blocked because a short circuit has been detected in the flue gas temperature sensor. This sensor monitors the temperature of exhaust gases, and a short circuit can lead to incorrect readings.

The boiler's burner is blocked because the cable connected to the flue gas temperature sensor is broken. This prevents the boiler from accurately monitoring flue gas temperatures, causing a safety shutdown.

The burner is in fault mode because the ionization current detected during calibration is too high. This current is crucial for detecting the flame, and an incorrect reading indicates a combustion issue.

The burner is in fault mode because the heating water flow rate is too low during calibration. Insufficient water flow can lead to overheating and prevent the boiler from operating correctly.

The burner is in fault mode because heat transfer is too low during calibration, or the temperature limiter has activated and caused a shutdown. This indicates the boiler is not effectively transferring heat or has reached a critical temperature.

The burner is blocked due to a fault with the flame amplifier. The flame amplifier is a crucial component for detecting and confirming the presence of a flame, and a fault here prevents the boiler from operating safely.

The burner is in fault mode because the ionization current detected during calibration is too low. A low ionization current can mean the flame is not strong enough or not being properly detected.

The burner is in fault mode because the ionization current is outside the acceptable operating range. This could indicate issues with the gas supply, the gas type, or the ionization electrode itself.

The burner is in fault mode because the ionization current measured during calibration shows a significant deviation from its previous normal level. This indicates an unstable or inconsistent flame detection.

The burner is in fault mode because it repeatedly loses the flame during the calibration process. This suggests an instability in the combustion process or issues with flame detection.

The burner is in fault mode due to a parameter fault that occurred during calibration. This indicates an issue with the boiler's internal settings or configuration while trying to optimize its operation.

The burner is in fault mode due to an internal fault within the boiler's control system. This is a general error indicating a problem with the boiler's internal electronics or software.

The burner is in fault mode because there is no flame signal or a very weak flame signal detected when the burner attempts to start. This prevents the boiler from igniting safely.

The burner is in fault mode because the flame is lost almost immediately after it has successfully ignited, during the safety time. This indicates an instability or failure to maintain combustion.

The burner is in fault mode because the maximum flue gas temperature limit of 230°F (110°C) has been exceeded. This is a critical safety shutdown indicating potential overheating or restricted exhaust.

The burner is in fault mode because the fixed high limit switch has opened (activated). This safety switch trips when the boiler's internal temperature becomes excessively high, preventing damage.

The burner is in fault mode because a flame signal was already detected when the burner attempted to start. This is a safety mechanism to prevent gas ignition if a flame is falsely detected, indicating a potential sensor issue.

The burner is in fault mode because the gas valve closes too late. This is a critical safety fault as it means gas flow is not being cut off promptly, which can lead to unsafe gas accumulation.

The burner is in fault mode because the fan speed is too low during the burner start sequence. The fan is essential for proper combustion air supply and flue gas exhaust, so low speed prevents safe operation.

The burner is in fault mode because the fan is not at a standstill when it should be. This can indicate a stuck fan or a control issue, preventing the boiler from starting or operating safely.

The burner is in fault mode because either the gas valve is faulty, there's an issue with the modulation valve control, or the vent system is blocked. This impacts gas supply and exhaust, preventing safe operation.

The burner is in a fault state, and an additional fault B7 is displayed, indicating that the boiler coding card is missing. This card contains essential operational parameters for the boiler.

The burner is in fault mode due to a damaged or incorrect boiler coding card, or an issue with the main PCB (Printed Circuit Board). These components are critical for the boiler's control and operation.

The burner is in fault mode due to an internal fault or because the reset button R is blocked. This indicates a problem with the boiler's internal electronics or a physical issue with the reset mechanism.