Viessmann Vitodens 200-W B2HB
56 fault codes documented
0F — Boiler requires service
This code is only displayed in the fault history and indicates that the boiler requires professional servicing.
1A — Flow sensor 1 faulty
The burner is blocked because flow sensor 1 is faulty, which monitors the heating water flow.
1B — Flow sensor 2 faulty
The burner is blocked because flow sensor 2 is faulty, which monitors the heating water flow.
1F — Differential flow rate too large
The burner is blocked because the differential flow rate is too large, suggesting a restriction or issue within the heat exchanger.
2 — Gas supply: no/low gas pressure detected
The burner is in a hold/wait state because the boiler has detected no gas supply or low gas pressure. This is a critical operational issue.
3 — No boiler water circulation detected
The boiler has detected no water circulation, which can lead to overheating and system shutdown.
5 — Flame failure during stabilization
The boiler is in a hold/wait state because the flame failed to stabilize after ignition, indicating an issue with consistent combustion.
6 — Boiler temperature has exceeded the monitoring limit
The boiler is in a hold/wait state because its internal temperature has exceeded a safe monitoring limit, indicating potential overheating.
8 — Flue gas temperature has exceeded the monitoring limit
The boiler is in a hold/wait state because its flue gas temperature has exceeded a safe monitoring limit, possibly indicating combustion issues or a blocked flue.
10 — Short circuit on outdoor temperature sensor
The boiler is operating based on a default outdoor temperature of 32°F (0°C) because its outdoor temperature sensor has a short circuit.
18 — Outdoor temperature sensor cable broken
The boiler is operating based on a default outdoor temperature of 32°F (0°C) due to a broken cable connection to the outdoor temperature sensor.
20 — Short circuit on system flow temperature sensor (low-loss header)
The boiler is regulating without a supply temperature sensor for the low-loss header due to a short circuit in the sensor.
28 — System supply temperature sensor cable broken (low-loss header)
The boiler is regulating without a supply temperature sensor for the low-loss header because its cable is broken.
29 — Open circuit at terminals 1 and L on Multi terminal of power pump module
The boiler is in a hold/wait state due to an open circuit detected at terminals 1 and L of the power pump module's Multi terminal, indicating a connection issue.
33 — Power supply voltage below minimal operation level or internal fuse failure
The boiler is in a hold/wait state because the power supply voltage is too low for minimal operation, or an internal fuse has failed.
Fault BD — Communication error, Vitotrol remote control for heating circuit 2
The boiler is in control mode but detects a communication error with the Vitotrol remote control unit for heating circuit 2 (which has a mixing valve). This means the remote control cannot properly communicate with the boiler.
Fault BE — Communication error, Vitotrol remote control for heating circuit 3
The boiler is in control mode but detects a communication error with the Vitotrol remote control unit for heating circuit 3 (which has a mixing valve). This means the remote control cannot properly communicate with the boiler.
Fault BF — Incorrect LON communication module
The boiler is in control mode but detects an issue with the LON communication module, indicating it is incorrect or faulty. This module is essential for proper communication within the system.
No display code (dash) — Fault, burner control unit
The burner is in a fault state indicating a problem with the burner control unit itself, even without a specific fault code on the display.
Fault C1 — Communication fault with extension EA1
The boiler is in control mode but detects a communication fault with the extension EA1. This extension handles various control functions like external heating program changeover, external blocking, and external demand.
Fault C2 — Communication fault with solar control unit or Vitosolic
The boiler is in control mode but detects a communication fault with either the solar control unit or the Vitosolic. This indicates an issue with the communication line to the solar thermal system components.
Fault C3 — Communication fault with extension AM1
The boiler is in control mode but detects a communication fault with the extension AM1. This module is part of the boiler's control system, and a fault prevents proper operation.
Fault C4 — Communication fault with Open Therm extension
The boiler is in control mode but detects a communication fault with the Open Therm extension. This extension allows the boiler to communicate with Open Therm compatible thermostats or controls.
D8 — Fault reported by external extension EA1 input DE3
This control mode fault indicates that an external appliance connected to input DE3 of extension EA1 is reporting a fault.
DA — Short circuit on room temperature sensor (heating circuit 1 without mixing valve)
The boiler is operating without room temperature influence for heating circuit 1 (without a mixing valve) due to a short circuit in its room temperature sensor.
DB — Room temperature sensor shorted (heating circuit 2 with mixing valve)
The boiler is operating without room temperature influence for heating circuit 2 (with a mixing valve) because its room temperature sensor has shorted out.
DC — Short circuit on room temperature sensor (heating circuit 3 with mixing valve)
The boiler is operating without room temperature influence for heating circuit 3 (with a mixing valve) due to a short circuit in its room temperature sensor.
DD — Room temperature sensor cable broken (heating circuit 1 without mixing valve)
The boiler is operating without room temperature influence for heating circuit 1 (without a mixing valve) because its room temperature sensor cable is broken.
DE — Room temperature sensor cable broken (heating circuit 2 with mixing valve)
The boiler is operating without room temperature influence for heating circuit 2 (with a mixing valve) because its room temperature sensor cable is broken.
DF — Room temperature sensor cable broken (heating circuit 3 with mixing valve)
The boiler is operating without room temperature influence for heating circuit 3 (with a mixing valve) because its room temperature sensor cable is broken.
E0 — Fault with external LON participant
This control mode fault indicates an issue with an external device connected via the LON (Local Operating Network) bus.
E1 — Ionization current too high during calibration
The burner is in a fault mode because the ionization current detected during calibration is too high.
E2 — Heating water flow rate too low during calibration
The burner is in a fault mode because the heating water flow rate detected during calibration is too low, indicating insufficient water circulation.
Fault E3 — Insufficient heat transfer or combustion controller calibration issue
Fault E3 indicates a problem with heat transfer or an issue during the automatic calibration of the combustion controller. The boiler cannot operate correctly if heat is not being transferred efficiently or the combustion is not calibrated.
E4 — Fault, 24V supply voltage issue
The burner is blocked due to a fault with the 24V supply voltage, indicating a problem with the internal power supply for the control unit.
E5 — Fault with flame amplifier
The burner is blocked due to a fault with the flame amplifier, a critical component for detecting the flame during operation.
E7 — Ionization current too low during calibration
The burner is in a fault mode because the ionization current detected during calibration is too low.
E8 — Ionization current outside permissible range
The burner is in a fault mode because the ionization current is outside the allowed operating range.
EA — Ionization current outside permissible range during calibration (deviation too great)
The burner is in a fault mode because the ionization current during calibration deviates too greatly from its previous level, indicating an inconsistency.
Fault EB — Insufficient heat transfer or combustion controller calibration issue (burner blocked)
Fault EB signifies a problem with heat transfer or an issue during the automatic calibration of the combustion controller, leading to the burner being blocked. This means the boiler cannot operate until the issue is resolved and reset.
EC — Parameter fault during calibration
The burner is in a fault mode due to a parameter fault that occurred during the calibration process.
ED — Internal fault (control unit)
The burner is in a fault mode due to an internal fault within the boiler's control unit.
Fault EE — Ignition or gas train issue
The boiler displays Fault EE when there is an issue with ignition, the gas combination valve, or the ionization current during the startup sequence. This means the burner is not able to establish or maintain a flame.
EF — Flame lost immediately after building (during safety time)
The burner is in a fault mode because the flame is established but then immediately lost during the safety time, indicating an unstable flame.
F0 — Internal fault (control unit)
The burner is blocked due to an internal fault within the boiler's control unit.
F1 — Maximum flue gas temperature exceeded (230ºF / 110ºC)
The burner is in a fault mode because the flue gas temperature has exceeded its maximum limit of 230°F (110°C), indicating an overheating condition.
F2 — Fixed high limit switch open (activated)
The burner is in a fault mode because the fixed high limit switch has opened (activated), indicating an overheating safety shutdown.
F3 — Flame signal already present at burner start
The burner is in a fault mode because a flame signal was detected before the burner officially started, which is a safety concern.
F8 — Gas valve closes too late
The burner is in a fault mode because the gas valve did not close in time after a shutdown command, posing a safety risk.
Fault F9 — Fan failure during startup
The boiler detects a fan fault during the start-up cycle, approximately 51 seconds after the fan is supposed to begin operation. This prevents the boiler from proceeding to ignition.
FA — Fan not at standstill
The burner is in a fault mode because the fan was not completely stopped when it was supposed to be, indicating a control or mechanical issue.
FC — Gas valve faulty, modulation valve control faulty, or vent system blocked
The burner is in a fault mode due to a problem with the gas valve, its modulation control, or a blockage in the vent system.
FD — Boiler coding card is missing (with additional fault B7)
The burner is in a fault state because the boiler coding card is missing from its slot. This often occurs with an additional 'B7' fault.
FE — Damaged or incorrect boiler coding card or main PCB
The burner is in a fault mode due to a damaged or incorrect boiler coding card or an issue with the main Printed Circuit Board (PCB).
FF — Internal fault or reset button blocked
The burner is in a fault mode due to an internal fault or because the reset button 'R' is physically blocked or stuck.
Red fault indicator A flashes, '2' and 'Fault' on display — General system fault
The red fault indicator 'A' will flash, the display will show '2' blinking, and the word 'Fault' will appear. This indicates a general system fault has occurred within the boiler.