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

Vokera Boiler Fault Codes

Fault Code	Fault Image	System Behaviour
_St	N/A	Autostop
_CL	N/A	Call for service
A01		Ignition failure flame not sensed – internal fault
A02		Limit thermostat fault
A03		Fan fault
A04		Insufficient system water pressure
A06		Domestic how water (DHW) thermistor fault
A07		Primary flow thermistor fault – temperature of water is too high.
A08		Return thermistor fault – water temperature too high.
A09		Flue thermistor or flue thermistor counter fault.
A11		False flame
A77		Low temperature thermostat fault
ADJ	N/A	Calibration
ACO		Service operation
N/A		Flame on

Vokera Mynute Boiler Error Codes

Evolve Combi Evolve System Error Codes

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.