Vokera Vibe Max Fault codes & diagnostics

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

Combi Natural Gas 26-30 kW 2022-present
GC Numbers 47-364-6947-364-70
Download the Vokera Vibe Max manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Severity at a glance

Each cell = one fault code. Hover to identify.
3 Emergency 13 High 1 Medium

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
47-364-69 VIBE MAX 26C 2022–present
47-364-70 VIBE MAX 30C 2022–present

All 17 documented codes

Tap any card for details

>3.0 bar

Your boiler has detected that the water pressure inside the system has become dangerously high, which can put unnecessary strain on the internal components.

High Engineer only £90-180

Parts commonly replaced

  • Pressure relief valve
  • Expansion vessel
  • Filling loop

Related codes

A10

Your boiler has stopped working because it cannot safely get rid of exhaust gases or water caused by the burning process.

Emergency Engineer only £120-250

Parts commonly replaced

  • Condensate trap
  • Flue system components
  • Gas valve
  • PCB
A11

Your boiler is unable to drain away the water it naturally creates while running, so it has stopped working to prevent internal damage.

High DIY-safe £80-150

What to check first

  1. Locate the white plastic condensate pipe running from the bottom of your boiler to an outside drain.
  2. Check the external end of the pipe for blockages like ice, debris, or vegetation.
  3. If frozen, pour warm (not boiling) water over the external pipe to melt the obstruction.

Parts commonly replaced

  • Condensate trap
  • Condensate hose

Related codes

A20

Your boiler is struggling to breathe properly because the pipe that vents fumes outside or draws in fresh air is blocked or damaged.

Emergency Engineer only £120-250

Parts commonly replaced

  • Flue assembly
  • Fan unit
  • Air pressure switch

Related codes

A30

Your boiler has detected a flame inside when it should be turned off, which means it is behaving unpredictably and needs professional attention to ensure it is safe.

Emergency Engineer only £150-300

Parts commonly replaced

  • Gas valve
  • Printed Circuit Board (PCB)
  • Flame rectification electrode

Related codes

A40

Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • Limit thermostat
  • Pump
  • Heat exchanger

Related codes

A41

Your boiler has detected that the water pressure in your heating system has dropped too low to operate safely.

High DIY-safe

What to check first

  1. Locate the external filling loop, usually found underneath the boiler.
  2. Open the small valve or tap to allow water to enter the system until the pressure gauge reads between 1.0 and 1.5 bar.
  3. Ensure the valve is turned firmly off once the correct pressure is reached.

Parts commonly replaced

  • Filling loop
  • Pressure relief valve
  • Pressure sensor
A42

Your boiler has detected that the water pressure inside your heating system is too low to operate safely, so it has shut down to protect itself.

High DIY-safe

What to check first

  1. Locate the filling loop (a flexible metal or silver braided hose) underneath the boiler.
  2. Open the valves at both ends of the loop to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.
  3. Firmly close both valves and check for any leaks.

Parts commonly replaced

  • Filling loop
  • Pressure gauge
  • Pressure relief valve

Related codes

A58

Your boiler is struggling to read the temperature of the water returning from your radiators, which prevents it from heating your home correctly.

High Engineer only £120-200

Parts commonly replaced

  • Return NTC thermistor
  • Wiring harness

Related codes

A59

Your boiler has detected that the water returning to it is much hotter than it should be, causing it to shut down to prevent damage.

High Engineer only £150-250

Parts commonly replaced

  • Return NTC sensor
  • Pump
  • Primary heat exchanger

Related codes

A60

Your boiler's sensor is struggling to accurately detect the water pressure inside the system, which causes it to stop working to protect itself from potential damage.

High Engineer only £150-250

Parts commonly replaced

  • Pressure transducer
  • Wiring harness

Related codes

A70

Your boiler is having trouble detecting the temperature of the water used for your taps and shower, so it has stopped providing hot water to prevent overheating.

High Engineer only £120-200

Parts commonly replaced

  • DHW NTC sensor

Related codes

A80

Your boiler has detected that the water returning from your radiators is either too hot or the temperature sensor is sending an incorrect reading, causing the system to stop as a safety precaution.

High Engineer only £120-220

Parts commonly replaced

  • Return NTC sensor
  • Wiring harness
A90

Your boiler has detected that the water inside the system is getting dangerously hot, so it has safely shut itself down to prevent damage.

High Engineer only £150-250

Parts commonly replaced

  • NTC temperature sensor
  • Pump
  • Heat exchanger

Related codes

A91

Your boiler has detected that the water temperature is significantly different between its inlet and outlet pipes, causing it to shut down for safety.

High Engineer only £150-250

Parts commonly replaced

  • NTC Temperature Sensor
  • Primary Heat Exchanger
  • Central Heating Pump

Related codes

FIL

Your boiler has detected that the internal components responsible for transferring heat need professional cleaning to restore efficiency.

Medium Engineer only £150-250

Parts commonly replaced

  • Heat exchanger cleaning kit
  • Gaskets
  • Seal kit

Related codes

SFS

Your boiler has detected an issue with the sensor that monitors the temperature of the gases leaving the flue, causing it to stop operating to ensure safety.

High Engineer only £120-220

Parts commonly replaced

  • Flue gas probe
  • Wiring harness

Related codes

4 operating states & engineer diagnostics

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

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