Vokera Mynute Vhe Fault codes & diagnostics

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

System Natural GasLPG 15-20 kW 2010-2015 Discontinued

Replaced by: Mynute iVhe

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

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

All 15 documented codes

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10

Your boiler has failed to light because it cannot detect a flame or is struggling to vent correctly.

High DIY-safe £100-280

What to check first

  1. Check if other gas appliances in your home, like a cooker, are working.
  2. Ensure your gas meter has credit if you use a pre-payment meter.
  3. Check outside to ensure the flue pipe is not blocked by debris or ice.
  4. Reset the boiler by turning the selector switch to 'OFF/RESET' and then back to 'ON'.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for 10
AL10

Your boiler has failed to light or stay lit, which is often caused by a blocked condensate pipe or a sensor detecting a problem with the ignition process.

High DIY-safe £80-250

What to check first

  1. Locate the external plastic condensate pipe and check if it has frozen in cold weather.
  2. If frozen, carefully pour warm (not boiling) water over the pipe to melt the ice.
  3. Restart the boiler by turning the mode selector switch to 'Reset' and then back to the original position.

Parts commonly replaced

  • Ignition Electrode
  • Condensate Trap
  • Gas Valve
Full explanation for AL10
AL20

Your boiler has shut down because its internal safety sensor has detected that the water temperature has risen too high.

High DIY-safe £90-180

What to check first

  1. Check that all radiator valves and boiler isolation valves are fully open
  2. Turn the selector switch to the 'OFF/RESET' position, wait five seconds, and turn it back to 'ON'
  3. Check that your system pressure is between 1 and 1.5 bar on the pressure gauge

Parts commonly replaced

  • Limit Thermostat (High Limit Stat)
  • Circulation Pump
  • NTC Temperature Sensor

Related codes

Full explanation for AL20
AL21

Your boiler has shut down because a built-in safety sensor or an external monitoring device has detected a problem that prevents the system from running safely.

High Engineer only £90-180

Parts commonly replaced

  • Condensate Pump
  • UHT thermostat
  • Wiring harness

Related codes

Full explanation for AL21
AL26

Your boiler has sensed that the water returning from your radiators is too hot, which usually means the heat isn't being transferred out of the system properly.

High DIY-safe £100-£350

What to check first

  1. Check that all radiator valves (TRVs) are fully open and not stuck.
  2. Ensure the central heating bypass valve, if visible, is open.
  3. Check that the internal pump is audible and running.

Parts commonly replaced

  • Circulation pump
  • Return NTC thermistor
  • Main heat exchanger (de-scaling)

Related codes

Full explanation for AL26
AL28

Your boiler has detected that the water coming back from your radiators is hotter than the water going out, which usually means the water isn't circulating correctly or a sensor is faulty.

High Engineer only £90-180

Parts commonly replaced

  • NTC Temperature Sensor
  • Circulation Pump
  • Printed Circuit Board (PCB)

Related codes

Full explanation for AL28
AL34

Your boiler has stopped working because it cannot correctly detect the speed of the fan responsible for clearing exhaust gases.

High Engineer only £180-350

Parts commonly replaced

  • Fan motor
  • Wiring harness
  • Main circuit board (PCB)
Full explanation for AL34
AL52

Your boiler has encountered a internal electronic communication error that is preventing it from running safely.

High Engineer only £280-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Electronic Control Unit

Related codes

Full explanation for AL52
AL55

Your boiler's main control board has been set up with incorrect configuration settings, meaning it doesn't know which specific model it is supposed to be.

High Engineer only £100-280

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Jumper Tags

Related codes

Full explanation for AL55
AL60

Your boiler's internal computer has lost its configuration settings and no longer knows which model it is supposed to be operating.

High Engineer only £90-280

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Configuration Jumper Tag

Related codes

Full explanation for AL60
AL71

Your boiler has detected an issue with the sensor that monitors the temperature of the water leaving the unit, causing it to shut down as a safety precaution.

High Engineer only £90-160

Parts commonly replaced

  • Flow NTC Thermistor
  • Wiring Harness connection

Related codes

Full explanation for AL71
AL73

Your boiler has detected a problem with the sensor that monitors the water temperature returning from your radiators, preventing the system from heating effectively.

High Engineer only £90-160

Parts commonly replaced

  • Return NTC Thermistor
  • Wiring Harness
  • Main PCB

Related codes

Full explanation for AL73
AL74

Your boiler is struggling to move water through your heating system, which means it has stopped heating your home to prevent itself from overheating.

High Engineer only £120-250

Parts commonly replaced

  • Central heating pump
  • System filter
  • Diverter valve

Related codes

Full explanation for AL74
AL79

Your boiler has shut down because it is getting too hot too quickly, usually because the water isn't moving through the system properly.

High DIY-safe £100-350

What to check first

  1. Check that your radiator valves are open and not turned to zero.
  2. Ensure your system pressure is between 1.0 and 1.5 bar on the pressure gauge.
  3. Try resetting the boiler by turning the mode selector switch to 'OFF/RESET' for a few seconds.

Parts commonly replaced

  • Circulation Pump
  • NTC Temperature Sensors
  • Main Heat Exchanger

Related codes

Full explanation for AL79
low-pressure

Your boiler has stopped working because the amount of water inside your central heating system is too low to run safely.

High DIY-safe £80-150

What to check first

  1. Locate the filling loop, which is a silver braided hose with one or two valves typically found underneath your boiler.
  2. Open the valves slowly to allow water into the system while watching the pressure gauge on the front panel.
  3. Close the valves firmly once the needle sits in the green zone, usually between 1.0 and 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Pressure relief valve
  • Expansion vessel
Full explanation for low-pressure
Status & diagnostic codes

1 operating states & engineer diagnostics

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

AF Status Your boiler has detected very cold temperatures and is automatically warming itself up to prevent the internal pipes from freezing.