Viessmann Vitodens 200-W B2KH-32 Fault codes & diagnostics

12 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

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Download the Viessmann Vitodens 200-W B2KH-32 manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

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11 High 1 Medium
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Fault codes

All 12 documented codes

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A.11

The boiler has noticed the water pressure in your central heating system has drifted outside its normal range, which is usually a simple top-up issue but can stop the heating working if left.

Medium DIY-safe £0-400

What to check first

  1. Check the pressure gauge on the front of the boiler with the system cold. On most Vitodens models it should read roughly 1 to 1.5 bar, and the boiler's manual gives the exact range.
  2. If the reading is below the range, top it up using the filling loop as described in the Viessmann user manual. Close the valves afterwards and make sure the loop is fully disconnected.
  3. Watch the gauge over the next day or two. If the pressure keeps dropping, or you see damp patches, drips or water around radiators or the boiler, stop and call a Gas Safe registered engineer to find the leak.
  4. If the pressure rises above the range, do not open any valves to release water. Turn the boiler off and call a Gas Safe engineer, as this can point to an expansion vessel or pressure relief valve fault.

Parts commonly replaced

  • Expansion vessel
  • Pressure relief valve
  • Filling loop
  • Pressure sensor

Related codes

Full explanation for A.11
F.59

Your boiler's ventilation fan isn't starting up, so it has stopped itself as a safety precaution, and it will need a qualified engineer to check it.

High Engineer only £200-400

What to check first

  1. Check the boiler is getting power: make sure the switch on the wall (fused spur) and any isolator near the boiler are turned on.
  2. Check the display for a power or standby light, and confirm the boiler is switched on at its own on/off control.
  3. Wait about 10 minutes, then press the reset button once on the boiler's control panel to see if it restarts.
  4. If the fault returns or the boiler does not restart, stop and call a Gas Safe registered engineer. Do not open the boiler casing.

Parts commonly replaced

  • Fan assembly
  • Fan connection cable or harness
  • Mains power cable to fan
  • Main control PCB (if the fan is fine but the board is not sending power)

Related codes

Full explanation for F.59
F.62

Your boiler has stopped because it could not finish setting up how it burns gas safely, which usually happens when it is not getting rid of its heat properly, and it often clears after a reset once the cause is sorted.

High DIY-safe £90-250

What to check first

  1. Check the pressure gauge on the front of the boiler. It should read about 1 to 1.5 bar when cold. If it is below 1 bar, top it up using the filling loop, then close the loop valves.
  2. Bleed your radiators with a radiator key, starting with the lowest one in the house, to remove trapped air. Check the pressure again afterwards and top up if needed.
  3. Make sure the boiler is not blocked and that nothing is stored against it or covering its vents, and that the flue outlet is clear.
  4. Press the reset button on the boiler (or hold it as your model's manual describes) and wait a few minutes for it to restart. If the code returns, call a Gas Safe registered engineer.

Parts commonly replaced

  • Combustion fan
  • Gas valve
  • Heat exchanger (cleaning or replacement)

Related codes

Full explanation for F.62
F.346

Your boiler has stopped because it could not correctly set up how it burns gas, so it has shut down as a safety precaution, and a qualified engineer should look at it.

High Engineer only £120-300

What to check first

  1. Check the boiler pressure gauge on the front panel. If it is below about 1 bar, top it up using the filling loop as shown in the manual, then check it again later.
  2. Check that the flue outlet outside the house is clear of leaves, nests, snow or other blockages, and that nothing is covering it.
  3. Press and hold the reset button or use the reset option on the display once. If the code returns, stop and call a Gas Safe registered engineer. Do not keep resetting it.

Parts commonly replaced

  • Ionisation electrode
  • Burner gauze gasket
  • Flue gas recirculation seal

Related codes

Full explanation for F.346
F.357

Your boiler has stopped because it isn't getting the gas pressure it needs to light safely, so it isn't providing heating or hot water until a qualified engineer checks the gas supply.

High Engineer only £90-250

What to check first

  1. Check that your gas meter supply is on and that other gas appliances, such as the hob, are working. If they aren't, contact your gas supplier.
  2. Press the reset button on the boiler once, wait 10 minutes, and see whether it restarts. Do not repeat this more than once.
  3. If the fault returns, or if you smell gas at any point, turn off the gas at the meter, open windows, leave the property, and call the National Gas Emergency number on 0800 111 999. Otherwise, book a Gas Safe registered engineer.

Parts commonly replaced

  • Gas valve (gas block)
  • Gas pressure switch
  • Gas filter

Related codes

Full explanation for F.357
F.359

Your boiler is failing to light its burner, so it has stopped producing heat and hot water until a qualified engineer checks it.

High Engineer only £150-400

What to check first

  1. Check that the gas supply is on: make sure the boiler's gas isolation valve (usually a lever beneath or beside the boiler) is open, and that your gas meter's emergency control valve is not turned off.
  2. Check whether other gas appliances, such as the hob or gas fire, work. If they do not, contact your gas supplier or network emergency line straight away.
  3. Try one reset: press the reset button or hold the reset option on the boiler display for a few seconds. If the code returns or the boiler fails to light again, switch it off at the isolation switch and call a Gas Safe registered engineer.
  4. Do not open the boiler casing, attempt to replace electrical or ignition parts, or repeatedly press reset, as these can create a gas or electrical safety risk.

Parts commonly replaced

  • Ignition module or burner control unit
  • Ignition electrode
  • Ionisation (flame sensor) electrode
  • Gas valve
  • Ignition lead or cable

Related codes

Full explanation for F.359
F.369

The boiler has stopped because its flame sensor is not picking up a steady flame when it lights, so it has shut itself down as a safety measure.

High Engineer only £120-250

What to check first

  1. Check the pressure gauge on the front of the boiler. It should read between 1.0 and 1.5 bar. If it is low, top it up using the filling loop as shown in the manual.
  2. Press the reset button or use the reset option on the boiler display once. Wait a few minutes to see whether the boiler restarts.
  3. If the fault returns or the boiler will not restart, stop and call a Gas Safe registered engineer. Do not open the boiler casing or attempt to adjust the burner or gas supply yourself.

Parts commonly replaced

  • Ionisation electrode
  • Burner gauze assembly gasket
  • Combustion chamber door gasket

Related codes

Full explanation for F.369
F.373

Your boiler has stopped because it is recalibrating its gas-burning settings and cannot complete the process, usually because it is not releasing heat into the water properly, which a reset and a quick check of the system can often clear.

High DIY-safe £90-220

What to check first

  1. Check the pressure gauge on the front of the boiler. It should read between 1.0 and 2.0 bar when the system is cold. If it is low, top it up using the filling loop, following the boiler manual, then close the loop valves again.
  2. Bleed your radiators with a radiator key if any are cold at the top or have trapped air, and check that the boiler's isolation valves and any system valves are fully open.
  3. Switch the boiler off at the mains and wait 10 minutes, then switch it back on and press the reset button on the display. If the fault returns within a day or two, or the boiler will not restart, stop and call a Gas Safe registered engineer.

Parts commonly replaced

  • Combustion fan
  • Gas valve
  • Ionisation electrode
  • Heat exchanger

Related codes

Full explanation for F.373
F.377

Your boiler couldn't finish setting up how it burns gas safely, so it has stopped as a precaution and will usually need a qualified engineer to check it.

High Engineer only £120-260

What to check first

  1. Check the boiler pressure on the display or gauge and top it up to the level in the manual if it is low.
  2. Make sure the flue outlet on the outside wall is clear of leaves, snow, nests or debris.
  3. Turn the boiler off at the power for a minute, switch it back on, and press reset once.
  4. If the code returns or the boiler will not restart, stop trying and call a Gas Safe registered engineer.

Parts commonly replaced

  • Ionisation electrode
  • Burner gasket
  • Burner gauze assembly
  • Flue gas recirculation valve seal

Related codes

Full explanation for F.377
F.380

The boiler started up but could not detect a steady flame, so it shut itself down as a safety precaution and will need a Gas Safe engineer to check its flame sensor and gas supply.

High Engineer only £80-180

What to check first

  1. Check that the gas supply is turned on at the meter and the boiler's gas isolation valve is open.
  2. Check that the boiler pressure gauge reads between 1.0 and 1.5 bar, topping up only if the manufacturer's filling instructions allow it.
  3. Press the reset button once, wait 10 minutes, and see if the boiler restarts. If the fault returns, stop and call a Gas Safe engineer.

Parts commonly replaced

  • Ionisation electrode
  • Ignition electrode
  • Burner gasket

Related codes

Full explanation for F.380
F.416

Your boiler has shut itself down because its burner is not igniting properly, which is often caused by a sensor being out of position or air trapped in the gas supply, so it needs a Gas Safe engineer to check it.

High Engineer only £120-300

What to check first

  1. Check that other gas appliances, such as your hob, are working, so you know the gas supply is on.
  2. Make sure the gas meter emergency control valve and any isolation valve at the boiler are fully open.
  3. Switch the boiler off at its on/off switch, wait 30 seconds, then switch it back on and press the reset button once.
  4. If the fault returns, do not keep resetting it. Leave the boiler off and contact a Gas Safe registered engineer.

Parts commonly replaced

  • Flue gas temperature sensor
  • Flue gas sensor clip or bracket
  • Gas valve
  • Gas filter

Related codes

Full explanation for F.416
F.457

Your boiler's fan isn't starting, so it can't safely run the heating or hot water until a qualified engineer checks it.

High Engineer only £200-400

What to check first

  1. Check the boiler is switched on at its isolator switch and that the boiler has not tripped at the consumer unit.
  2. Note down the exact code shown on the display and any other messages.
  3. Press the reset button on the boiler once, wait 10 minutes, then check whether the code returns. If it does, stop and call a Gas Safe registered engineer.

Parts commonly replaced

  • Fan assembly
  • Fan power and connection cable
  • Main control PCB

Related codes

Full explanation for F.457
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