Vokera boiler fault codes: what they mean and what to do

What do Vokera fault codes mean?

A Vokera fault code tells you which of the boiler's own checks has failed, and on almost every Vokera model it means the boiler has locked out and stopped rather than run on a reading it cannot trust. Get your model right first. Vokera does not use one code list across its range, and the same digits mean different things in each family.

The tables below are taken from Vokera's own installation and servicing manuals for five ranges: the Vision Combi, the Vision Plus 20S, 25S and 30S, the Synergy 25C, 30C and 35C plus the Synergy 20S, 25S and 32S, the Easi-Heat i, and the Mynute VHE. Check the badge on the front of your boiler and the model name on the data plate, then use the matching table. Read your code off the wrong list and you will chase the wrong part.

The digits collide between ranges, so the family name matters more than the number. A Vision Combi shows A01 for a failed ignition. A Vision Plus and a Synergy both show E010, but the rest of their two lists are not the same. An Easi-Heat i shows A10, and a Mynute VHE shows AL10. If your Vokera is not one of the five ranges below, the tables here do not apply to it and you should use the fault code table in your own manual.

Vokera publishes these codes in its installation and servicing manuals, free PDFs in the trade section of vokera.co.uk. Everything on this page comes from those manuals, and where the manual gives only a short label we have said so rather than filling the gap in ourselves.

Vokera Vision Combi fault codes

Two things catch people out here. There is no A05 on a Vision Combi: the manual's table runs A04 straight into A06, so any list quoting one has got it wrong. And A77 is a low temperature thermostat fault, not a flue fault. The manual merges A09's cell across both flue thermistor rows, which several online lists misread as a shifted row.

The display also shows states that are not faults at all: a purge symbol, P for preheating, a blinking P while preheating runs, a flame symbol, Hours for stand-by, and two dashes for off.

Vokera Vision Plus 20S, 25S and 30S fault codes

The Vision Plus manual adds one instruction under its own table that is worth repeating: apart from E040 and E041, the reset codes are an engineer's job. In other words, top up and reset for the two pressure codes, and call someone for the rest.

Vokera Synergy 25C, 30C, 35C and Synergy 20S, 25S, 32S fault codes

Vokera Easi-Heat i fault codes

Vokera Mynute VHE fault codes

Which Vokera codes can you safely act on yourself?

Pressure codes, plus one careful reset. On a Vision Combi the pressure code is A04, insufficient system water pressure. The manual asks for a gauge reading between 1 and 1.5 bar with the boiler off and cooled to room temperature, and it needs at least 0.5 bar to work the water pressure switch. Below that the pump and fan are held off deliberately, which is why the code shows.

The equivalents elsewhere are the codes Vokera itself labels as a system fill: E040 and E041 on the Vision Plus and Synergy, A40 and A41 on the Easi-Heat i, FIL on the Synergy and Easi-Heat i, and any Vision Plus reading below 0.6 bar. Top up with the filling loop as your own manual describes, then reset. The ignition codes, A01, A10, E010 and AL10, allow one check: try another gas appliance to confirm the gas supply is on, then reset once.

Resetting is not the same action on every Vokera. On a Vision Combi the manual says to check what action the fault code table asks for first, then allow two minutes to elapse before rotating the mode selector knob across the reset position. On a Vision Plus, a Synergy or an Easi-Heat i there is no knob for it: you press the RESET button on the control panel. On a Mynute VHE, follow the reset instructions in your own Vokera handbook.

There is a limit on how many times that works. The Vision Plus manual allows a maximum of 3 consecutive reset attempts and the Synergy manual up to 5, after which the boiler shows E099 and the button stops clearing it. At that point both manuals say to switch the electrical supply off and back on again, and to call an engineer if that does not restore it.

One correction worth making, because plenty of lists get it wrong: on a Vision Combi, A01, A02 and A03 all allow a single reset. That is what Vokera's own action column asks for, and it is what the table above says. A04 is the pressure code you can genuinely fix. Everything else on this page is engineer work, and Adj and ACO are engineer-started service modes rather than faults.

Vokera's manual warns that needing frequent resets may point to a fault, and tells you to contact your installer or Vokera Customer Services. Flue and combustion codes deserve particular respect: a Synergy E034 or E050, or the flue half of a Vision Plus E010 or an Easi-Heat i A10, all point at a blocked flue or air path, and repeatedly resetting one of those is not a safe habit on a gas appliance.

When to call a Gas Safe registered engineer

Call one if the code returns after a single reset, if it is anything other than a pressure code, or if you are topping the pressure up more than occasionally, because a system that keeps losing water has a leak somewhere. Thermistors, fans, gas valves and pressure transducers all sit inside the casing, so reaching them is not a homeowner job. On an older Vokera it is worth asking about parts availability when you book.

Safety comes before all of that. If you smell gas or suspect carbon monoxide, do not wait for an engineer. Call the National Gas Emergency Service on 0800 111 999 straight away, open the windows, avoid electrical switches and leave the property.

You can book a one-off repair with us, or call us on 0333 772 6247. One-off repair appointments run Monday to Friday, 09:00 to 17:00, a £95 call-out fee applies and is paid in advance, and one-off repairs do not carry a workmanship guarantee.

A Smart Plan boiler and central heating module is a different thing, and it is worth being clear about what it does. Cover is for future breakdowns rather than a fault your boiler is already showing, so a code on your display today counts as pre-existing and would not be covered. For that one, book a one-off repair. For the next fault, the module covers parts and labour up to £500 a year if your boiler is under 7 years old, or up to £200 a year if it is over 7, with anything above that limit paid by you.

A £95 call-out fee, paid in advance, applies in your first 30 days, for faults the plan does not cover, for no-access visits, and for early annual-service requests. Cover itself still applies from day one: those first 30 days are a call-out fee window, not a gap in cover. Cover-plan call-outs run Monday to Friday, 08:00 to 18:00, and within those hours we aim to get an engineer out to you within two working days.

Using a module starts a 12-month agreement period from the first time you use a service, and leaving early after that costs the remaining months or 75% of the outstanding balance. There is a 14-day cooling-off period, and it ends the moment a service is carried out. Smart Plan is a service plan, not insurance, so it funds covered repairs up to your limits rather than paying a cash sum. It is provided by UK Boiler Company Ltd.

Vokera fault code FAQs

Code still showing after a reset? We aim to get a Gas Safe registered engineer out to you.

Book a one-off repair for the code showing today, or set up a Smart Plan boiler and central heating module so future covered repairs are handled up to your limit. A service plan, not insurance. One-off repairs run Monday to Friday, 09:00 to 17:00 and carry no workmanship guarantee. A £95 call-out fee applies in defined cases, and cover-plan call-outs run Monday to Friday, 08:00 to 18:00.

Helpful links

• All boiler fault codes by brand
• Book a repair
• Boiler repair
• No heating? Book a repair
• Smart Plan cover modules
• Boiler & central heating cover
• Vokera manuals and literature
• Check an engineer on the Gas Safe Register