Is Your Boiler Not Firing? Try These Steps

Whilst a Monday morning where your boiler won’t turn on is far from ideal, new gas and oil boilers are designed to lock down when they detect a fault. Once the fault has been corrected, knowing how to reset the boiler will help you to restore yours in no time. In this guide, we will look at why your boiler may have entered the lock mode and how to reset it again.

When Should Your Boiler Be Reset?

Most modern boilers have a safety function whereby they will turn themselves off when a problem is encountered. This is great for your safety, but this “locked out” state can leave you in a bit of a pickle with no hot water or heating.

Errors in the heating system are usually shown on your boiler display screen by the specific error code. In order for the boiler to work again, it is necessary to reset it, but before doing this, you need to ascertain what the issue is and decide if you need a heating engineer.

How To Reset Your Boiler

All boilers have a reset button, but the location will vary from device to device. If you do not see the button, check the manual that came with the boiler, this should also explain how to reset the boiler. However, generally speaking, once you find the reset button, you will need:

  • Press the button and hold it for 10 seconds
  • Wait for the boiler to turn on (this may take a few minutes)
  • Be careful not to press the button several times, as this can cause the boiler to require expensive repairs.

You will be able to tell whether the boiler has been reset because the flame will turn on, the error code will disappear, and you’ll see a green light (instead of red or orange). If the boiler doesn’t reset, then you’ll need to contact a qualified engineer, who will be able to find the fault.

Why Is My Boiler Locked?

There are several reasons why your boiler may have gone into locked mode, but some problems are more common than others.

Mains Water Pressure

If the water pressure is too low or too high, your boiler may stop working completely. You can check the water pressure by examining the pressure gauge; you should try to keep the water pressure at around 1 bar.

Misfiring Ignition

Many boilers will shut down and go into locked mode after three unsuccessful attempts at starting or igniting. There are several reasons why this can happen (for example, burner blockage, insufficient gas pressure), in cases such as this, it’s best to contact a heating engineer.

Heat Exchanger Errors

The accumulation of limescale and/or sludge on the heat exchanger stops or limits the flow of water in your heating system, resulting in the inefficient operation of your heating system, this can often sound like a kettle boiling.

After Reset, The Boiler Doesn’t Turn On

So you’ve fixed the issue, reset the boiler and are ready get the boiler working again, only it doesn’t turn on. If this is your situation, you need to take a deeper dive.

If the original fault code is not related to the boiler pressure, check the pressure gauge to see if the pressure gauge is too high or too low – the needle should be about 1 bar.

Make sure that the boiler is powered. You will be able to see just from the screen. This is especially common after power outages, and it is a good idea to check the fuse box too.

My Boiler Constantly Needs To Be Reset, What Should I Do?

Boilers that require regular reset can have a persistent issue in the system, for example:

  • Failed Pumps
  • System Leaks
  • Heat Exchanger Issue

If you find that you have to reset your boiler regularly, then it may be a signal that your boiler is already to be replaced.

Last Updated on November 6, 2021

Last Updated on November 6, 2021


Author: Indra Gupta

Indra is an in-house writer with a love of Newcastle United and all things sustainable.

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