Is the Boiler Calling for Heat?
Check that the programmer is on and the thermostat is set high enough to request heating. A boiler cannot fire for central heating if the control system is not asking it to.
Check the Pressure
Compare the displayed pressure with your manufacturer's user guide. A boiler outside its permitted pressure range may refuse to operate.
Look for a Fault Code
Record the exact code before resetting the boiler. See our boiler fault-code guide.
Is the Boiler in Lockout?
After a failed ignition attempt, many boilers enter lockout rather than continuing indefinitely.
Read our guide to boiler lockout.
Could the Condensate Pipe Be Frozen?
During freezing weather, a blocked external condensate pipe can prevent a condensing boiler from starting properly.
See how to identify a frozen condensate pipe.
Internal Ignition Faults
If safe homeowner checks do not identify the problem, possible causes may involve ignition components, flame detection, gas supply or other internal boiler controls. These are not DIY repairs.
Boiler Won't Fire Up in South Ockendon?
Boilers 4 Essex can diagnose recurring ignition and lockout faults across RM15.
Frequently Asked Questions
Why does my boiler click but not ignite?
The exact cause requires diagnosis. It may involve ignition, gas supply, flame detection or another control condition.
Can low pressure stop a boiler firing?
Some boilers will stop operating when pressure falls outside their required range.
