Boiler programmer or timer not working
Not sure if this matches your problem?
Use our interactive tool — answer a few questions and get a personalised diagnosis.
Most likely cause & what to check
Check the programmer display is showing the correct time — a power cut will reset the clock on older programmers.
Check the programme settings: ensure heating is set to ON for the current time period, not TIMED or OFF.
For battery-powered programmers: replace the batteries.
Try running the heating in CONSTANT/OVERRIDE mode to check whether the boiler itself is working — if it fires up, the programmer settings are the issue.
Check all wiring connections at the back of the programmer are secure.
If the programmer display has gone blank or is showing errors, it may need replacing. Most are plug-and-play replacements and don't need an engineer.
🛠 Tools & materials you may need
🔗 Some links above are affiliate links — if you buy through them we earn a small commission at no extra cost to you. This keeps the site free.
Get a vetted local engineer to handle it — no hassle, Gas Safe registered.
Was this guide helpful?