Vokera Maxin Fault codes & diagnostics

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

Combi Natural Gas 24-28 kW 2000-2005 Discontinued
GC Numbers 47-094-2247-094-23

Replaced by: Linea

Download the Vokera Maxin manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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.
10 High
Just want the most common Vokera Maxin faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 10 documented codes

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GREEN LED - On every 0.5-secs

Your boiler is struggling to clear exhaust fumes or draw in fresh air properly, causing the system to pause for safety.

High Engineer only £120-250

Parts commonly replaced

  • Air Pressure Switch
  • Flue fan
  • Venturi
Full explanation for GREEN LED - On every 0.5-secs
GREEN LED On every 0.5-secs

Your boiler is struggling to start up correctly or is detecting low water pressure and is currently in a temporary pause mode.

High DIY-safe £80-250

What to check first

  1. Check the pressure gauge on the front of the boiler; if it is below 1 bar, top it up to 1.5 bar using the filling loop.
  2. Restart the boiler by turning the mode selector switch to 'OFF/RESET' and then back to 'ON'.
  3. Ensure there are no obstructions in the external flue pipe (the white pipe leading outside).

Parts commonly replaced

  • Air Pressure Switch
  • Fan
  • Water Pressure Sensor

Related codes

Full explanation for GREEN LED On every 0.5-secs
Lockout

Your boiler has stopped working because it failed to light the flame, and it now needs a manual reset to try again.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Printed circuit board (PCB)
Full explanation for Lockout
RED LED - On every 0.5-secs

Your boiler has detected a critical internal error, most likely a failing temperature sensor, and has shut itself down to prevent damage.

High Engineer only £120-220

Parts commonly replaced

  • NTC Sensor
  • Printed Circuit Board (PCB)
Full explanation for RED LED - On every 0.5-secs
RED LED - Solid

Your boiler has detected that it is overheating and has automatically shut down to prevent internal damage.

High Engineer only £120-250

Parts commonly replaced

  • Limit thermostat
  • Central heating pump
  • System filter
  • Diverter valve
Full explanation for RED LED - Solid
RED LED On every 0.5-secs

Your boiler has entered a permanent lockout mode because it failed to start safely or detected a critical hardware failure.

High DIY-safe £100-350

What to check first

  1. Check that your gas pre-pay meter has credit (if applicable).
  2. Ensure your boiler pressure gauge is between 1 and 1.5 bar; top up if it is too low.
  3. Turn the mode selector dial to 'OFF/RESET' for 10 seconds, then back to the desired setting.

Parts commonly replaced

  • Primary NTC Thermistor
  • Ignition Electrode
  • PCB
  • Gas Valve
Full explanation for RED LED On every 0.5-secs
RED LED Solid

Your boiler has switched itself off because it has detected that the water inside has become too hot.

High DIY-safe £100-250

What to check first

  1. Check that all radiator valves are open to allow water to flow.
  2. Ensure the boiler pressure gauge is between 1 and 1.5 bar; top up if it is too low.
  3. Turn the mode selector switch to 'OFF/RESET' for a few seconds, then back to the heating/hot water icon.

Parts commonly replaced

  • Limit Thermostat
  • Circulation Pump
  • Heat Exchanger
Full explanation for RED LED Solid
Reset light illuminated

Your boiler has stopped working because it failed to light the flame or has reached an unsafe temperature.

High DIY-safe £100-350

What to check first

  1. Check that your gas meter has credit and the isolation valve is open.
  2. Turn the control knob to the 'Reset' position for a few seconds and then back to 'On'.
  3. Ensure your radiator valves are open and the system pressure is between 1 and 1.5 bar.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Overheat Thermostat
Full explanation for Reset light illuminated
YELLOW LED - Solid

Your boiler has identified a configuration error, which means it is stuck in a safety mode and cannot provide heating or hot water until the internal settings are corrected.

High Engineer only £120-200

Parts commonly replaced

  • PCB (Printed Circuit Board)
  • Link jumper plug
Full explanation for YELLOW LED - Solid
YELLOW LED Solid

Your boiler is stuck in a service mode typically used by engineers, meaning it may not respond to your normal heating or hot water controls.

High Engineer only £90-180

Parts commonly replaced

  • Main PCB
  • Jumper Pin JP1

Related codes

Full explanation for YELLOW LED Solid
Status & diagnostic codes

32 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

0714 Diagnostic Your boiler is failing to detect that water is moving through the system, which prevents it from turning on your heating or hot water. 0828 Diagnostic Your boiler is struggling to detect when you turn on a hot tap, which means it is failing to heat your water properly. 0870 Diagnostic Your boiler is failing to detect that you have turned on a hot water tap, which means it will not ignite to heat your water. 4250 Diagnostic Your boiler has detected an issue with the pressure relief mechanism, which is a safety device designed to release excess water if the system pressure becomes too high. 4254 Diagnostic Your boiler has detected that air is trapped inside the system, which is preventing it from circulating heat effectively. 4931 Diagnostic Your boiler is struggling to clear leftover heat after it has finished running, which is preventing it from starting up again correctly. 5298 Diagnostic Your boiler is failing to ignite the internal flame required to produce heat or hot water. 5317 Diagnostic Your boiler is failing to ignite or keep the burner running, meaning it cannot produce heat or hot water. 5351 Diagnostic Your boiler has detected a problem with the internal part that transfers heat to your water, causing the system to shut down for safety. 5356 Diagnostic Your boiler has detected an issue with its internal heating component which is preventing it from safely warming your home or water. 5911 Diagnostic Your boiler has detected that the internal fan responsible for safely removing exhaust gases is not operating correctly, so it has shut down to prevent any risk. 6025 Diagnostic Your boiler's water pump is failing to circulate heat, which means the system cannot push hot water to your radiators or taps. 6901 Diagnostic Your boiler is having trouble controlling the gas flow required to maintain a flame, which has caused it to stop heating your water and radiators. 7070 Diagnostic Your boiler is failing to detect the necessary airflow to safely ignite, meaning it has shut down to prevent unsafe operation. 7618 Diagnostic Your boiler has detected an issue with the internal fan that pushes exhaust gases out of your home, so it has safely shut down to prevent unsafe operation. 8036 Diagnostic Your boiler has detected a problem with the internal component responsible for heating your hot water, which means the system has safely shut down to prevent further damage. 8037 Diagnostic Your boiler has detected an internal issue with the component responsible for heating your hot water, which has caused it to stop working to protect the system. 8277 Diagnostic Your boiler is unable to safely control the flow of gas needed to ignite the flame, meaning your heating and hot water will not work. 8301 Diagnostic Your boiler is failing to detect the flame correctly, so it has safely shut itself down to prevent gas from building up. 8360 Diagnostic Your boiler's internal computer is failing to communicate correctly with the system, meaning it cannot safely start the burner to provide heat or hot water. 8367 Diagnostic Your boiler has detected that it is running too hot and has automatically switched itself off to prevent potential internal damage. 8478 Diagnostic Your boiler is failing to light the flame properly because the part responsible for creating the ignition spark is not working as it should. 8484 Diagnostic Your boiler's temperature sensor is providing incorrect readings, which prevents the unit from heating your water or home safely. 8809 Diagnostic Your boiler's internal sensor is struggling to accurately read the water pressure or temperature, which may cause it to stop working to protect itself. 9266 Diagnostic Your boiler's internal pressure-balancing unit is failing, which often leads to the system losing pressure or leaking water during operation. 9763 Diagnostic Your boiler is struggling to detect water movement, which usually means the valves that allow water to flow into your radiators are closed or stuck. 9764 Diagnostic Your boiler is struggling to detect or regulate the flow of cold water entering the system, which may prevent it from heating your water correctly. 9797 Diagnostic Your boiler is signalling that the gas supply tap underneath the unit is likely turned off or is not supplying enough gas to the system. GREEN LED - On every 6-secs Status Your boiler is working perfectly and is simply waiting for a command to provide heating or hot water. GREEN LED - Solid Status Your boiler is working exactly as it should and is currently fulfilling a request to provide you with heating or hot water. GREEN LED On every 6-secs Status Your boiler is in standby mode and is operating exactly as it should while waiting for a request for heating or hot water. GREEN LED Solid Status Your boiler is working normally and is currently heating your home or providing hot water as requested.