Fault Codes

Listed below are the common Vokera fault codes as described by the boiler manufacturer along with a possible cause.

Vokera Boiler Fault Codes

Fault CodeFault ImageSystem Behaviour
_St N/A Autostop
_CL N/A Call for service
A01 Vokera Error Picture Ignition failure flame not sensed – internal fault
A02 Bell Limit thermostat fault
A03 Bell Fan fault
A04 Bell Insufficient system water pressure
A06 Bell Domestic how water (DHW) thermistor fault
A07 Bell Primary flow thermistor fault – temperature of water is too high.
A08 Bell Return thermistor fault – water temperature too high.
A09 Bell Flue thermistor or flue thermistor counter fault.
A11 Bell False flame
A77 Bell Low temperature thermostat fault
ADJ N/A Calibration
ACO Bell Service operation
N/A Flame Flame on
Fault CodeSystem Behaviour
P Preheating function active
P Blinking Preheating function running
Hours Stand-by
01 Failure to ignite
02 Overheat
03 Problem with fan/flue
04 Insufficient water pressure
05 Reset as described for code 01
06 Hot water thermistor open circuit
07 Primary thermistor open circuit

Vokera Mynute Boiler Error Codes

Fault CodeSystem Behaviour
AL10, AL20, AL21, AL26, AL28, AL34 Try resetting the boiler, if the fault reoccurs you need to contact a heating engineer.
AL40 Check the system’s pressure and refill if necessary. Reset the boiler, if the fault reoccurs then you need to contact a heating engineer.
AL41 Check system pressure – refill if necessary. If fault reoccurs, contact a heating engineer.
AL52, AL55, AL60, AL71,AL73, AL74, AL79 Contact a heating engineer.
AL74, AL79 Reset the boiler. If the fault reoccurs, contact a heating engineer.

Evolve Combi Evolve System Error Codes

Fault CodeSystem Behaviour
E10 Flame lockout
E011 Extraneous flame
E020 Limit thermostat
E030 Fan fault
E040 Water transducer – check system water pressure
E041 Water transducer – check system water pressure
E042 Water transducer fault
E060 Domestic hot water probe fault
4070 Fault flow sensor over temperature – flow sensor flow/return line probe differential alarm
E077 Main zone water thermostat
E080 Error with return line probe – over temperature outlet or differential alarm
E090 Flue gases over temperature probe
E091 Clean primary heat exchanger
Water pressure low
Water pressure high
Boiler board communication lost
BUS 485 communication lost
E021, E022, E023, E024, E067. E088, E097 Iono alarm
E085, E094, E095 Combustion fault/high CO
E058 Main voltage error
E065 Current modulation alarm
E086 Obstruction fumes alarm

If any of the above error codes keep appearing on your Vokera boiler contact a professional Heating Engineer


Vokèra Boiler Red Light On: Cause & Fix

Vokèra boilers with a red light, that’s either flashing or on constantly, have a fault and will most likely lock out, leaving your home without heating and hot water.

There are many potential faults that could be causing this issue and you should hire a Gas Safe engineer to diagnose and fix the fault with your Vokèra boiler. However, my guide will get you closer to the reason why your Vokèra boiler is showing a red light so that your heating and hot water will work once again.

Vokèra Red Light Causes

Vokèra boilers with a constant green light and no red light means there’s nothing to worry about and your boiler will provide heating and hot water as normal. However, should you see a red light on its own or alongside the green light then there’s a potential fault with the boiler.

Below, we’ve listed the issues that can cause various sequences of light you’re likely to see on your Vokèra boiler when it’s broken.

Red Light On and Green Light Off

A constant red light on your Vokèra boiler means that the unit has gone into lockout for safety reasons. Some of the possible faults behind this include:

The boiler is overheating

The pump isn’t circulating hot water around the central heating system or to the taps when required;
Potentially harmful flue gases aren’t being expelled due to an issue with the fan.

Red and Green Lights On

If you’re seeing both red and green lights on your Vokèra boiler at the same time, whether they’re remaining on or flashing, your boiler could have one of the following problems:

  • Has been left in service mode after a recent boiler service;
  • Incorrect water pressure (either too low or too high);
  • Heating temperature sensors are faulty.

Flashing Green Light

A constant green light on your Vokèra boiler is a sign that the flame within the boiler is working, and that’s what you want to see. Should the green light start flashing, that’s when there could be an issue to worry about:

  • Faulty hot water sensor
  • Boiler in standby

How to Reset a Vokèra Boiler

A simple reset could be enough to stop your Vokera boiler from flashing red and get the unit working to heat your home and hot water again.

To reset your Vokera boiler, move the mode selector switch to the ‘OFF/RESET’ position and then move it back to either ‘hot water only’ or ‘heating and hot water’. Should this reboot get your boiler working again then you’ll know because there will be a constant green light. If not, you should hire a Gas Safe engineer to come out and take a look over your boiler.

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Graham Mitchell