No power to your boiler? What to check, and when to stop
A blank display and no lights usually means electricity is not reaching the boiler. A power cut, a tripped circuit at the fuse box or a switched-off fused spur are all safe for you to check. Changing the spur's fuse, or anything behind its faceplate or the boiler casing, is not. If you can smell gas, ring the National Gas Emergency Service on 0800 111 999 first.
What does it mean when there is no power to the boiler?
No power to the boiler means the display is blank, no lights show and nothing responds when you press a button or turn up the heating. Ideal Heating puts it plainly in its own help pages: “If there's no power, the boiler won't work at all.” If the supply checks out, a component inside the boiler may have failed, and that needs an engineer.
So there are two halves to this. The first half is the supply: the power to the house, the circuit at the fuse box, and the fused spur switch on the wall that feeds the boiler. Those are safe for you to check. The second half is inside the boiler, where a failed fuse, transformer or control board can stop it powering up even when the supply is fine. That half is engineer work.
No power is an electrical problem, not a gas one. But if you ever smell gas or a carbon monoxide alarm sounds, stop and call the National Gas Emergency Service on 0800 111 999 straight away.
The safe checks, in order
Work down this list. Each check sits outside the boiler, and none of them needs a tool.
- Check the rest of the house. If the lights and sockets are out too, and your neighbours are also without power, it is likely a power cut. In England, Scotland and Wales you can call 105 free to reach your local electricity network operator. In Northern Ireland, call 03457 643643.
- If you have a prepayment electricity meter, check it has credit. Ideal lists this among its first checks.
- Check the fuse box (consumer unit). Ideal's advice is: “If one of the circuit breakers is in a different position to the others, it could have tripped. Flip it back.” Do this once. If it trips again, leave it off and call a qualified electrician.
- Check the fused spur switch. This is the switched plate on the wall near the boiler, sometimes with a small indicator light. Someone may have knocked it off while cleaning or decorating. Make sure it is switched on.
- Check the boiler's own on/off control, if it has one, and that the timer or programmer has not simply been switched off.
- If the display comes back, give it a few minutes. If it lights up but shows a fault code, look up that code for your make rather than resetting over and over.
What about the fuse in the fused spur?
Many fused spurs hold a small fuse that protects the boiler's supply. A blown spur fuse gives exactly this symptom: the house is fine, but the boiler is dead. Checking that the spur is switched on is safe. Changing its fuse, or any other work on the spur, is a job for a qualified electrician.
One rule matters more than the fuse itself. A fuse that blows again is telling you something is wrong, and tracing it means testing the parts on the circuit in turn. That is a job for a Gas Safe registered engineer with a meter, not for repeated fuse changes.
Never take the faceplate off the spur, and never remove the boiler casing. The wiring behind both is live, and the inside of the boiler is a gas appliance.
No power to boiler: causes at a glance
| Likely cause | What you would notice | Who deals with it |
|---|---|---|
| Power cut | Lights and sockets are out across the house, often next door too. | Your electricity network operator. Call 105 in England, Scotland or Wales, or 03457 643643 in Northern Ireland. |
| No credit on a prepayment meter | Everything electrical in the house is off. | You, by topping up the meter. |
| Tripped circuit breaker or RCD | One switch at the fuse box sits in a different position to the others. | You can reset it once. If it trips again, a qualified electrician. |
| Fused spur switched off | The house is fine, the boiler is dead, and the spur switch is in the off position. | You, by switching it back on. |
| Blown fuse in the fused spur | The house is fine and the switch is on, but the boiler shows nothing. | A qualified electrician. Checking the switch is safe; changing the fuse is not DIY. |
| Fault inside the boiler | The supply checks out, but the boiler still will not power up, or the fuse keeps blowing. | A Gas Safe registered engineer for faults inside the casing (fuse, transformer, control board). A qualified electrician if the fault is in the wiring feeding the boiler. |
When to call an engineer or an electrician
Stop and get help if the house has power, the fuse box looks normal and the spur switch is on, but the boiler is still blank. Stop too if a breaker trips again after one reset, or if a fuse blows a second time. Those are faults, not things to keep resetting.
Which trade you need depends on where the fault is. A fault in the house wiring, the fuse box or the spur itself is a job for a qualified electrician. A fault inside the boiler, such as its internal fuse, transformer or control board, needs a Gas Safe registered engineer, because any work with the casing off happens inside a gas appliance.
You can book a one-off repair with us, or call 0333 772 6247. We work with a national network of thousands of Gas Safe registered engineers for boiler work. One-off repair visits run Monday to Friday, 09:00 to 17:00, a one-off repair carries a £95 call-out fee, and one-off repairs do not carry a workmanship guarantee. Repair costs vary with the fault, so rather than quote a figure here, our UK boiler repair cost statistics page (linked below) gathers sourced figures.
Does boiler cover include a boiler with no power?
A plan is set up for future breakdowns, so for a boiler that is dead today, book a one-off repair first. After that, Smart Plan is a service plan, not insurance, and it is modular, so you pick only the modules you want.
Where the fault sits decides which module applies. The boiler and central heating module covers the boiler itself, with parts and labour up to £500 per 12-month period if the boiler is under 7 years old, or up to £200 if it is 7 years or older. A fault in the property's fixed wiring, consumer unit or fused spur is a job for a qualified electrician rather than a boiler-module repair. The electrical module covers your fuse box (consumer unit), switches, sockets, isolation switches and the permanent wiring of your home on a supply up to 240V, up to £500 per 12-month period. It does not cover the wiring of an appliance beyond its isolation switch. For electrical jobs we work with a national network of thousands of vetted engineers and tradespeople. Cover applies only to the modules on your cover sheet.
On a cover plan, we aim to get an engineer out to you within two working days, and cover-plan call-outs run Monday to Friday, 08:00 to 18:00. A £95 call-out fee applies in defined cases, including the first 30 days of a new agreement, when cover still applies. A 12-month agreement period begins once you use a service, and the 14-day cooling-off period ends once a service is carried out.
Prefer the next one covered?
Pick a boiler module, an electrical module or both, and see your price in the online builder. Cover-plan call-outs run Monday to Friday, 08:00 to 18:00, a £95 call-out fee applies in defined cases including the first 30 days, and a 12-month agreement period begins once you use a service. A service plan, not insurance. Questions? Call 0333 772 6247.
No power to boiler FAQs
My boiler has no power. Why?
The usual causes are a power cut, a tripped circuit at the fuse box, a fused spur switch that has been turned off, or a blown fuse in the spur. If the supply is fine and the boiler is still blank, a part inside the boiler may have failed, and that needs a Gas Safe registered engineer.
What does a blank boiler display mean?
Usually that no power is reaching the boiler. If the power to the house, the fuse box and the spur switch all check out, a component within the boiler may have failed, and that needs a Gas Safe registered engineer.
Where is the fused spur for my boiler?
It is normally a switched plate on the wall close to the boiler, sometimes with a small indicator light. Check it is switched on. Never take its faceplate off, because the wiring behind it is live.
Can I change the fuse in the fused spur myself?
No. Check the spur switch is on, and leave the fuse and any work on the spur to a qualified electrician. If a replacement fuse blows again, that points to a fault that needs tracing, either in the wiring to the boiler (an electrician) or inside the boiler (a Gas Safe registered engineer).
The breaker for my boiler keeps tripping. What should I do?
Reset it once. If it trips again, leave it off and call a qualified electrician. A circuit that keeps tripping is a warning sign, not something to keep resetting.
Will my boiler work in a power cut?
Usually not. Most central heating systems need electricity to run, so the boiler stops during a power cut. Once the power is back, if the boiler is still blank, check the fuse box and the spur switch, then call an engineer.
Is a boiler with no power dangerous?
Having no power is not a gas emergency in itself. It leaves you without heating and hot water. If you smell gas or a carbon monoxide alarm sounds, call the National Gas Emergency Service on 0800 111 999 straight away.
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2nd Floor, Melrose House
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