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What’s wrong with my boiler not firing up? Are you facing this issue? Don’t worry—it’s usually something easy that can be fixed with a few simple steps.

Several factors can prevent your boiler from starting. Common causes include thermostats, wiring, and fuel issues. Before fixing, try to figure out the issue.

What could cause your boiler to not fire up? This article discusses frequent causes and solutions. We’ll discuss safety before fixing anything. You must figure out why your boiler not firing up and fix your boiler to get it back up and running promptly. Let’s dive into the causes and learn how to fix if boiler not firing up.

Causes for Boiler Not Firing Up

Following could be the reasons of boiler not firing up

Low/No Gas 

Check gas levels if your boiler won’t start. Without gas, the boiler can’t heat your home. Call your gas company to order delivery if you don’t have gas.

Pilot Light Out

Pilot light failure prevents boiler startup. See your boiler manual for instructions on lighting the pilot twice. Get an experienced heating engineer if you can’t relight it.

Thermostat Issues

A broken thermostat might also prevent a boiler from starting. A broken thermostat cannot turn on the boiler. See the boiler handbook for thermostat reset instructions. If the reset fails, call a registered engineer.

Electrical Problems

Electricity problems can stop your boiler. Control board or wire issues are another option. If you have an electrical problem, call an experienced electrician for help diagnosing and fixing it.


If your boiler has a blockage issue, the air and gas needed to light the burner might not be able to reach it. You can try to clear out any blockages yourself, but if you fail, you should get help from a trained heating engineer.

causes of the boiler not firing up.

Try These Easy Fixes If Your Boiler Not Firing Up Before Calling an Engineer

You can do certain fixes by yourself to get it working again. If your boiler not firing up, try these tips:

Check the basics

Make sure that your prepayment metre has enough money in it. Inquire to see if any other gas-powered items are all set. Check the switches in the fuse box to make sure they are not broken.

Reprogramme in case of power cuts

If you recently lost power, the boiler’s timer probably reset itself. Setting it back to your time zone is all you need to do to get it to work again.

Check the pressure gauge

Find the pressure gauge on your boiler and check the number of bars. The pressure is low if it shows less than one bar. The boiler will start up again if you raise the pressure. If the number is less than 1, the water pressure is too low. To put air back on the boiler, find the loop that fills with water. It’s usually near the bottom of the unit. Make sure the boiler is turned off before you change the pressure. When you open the valve, you’ll hear water coming into the system. The pressure gauge should go up after this. When the pressure gets to 1.5, shut the valve. Now turn on the boiler.

Increase the thermostat

If the temperature on the thermostat is below 21 degrees, the boiler might not heat your home anymore. It should work again after you raise the temperature above 21 degrees.

Reset the boiler

A gadget may only need to be reset from time to time if nothing is breaking down or not working right. The device only needs to be put to sleep for a short time. Wait for 60 seconds, and then turn off the power. Activate it. The boiler needs to work again.

Bleed the radiators

Turn off the central heating system before you start this fix. Each and every radiator needs to be cool. Connect it to the valve with the radiator key. Use a piece of cloth to slowly turn the key anticlockwise. You’ll hear something moving. This means the radiator is letting gas out. Put the valve back in place when you’re done.

Call the Gas Safe Registered Engineer

Boiler fixes are not easy. You can’t always start the boiler using these simple fixes. Imagine you’ve done everything and your boiler still won’t light. Don’t touch the boiler or other heating system parts. Maybe you need professional help when your boiler not firing up.

Call a Gas Safe registered engineer when you find the following problems:

Pressure Issues

Pressure makes boilers work. Pressure must be adjusted for the boiler to work properly.

Low pressure prevents the boiler from heating water for the home. Overpressure prevents your boiler from heating water completely. Just press its sections. If your boiler isn’t working due to pressure, the pressure gauge can tell you. The temperature shouldn’t be below or above the green zone or in the red zone when the boiler is off.

Water Leaks

The pressure starts to drop when there is a leak in the boiler or heating system. Look for water that is dripping under the boiler and lines.

No Power at All

If you’ve reset the boiler more than once and it still won’t work, it’s probably because of the electricity issue. The circuit board is lying down. This is something you can’t fix by yourself. You will need to call an engineer to look at the boiler and figure out what’s wrong.

Don’t Try to Fix the Boiler Yourself

You might want to get your tools out and mess around with the boiler. Finding a trusted engineer can take a lot of time, so people try to fix the problem themselves.

If you try to fix the boiler yourself, you might make things worse. It can injure people in some situations. Stay away from it at all costs because of these reasons:

  • It is not always safe to use a gas boiler. Fixing gas appliances is illegal without a gas-safe certification. Unchecked attempts can cause gas leaks, carbon monoxide exposure, and even fires. DIY fixes are unsafe for you and your family.
  • It voids the boiler’s guarantee and home insurance. Boilers have a guarantee from the company that made them. Almost all of us have home insurance to get more protection. Messing with the boiler is against the terms of the cover and the guarantee.
  • It’s considered working on a device even if you just open it up. Because of this, don’t try to touch the boiler’s body. To do checks, call a Gas Safety engineer.
  • There are worse things you can do to the boiler: It’s not something most of us know how to do when it comes to fixing the boiler. Because of this, it’s better to let professionals do the work.
  • Only experts know the inside of the boiler. They have worked with a wide range of boilers from different brands for many years. If you don’t know much about it, you could damage parts of the boiler or the whole unit.


Many people have problems with their boiler not firing up. There are several reasons for this. Lack of power, a problem with the temperature, or a problem with the gas supply are the most common reasons. A bypass valve, gas valve, or fan motor that doesn’t work right could sometimes be  reason of boiler not firing up. 

First, make sure the power, temperature, and gas supply are all working properly on a boiler that won’t heat. Then, check the diverter valve, gas valve, and fan motor. If any of these parts aren’t working right, replace or fix them. The last thing you should do is get help from a professional gas-safe registered engineer if none of these steps work.

If you need professional gas boiler service, contact us today. Do not wait any longer to have your boilers fixed.

The timeframe can vary depending on the workload of your chosen installer and the availability of boilers. However, once your application is approved, you can expect the installation in a few days.

Anyone who has a boiler installed before 2005 or has an inefficient boiler can qualify for a boiler grant in the UK. To meet the requirements, you must be a homeowner or private tenant of the home in the UK.

The ECO4 Scheme is a government-funded program that provides grants and funding to homeowners in Scotland, who want to install energy-saving measures in their homes. The aim of the Eco4 scheme is to help people reduce their energy consumption and save money on their energy bills.

Yes, it’s quite easy. You should regularly check that the evaporator and air intake grill are clear of leaves and other particles.

To be eligible for a first time central heating grant, you must not have prior central heating installed in your homes. Also your home’s EPC rating should be lower than D.