Vokera Mynute 12 HE Fault codes & diagnostics

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

Natural Gas 2006-present
GC Number 41-094-54
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16 High
Fault codes

All 16 documented codes

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10

Your boiler has failed to ignite and cannot produce heat, which could be due to a gas supply issue, a blocked exhaust pipe, or an electrical wiring error.

High DIY-safe £100-£250 Shared across the Mynute range

What to check first

  1. Check if other gas appliances, like a hob, are working to confirm your gas supply is active.
  2. Ensure your gas meter has credit and the handle is in the 'on' position.
  3. Visually check the outside flue pipe for any obvious obstructions like bird nests or debris.
  4. Try resetting the boiler by turning the control knob to the 'Reset' position let it sit for a few seconds.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 10
AL10

Your boiler has failed to start because it cannot detect a flame, likely due to a build-up of water or debris in the unit's drainage system.

High Engineer only £120-250 Shared across the Mynute range

Parts commonly replaced

  • Condensate trap
  • Ignition electrode
  • PCB
Full explanation for AL10
AL20

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

High Engineer only £120-250 Shared across the Mynute range

Parts commonly replaced

  • Limit thermostat
  • Overheat sensor
  • Pump
  • PCB

Related codes

Full explanation for AL20
AL21

Your boiler has detected an issue with an external accessory, such as a remote thermostat or programmer, which is preventing it from firing up correctly.

High Engineer only £120-250 Shared across the Mynute range

Parts commonly replaced

  • External time clock
  • Room thermostat
  • Wiring harness
  • PCB

Related codes

Full explanation for AL21
AL26

Your boiler has shut down because the water returning to it is too hot, which suggests the internal circulation system is struggling to move heat away from the boiler efficiently.

High Engineer only £120-250 Shared across the Mynute range

Parts commonly replaced

  • Pump
  • System filter
  • NTC sensor
  • Diverter valve
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 Shared across the Mynute range

Parts commonly replaced

  • Flow NTC sensor
  • Return NTC sensor
  • Circulation pump

Related codes

Full explanation for AL28
AL34

Your boiler's fan is not reporting its speed correctly to the main control unit, so the system has shut down to prevent unsafe operation.

High Engineer only £150-250 Shared across the Mynute range

Parts commonly replaced

  • Fan assembly
  • Wiring harness
  • Printed Circuit Board (PCB)
Full explanation for AL34
AL40

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.

High DIY-safe £80-120 Shared across the Mynute range

What to check first

  1. Locate the external filling loop, which is usually a silver braided hose connecting two pipes beneath the boiler.
  2. Open the valves at both ends of the hose to allow mains water into the system.
  3. Watch the pressure gauge on the front of the boiler and close the valves once the needle reaches between 1.0 and 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Pressure relief valve
  • Pressure sensor

Related codes

Full explanation for AL40
AL41

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.

High DIY-safe £80-150 Shared across the Mynute range

What to check first

  1. Locate the external filling loop, which is usually a flexible silver braided hose with one or two valves located underneath the boiler.
  2. Open the valves slowly to allow mains water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.
  3. Close the valves tightly to stop the flow and ensure no water is leaking from the connection.

Parts commonly replaced

  • Pressure relief valve
  • Expansion vessel
  • Filling loop

Related codes

Full explanation for AL41
AL52

Your boiler has detected an internal software or communication error that is preventing it from operating safely.

High Engineer only £150-350 Shared across the Mynute range

Parts commonly replaced

  • PCB
  • Wiring harness
Full explanation for AL52
AL55

Your boiler has detected an internal configuration error where a vital electronic setting is missing or incorrect, preventing the system from starting.

High Engineer only £120-250 Shared across the Mynute range

Parts commonly replaced

  • PCB (Printed Circuit Board)
  • Link wire
Full explanation for AL55
AL60

Your boiler’s internal computer has lost its configuration settings and no longer knows how to run safely.

High Engineer only £120-350 Shared across the Mynute range

Parts commonly replaced

  • Main Circuit Board (PCB)
  • Jumper Tags

Related codes

Full explanation for AL60
AL71

Your boiler has stopped working because a sensor that measures the water temperature is either disconnected or faulty, so the boiler cannot safely heat your home.

High Engineer only £120-200 Shared across the Mynute range

Parts commonly replaced

  • NTC Thermistor
  • Wiring harness
Full explanation for AL71
AL73

Your boiler is unable to read the temperature of the water returning to it, so it has safely shut down to prevent overheating.

High Engineer only £120-180 Shared across the Mynute range

Parts commonly replaced

  • Return NTC thermistor
  • Wiring harness
Full explanation for AL73
AL74

Your boiler has detected that the water inside the heating system is getting too hot too quickly, causing it to shut down to prevent damage.

High Engineer only £120-250 Shared across the Mynute range

Parts commonly replaced

  • Central heating pump
  • Plate heat exchanger
  • NTC thermistor sensors

Related codes

Full explanation for AL74
AL79

Your boiler has shut down because the internal water has become too hot or isn't circulating through the system quickly enough.

High DIY-safe £120-£350 Shared across the Mynute range

What to check first

  1. Ensure all radiator valves (TRVs) are turned to the maximum setting
  2. Check that the central heating valves underneath the boiler are fully open
  3. Check the system pressure gauge and top up to 1.5 bar if it is low
  4. Turn the boiler off and back on to attempt a reset

Parts commonly replaced

  • Circulation pump
  • NTC Temperature Sensor
  • Main Heat Exchanger (Descaling)

Related codes

Full explanation for AL79
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