Boiler controls are not working? Find out how to locate the cause

How to fix boiler controls that aren't working

Boilers are powered by a series of control mechanisms, and can be programmed to distribute heat and hot water at peak times. When working correctly, it should be possible to adjust the settings on a boiler as required.

If your boiler controls stop working unexpectedly, check the components listed below to locate the cause.

We hope that the tips on this page can help you out, but if not you can find a heating engineer close to you and he'll be able to fix the problems.


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The thermostat


If your thermostat’s old it’s possible that it may have lost accuracy over time. This can result in misread temperature settings and heat turning itself on and off.

If this is the case, a heating engineer can help by recalibrating your old thermostat or installing a new one. Complete with energy saving controls, most new thermostats help to increase energy efficiency, cutting heating bills by 10-20%.


The programmers and time switches


Hot water and heating are controllable via the timer switches found on your boiler. Ensure that these are set to the correct times and that the clock dial isn't stuck.


The electronic programmers


Check that the LCD display, circuit board electronics and other electrical components haven't failed.

If, for any reason, you need to replace the programmer, make sure you upgrade to one that has a 'universal backplate'. This will enable you to plug in a new programmer without the assistance of a heating engineer.


The radiator valve


Depending on the type of radiator valve, there are different ways to check it's in good working order:


  • Thermostatic radiator valve 

If you have a thermostatic radiator valve, which regulates the temperature of one individual radiator, simply adjust it to the heat you require.


  • Lockshield valve 

If you have a conventional lockshield valve, an isolating valve that requires a purpose-made tool to operate, remove the plastic cover and adjust the setting. You can find the correct tool at all good DIY stores.


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If you adjust the settings and no changes occur it’s likely there’s a fault with the radiator valve.


While you can replace a damaged radiator valve yourself, if you’re not confident with DIY contact your local heating engineer.

Information and other materials on this website are not intended to constitute professional advice and should not be relied upon. Please see our Terms of Use for further details.

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