Vokera E058 Fault Code: Causes, Fixes & Repair Costs
What does the Vokera E058 fault code mean?
The E058 code appears when your Vokèra boiler's control board detects a problem with the incoming electrical supply — the voltage is either too low, too high, unstable, or has been interrupted. As a safety measure, the boiler restricts the ignition cycle and shuts itself down rather than attempting to fire under abnormal electrical conditions. This is a temporary fault classification, meaning it can sometimes clear once the underlying electrical issue resolves, but a recurring E058 always needs a professional assessment.
General guidance only — not a substitute for professional advice, and not certified by a Gas Safe engineer. Always have your specific appliance assessed by a qualified professional. Any gas work must be carried out by a Gas Safe registered engineer. If you smell gas or suspect carbon monoxide, leave the property and call the National Gas Emergency line on 0800 111 999.
Common causes
- Mains voltage fluctuation or power interruption Common
A brief power cut, a brownout from the grid, or a voltage spike can push the supply outside the range the boiler's control board considers safe. The boiler logs E058 and locks out the ignition cycle as a precaution. This is the most frequent trigger and is often a one-off event that a single reset resolves.
- Faulty or failing PCB Sometimes
The printed circuit board regulates and monitors the electrical supply to all boiler components. If the PCB itself is degrading — through age, heat stress, or moisture ingress — it may misread the incoming voltage or fail to handle it correctly, generating a spurious E058 even when the mains supply is perfectly normal.
- Loose or corroded internal electrical connections Sometimes
Wiring terminals inside the boiler can loosen over years of vibration and thermal cycling, or corrode in damp environments. A poor connection can cause intermittent voltage drops that the PCB interprets as a mains fault, leading to repeated E058 appearances.
- Blown fused spur or tripped consumer unit breaker Sometimes
If the dedicated fused spur supplying the boiler has blown its fuse, or the relevant circuit breaker has tripped at the consumer unit, the boiler receives no stable supply and will display an electrical fault code on restart.
- Deteriorated mains wiring to the boiler Rare
Older or damaged cable between the consumer unit and the boiler's fused spur can introduce resistance or cause intermittent interruptions. This is less common but worth considering in older properties where the original wiring has never been updated.
How to fix it
- Check your household power supply DIY safe
Confirm that other appliances in the home are working normally. If the lights or sockets are also affected, the issue is with your mains supply rather than the boiler itself — contact your energy supplier or wait for the grid fault to resolve before doing anything else.
- Inspect the boiler's fused spur and consumer unit DIY safe
Locate the fused spur switch on the wall near the boiler and make sure it is switched on. Then check your consumer unit (fuse box) to see whether any circuit breakers have tripped. If a breaker has tripped, reset it once. If it trips again immediately, do not keep resetting it — an electrician should investigate.
- Switch the boiler off at the fused spur, wait two minutes, then switch it back on DIY safe
After a power interruption, the boiler may need a full power cycle to clear the fault rather than just a button reset. Turn the fused spur off, leave it for at least two minutes to allow the PCB to discharge fully, then switch it back on and allow the boiler to restart in its own time.
- Reset the boiler using the front controls DIY safe
On most Vokèra models, press and hold the reset button (marked R) for three to five seconds until the fault display stops flashing, then release and allow the boiler to attempt a restart. On models with a mode selector dial, turn it to the OFF/RESET position and then immediately to your preferred heating mode. Attempt this no more than two or three times in total — repeated resets on a persistent fault can cause further damage.
- Call a Gas Safe registered engineer if E058 returns Gas Safe engineer
If the fault code reappears after resetting, or if it returns within a short period, the underlying cause needs professional diagnosis. An engineer will use a multimeter to verify the incoming mains voltage, inspect all internal wiring and terminal connections for signs of looseness or corrosion, and test the PCB under load. Only once the wiring and connections have been ruled out should PCB replacement be considered — a good engineer will always test thoroughly before recommending an expensive component swap.
Parts you may need
- Vokèra PCB (control board) · from £220
- Fused spur switch (13A) · from £15
- Boiler mains wiring harness · from £45
The exact spare depends on your boiler's GC number (on the data badge). Check this against the part before buying.
Typical repair cost
Expect to pay roughly £90–£350, depending on the underlying cause.
Frequently asked questions
Can I fix the Vokèra E058 fault myself?
The only homeowner-safe actions are checking your mains supply, confirming the fused spur and consumer unit are healthy, power-cycling the boiler at the fused spur, and pressing the reset button up to two or three times. Any investigation inside the boiler — testing voltage at terminals, inspecting the PCB, or replacing wiring — must be carried out by a qualified engineer. Tinkering with internal electrical components can void your warranty and create a safety hazard.
How much does it cost to fix an E058 fault on a Vokèra boiler?
Most E058 repairs fall between £90 and £350. If the fault is caused by a wiring issue or loose connection, you are typically paying for the engineer's time to diagnose and remedy it — usually within that lower range. If the PCB needs replacing, parts and labour together can push towards £350–£550. On older boilers where PCB replacements are approaching the cost of a new appliance, it is worth asking the engineer for a frank view on replacement versus repair, particularly if the boiler is already over ten years old.
Why does E058 keep coming back after I reset the boiler?
A one-off E058 following a power cut or voltage spike is usually nothing to worry about. If the code returns regularly — say, every few days or every time you run the heating — it points to an ongoing underlying problem: most commonly a weakening PCB, a loose internal connection, or persistently unstable mains voltage. Repeated resets without addressing the root cause can accelerate wear on the control board, so a recurring E058 should prompt a professional inspection sooner rather than later.
Is E058 dangerous — should I turn my boiler off completely?
E058 is an electrical supply fault, not a gas or combustion fault, so it does not carry the same immediate safety risk as a carbon monoxide or overheat alarm. The boiler has already shut itself down as a precaution. You do not need to evacuate your home, but you should avoid forcing the boiler to restart repeatedly. If you notice any burning smell, visible scorching around the boiler, or signs of electrical damage, turn the boiler off at the fused spur and contact a Gas Safe engineer promptly.