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No Power to Boiler – Causes & Fixes

There could be a range of reasons why a boiler appears not to have power and therefore does not operate. Whilst some issues are more complex and will be costly to fix, others may be simpler and therefore can be resolved by yourself.

This article will provide some troubleshooting tips to aid the investigation of why a boiler may not have power and hopefully will help to get the heating system back up and running again.

However, if you are in any doubt in investigating the cause of no power to a boiler or are unsure of your findings it is highly recommended that a qualified heating engineer is called out.

Causes of No Power to a Boiler

There are a handful of common reasons why a boiler doesn’t have power. To eliminate some of the basic issues, try the following:

#1 A tripped or broken fuse

Often following a power cut or power surge, a safety mechanism with trip the fuse within the fuse box. The first check would be to see if there is a switch down within the fuse box, and if so, following the instructions to safely turn the switches back on. If, following turning the switchback, the power trips again, the fuse may be broken or there could be another electric fault and therefore it is always best to call in a professional electrician.

#2 No Electric Supply

Another simple check is to establish if it is just the boiler that has lost power, or other household devices as well which would indicate that there is a power supply issue. In this instance, it is also worth checking with neighbours to see if the local area is also in the same situation and if so, check if there are any notices posted on the website of the electricity network.

In addition, if the property is fitted with a prepayment meter it would be sensible to check that the meter has credit applied to enable the system to work.

The following matters are more complex and therefore for safety purposes would require a call out from a Gas Safe Registered heating engineer:

#3 A fault within the boiler’s Printed Circuit Board (PCB)

A PCB is the boiler’s brain, located inside the boiler unit itself and as such, undertakes all of the communicating and controlling tasks between the electrical components. The PCB undertakes many functions including starting processes such as turning on the fan and igniting the boiler as well as running safety checks in the background so that if a fault is detected the boiler will deliberately shut down to minimise further damage to the boiler itself and protect the property.

If the boiler diagnoses that there is a fault with the PCB, an error code may be shown within the display window of the unit. Error codes vary between different boiler makes and models and therefore it is recommended to check the boiler’s manual for the exact codes for your boiler.

If the display panel does not display anything at all, the PCB may have failed and therefore a Gas Safe engineer would need to be called out to investigate the matter.

If the PCB can be repaired the engineer will advise this and provide a quote, however often due to the time required to undertake a repair, a replacement part may be advised. Unfortunately, due to the complexity of the part, PCBs are fairly expensive bits of kit and therefore the cost of a replacement part should be reviewed against the costs of purchasing a new boiler.

#4 Internal Boiler Fuse Fault

Similar to the problem we discussed earlier, fuses can blow following a power surge, however in this case we are talking about the fuse or fuses within the boiler unit itself. A blown fuse protects other boiler components from damage from a power surge however once blown, the fuse will require replacing by a qualified Gas Safe Registered heating engineer, who will also undertake the necessary tests to ensure that all parts are working safely.

#5 LED Fault

An LED fault could falsely indicate that the boiler has no power as the display does not light up. If the LED lights have failed, a professional can replace them which would be a fairly low-cost replacement part in comparison with the PCB for example.

#5 How to Reset the Boiler

Following the matter being resolved either by yourself or by a professional heating engineer, the boiler will require to be reset. Most modern boilers have a simple, user-friendly reset button, however, if there is any doubt always refer to the boiler’s manual for specific instructions.

#6 Broken Boiler

If the no power issue was not a simple matter that could be resolved yourself, or by a reasonable quote from a Gas Safe Registered heating engineer, it may be worth considering a replacement.

It is commonly found that it is often more economical to replace the entire boiler rather than splashing out on expensive parts for an ageing boiler. A new boiler will not only provide energy savings but will also give peace of mind that you are fairly protected from breakdowns in the immediate future due to the warranty supplied with a new boiler.

There are many methods of purchasing a boiler these days, either online, via large heating companies or by local suppliers, however, it is essential that a new boiler is fitted by a Gas Safe Registered heating engineer.

No Power to Boiler Summary

During this article, we have explored a number of reasons that can result in a boiler not having or appearing to not have any power. As mentioned, a few of the possible causes can be simply checked and troubleshooted, whereas others require the assistance of a Gas Safe Registered heating engineer.

Where the fault is with a large or expensive part within an aging boiler, it may be worth considering purchasing a replacement boiler for both the benefit from the energy savings provided with a modern boiler and the peace of mind of the cover from a new warranty.