Got no power to your boiler, timer, or thermostat?
No problem. If your boiler won’t turn on, we can help.
This 5-minute guide will help to determine what the problem is, so you can get your boiler working again.
Fed up with your boiler? Get a boiler replacement quote here.
Causes Of No Power To A Boiler
#1 – Fuse Blown
To stop damaging electrical components in your boiler, manufacturers fit them with a fuse.
If there’s a surge of power, the fuse has likely blown, and this will cause your boiler to have no power. Your boiler won’t turn on without a functioning fuse.
Change the fuse, and you should get power back to your boiler.
#2 – RCD Tripped
Head over to your RCB (fuse box) and check to see all switches are in the same position.
It’s likely that the RCD has tripped. Sometimes, this will be the whole property. But, a lot of properties are “zoned”, meaning sections of the house are on different circuits.
There’s a good chance that the section of your house the boiler is in, has tripped.
It’s particularly common for an RCD to trip (meaning no power to a boiler) after a power cut, or in extremely bad weather.
#3 – Electric Meter
Are you on a pay-as-you-go electric meter? Do you have credit? If you do, there’s a chance there’s a fault with the meter.
As most electric meters are now digital, utility companies can resolve issues over the phone.
#4 – PCB (Printed Circuit Board) Failure
Getting no power to your boiler or timer? If you’ve tried everything listed above, the PCB on your boiler could have failed; it’s a common boiler problem.
The PCB communicates with other parts of your boiler (pump, valves, thermostat, timer etc) to keep your boiler operational.
A boiler engineer will be able to run a basic electrical test to see if the whole boiler has no power, or the fault is limited to the PCB.
#5 – Power Light Failure
Luckily, not all faults relating to a boiler with no power are fatal. Sometimes, it looks like a boiler has no power, but it’s a simple LED failure.
It’s a small probability, but there’s a chance the power light on your boiler has broken.
Again, a simple electrical test can determine what the problem is.
#6 – Fused Spur Broken
Most big electrical appliances will be segregated from an electrical circuit (a cooker for instance) by a fused spur. A fused spur is a socket with a little red window in it.
If your boiler is plugged into a spur and has no power, this could be the problem. A boiler won’t turn on without an active fuse in the spur.
Before spending big cash on fixing a boiler, check the fuse in the spur isn’t blown.
What To Do After Fixing A Boiler With No Power
After the problem causing the boiler’s power problem has been fixed, you’ll need to reset your boiler.
New boilers will have a reset button on the display board; this is located on the front of the boiler.
If your boiler doesn’t have a reset button visible, check your owner’s manual. Many older boilers have a reset procedure that’s not as simple as just pressing a button.
Still got problems with your boiler? Get a boiler replacement quote here.
They’ll be able to determine and fix the problem. Or, head over to our boiler problems article.
If you have any questions, leave a comment below and we’ll reply as soon as we can.