Viessmann Vitopend 111 Fault codes & diagnostics

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

Combi Natural Gas 24 kW 2006-2009 Discontinued

Replaced by: Vitodens 111-W

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Severity at a glance

Each cell = one fault code. Hover to identify.
17 High 2 Medium 5 Low
Just want the most common Viessmann Vitopend 111 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 24 documented codes

Tap any card for details

0A

Your boiler has detected a problem during the star-up sequence and has shut itself down for safety.

High DIY-safe £120-350

What to check first

  1. Press the 'Reset' button or turn the rotary selector to 'Reset' for two seconds.
  2. Ensure your gas supply is active (check other gas appliances like a hob).
  3. Check that your condense pipe has not frozen if it is currently cold weather.

Parts commonly replaced

  • Ignition electrode
  • Ionisation lead
  • Gas valve
Full explanation for 0A
0D

Your boiler has detected an internal error and has shut itself down for safety, meaning you currently have no heating or hot water.

High Engineer only £150-450

Parts commonly replaced

  • Burner Control Unit
  • Ignition Leads
  • Flame Sensing Electrode
Full explanation for 0D
1A, 1B

Your boiler has stopped working because the burner has locked out, often due to a lack of gas or a problem with the ignition system.

High Engineer only £120-450

Parts commonly replaced

  • Ionisation electrode
  • Ignition unit
  • Gas valve
  • PCB
Full explanation for 1A, 1B
1F

Your boiler has stopped working because the burner has shut down to prevent it from overheating.

High Engineer only £120-£350

Parts commonly replaced

  • Circulation pump
  • Heat exchanger
  • Temperature sensors
Full explanation for 1F
02

Your boiler has overheated and shut itself down as a safety precaution to prevent damage.

High DIY-safe £120-450

What to check first

  1. Check that all radiator valves and boiler isolation valves are fully open
  2. Press the 'Reset' button or turn the control knob to the 'Reset' position for a few seconds
  3. Ensure the system pressure is between 1.0 and 1.5 bar on the pressure gauge

Parts commonly replaced

  • Circulation Pump
  • Overheat Thermostat
  • Temperature Sensors (NTC Thermistors)
Full explanation for 02
04, 05, 06, 08

Your boiler has detected a problem with the burner system and has shut down as a safety precaution to prevent damage.

High Engineer only £120-350

Parts commonly replaced

  • Ignition Electrodes
  • Flame Ionisation Probe
  • Gas Valve
  • Burner Control Board
Full explanation for 04, 05, 06, 08
07, 09

Your boiler has detected an internal error and has shut down its burner for safety, meaning you will not have any heating or hot water.

High DIY-safe £120-350

What to check first

  1. Locate the reset button or dial on the front control panel
  2. Press or turn to the 'Reset' position for 2 to 3 seconds, then release
  3. Wait for the boiler to attempt to restart; if the code returns immediately, call a qualified engineer

Parts commonly replaced

  • Ignition electrodes
  • Ionisation probe
  • Burner control unit (PCB)
Full explanation for 07, 09
25

Your boiler is overheating and has shut itself down to prevent damage because the internal water temperature has reached a dangerously high level.

High Engineer only £180-450

Parts commonly replaced

  • Circulation pump
  • Diverter valve
  • Primary heat exchanger
  • Temperature sensor
Full explanation for 25
26

Your boiler is stuck in a self-diagnostic test mode and cannot function normally to provide heating or hot water.

High Engineer only £180-£350

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Control unit
Full explanation for 26
35

Your boiler has failed to ignite or stay running, meaning you currently have no heating or hot water because the burner is not firing.

High DIY-safe £120-350

What to check first

  1. Check if your gas supply is active (test a gas hob or check your meter credit)
  2. Press the Reset button or turn the control knob to 'Reset' for 5 seconds
  3. Ensure the system pressure is between 1 and 1.5 bar

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Ionisation Lead
Full explanation for 35
Showing 11–20 of 24
222-F

Your boiler has detected air inside the system and is automatically trying to clear it to protect the burner from overheating.

High DIY-safe £0-120

What to check first

  1. Wait for the automatic venting program to complete its cycle
  2. Check your boiler pressure gauge and top it up to 1.5 bar if it is low
  3. Ensure all radiator valves are fully open to help air move through the system

Parts commonly replaced

  • Automatic air vent
  • Circulation pump
Full explanation for 222-F
A2

Your boiler has detected that the pump is jammed or not moving water correctly, meaning the system cannot heat up safely.

High Engineer only £180-350

Parts commonly replaced

  • Circulation pump
  • Pump motor head
Full explanation for A2
A5

Your boiler has detected that the water pressure is too low for it to operate safely, causing it to stop providing heating and hot water.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (the silver flexible hose) underneath your boiler.
  2. Slowly open both taps/hand-wheels until you hear water flowing and the pressure gauge rises.
  3. Close both taps tightly once the needle reaches 1.5 bar, then reset the boiler.

Parts commonly replaced

  • Filling loop valve
  • Pressure sensor
Full explanation for A5
All Boilers

Your boiler's internal computer has encountered a memory or setting error, causing it to stop following its normal heating instructions.

High DIY-safe £120-450

What to check first

  1. Locate the reset button or dial on the front control panel.
  2. Press and hold the reset button (or turn the dial to 'Reset') for 5 seconds.
  3. Wait for the boiler to restart; if the code persists, contact a qualified engineer.

Parts commonly replaced

  • Electronic Control Unit (PCB)
  • Wiring loom connectors
Full explanation for All Boilers
Viessmann boilers

Your boiler is operating in a permanent manual control mode, likely because it has lost its connection to external thermostats or sensors.

Medium DIY-safe £100-220

What to check first

  1. Check your room thermostat has power and fresh batteries
  2. Ensure the thermostat is within wireless range of the boiler
  3. Attempt to re-pair the thermostat with the receiver module
  4. Press the reset button to clear the manual override

Parts commonly replaced

  • Room thermostat
  • Receiver module
  • PCB (Control board)
Full explanation for Viessmann boilers
Vitocrossal 200

Your boiler's internal computer has encountered a critical error or is using the wrong configuration card, causing the system to shut down for safety.

High Engineer only £180-450

Parts commonly replaced

  • Burner Control Unit
  • Electronic Coding Card
  • Ignition Electrodes
Full explanation for Vitocrossal 200
Vitocrossal 300

Your boiler has lost communication with a temperature sensor used to balance your heating system, so it is running in a backup mode to keep things working.

Low Engineer only £120-250

Parts commonly replaced

  • Flow temperature sensor (NTC)
  • Low-loss header sensor
  • Sensor wiring harness
Full explanation for Vitocrossal 300
Vitodens 100-W

Your boiler has stopped working to prevent damage because the burner is failing to ignite or detect a flame correctly.

High DIY-safe £120-350

What to check first

  1. Check if other gas appliances in your home are working to ensure your gas supply is active
  2. Ensure your pre-paid gas meter has credit
  3. Locate the reset button (usually a dial or a specific button marked 'R' or 'Reset') and hold for 2 seconds

Parts commonly replaced

  • Ignition Electrode
  • Ionisation Probe
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for Vitodens 100-W
Vitodens 200

Your boiler has stopped working because the internal fan is spinning at the wrong speed, preventing the burner from safely starting up.

High Engineer only £250-£550

Parts commonly replaced

  • Fan assembly
  • Control PCB
  • Wiring harness

Related codes

Full explanation for Vitodens 200
Vitodens 200-W

Your boiler is struggling to accurately measure the temperature of the water returning from your heating system, meaning it cannot adjust its performance efficiently.

Low Engineer only £120-220

Parts commonly replaced

  • Low-loss header temperature sensor
  • NTC thermistor
  • Wiring harness
Full explanation for Vitodens 200-W
Showing 21–24 of 24
Vitodens 222-F

Your boiler is having trouble communicating with its internal controls or sensors, which might cause your heating or hot water to behave unpredictably.

Medium DIY-safe £120-280

What to check first

  1. Locate the power switch or fused spur for the boiler
  2. Turn the power off for 60 seconds
  3. Turn the power back on and wait for the system to reboot

Parts commonly replaced

  • Outside temperature sensor
  • Electronic control PCB
  • Wiring harness
Full explanation for Vitodens 222-F
Vitotronic 050/200-H

Your boiler's frost protection mode has been triggered because the outside temperature has dropped to freezing, causing the pump to run continuously to prevent pipe damage.

Low DIY-safe £0-90

What to check first

  1. Check that outdoor sensor cables are not damaged or covered in ice
  2. Ensure your heating system pressure is between 1.0 and 1.5 bar
  3. Wait for external temperatures to rise; the message should clear automatically once the weather warms up

Parts commonly replaced

  • Outdoor temperature sensor
  • Wiring harness
Full explanation for Vitotronic 050/200-H
Vitotronic 300

Your boiler's outdoor temperature sensor has triggered an automatic frost protection mode to prevent your pipes from freezing.

Low DIY-safe £0-90

What to check first

  1. Check that the outdoor sensor is not covered by snow or ice
  2. Monitor the boiler to ensure it returns to normal operation once the 'frost' ice crystal symbol disappears
  3. Ensure your thermostat is set to a comfortable temperature to maintain heat flow

Parts commonly replaced

  • Outdoor temperature sensor
  • Sensor wiring
Full explanation for Vitotronic 300