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is boiler still under warranty? normal warranty lasts at least 2 years if so get ideal to send one of their engineers out L2 relates to flame failure either boiler has failed to ignite or boiler has not detected flame once lit
failure to ignite ignition electrode/spark generator
failure to detect lit flame detection electrode/detection lead
blocked condensate pipe or defective condensate syphonic trap
you really need an engineer to check these components
This can be caused by several things. Incorrect Gas to Air mixture in the burner air intake valve. . Debris in the gas line to the boiler. To high a gas pressure. Depending on whether you installed this unit or not, will determine if you should try to repair or troubleshoot these issues. If it was professionally installed call the company that installed it. The only one you can't troubleshoot is the gas pressure. That needs to be done by a certified gas technician.
Hope this helps steer you in the right direction to solving the problem.
You gave a good description of the boiler-- now we need to hear the clues you have observed, as it fires (or fails to fire-- or what?)
Or as the water flow-- or doesn't flow? As the cold water enters-- what does the flame do? And does the flow rate reduce as the flow gets to the divert er valve?
How old is the boiler?-- and have we been using HARD water? (Any water softener in the circuit to remove calcium and magnesium, etc.?) Do you suspect a scaling problem in the interior parts? If so-- can you circuit an acid thru the innards, to clean up the scale?
Please comment on what happens when water and gas flow-- so we can help you get to the next step.
Suggestion is correct, more than likely the heat thermostat.
Advice:just call in a local heating engineer, its not a job for you and it will be cheaper in the long run. A botch job could cost you more than just money !
If you are using LP, you will have to change the orfices and spring in the gas valve. The problem is, if the boiler is over 5yrs. old you will have a real hard time finding these parts. You could
probably change the gas valve, but probably no luck on the
With the Water heater, it is probably cheaper to replace the water heater.
The movement of the diverter valve is critical on this appliance, and is located on rear right of the boiler, when hot water is turned on, theres are two microswitches, which must break (they both close in Central heating mode), if pump is running, it is recognising the hot water demand, check microswitches are breaking, if not, it tends to be a defective servo valve (located above the water valve), or a blocked/ restricted control line (small copper tubes which connect into the servo valve)
you could have a problem with a temperature sensor. it would not be the flame sensor since it could not wait 6 mins to sense that there is flame in the unit. could be a temperature sensor problem where it is sensing a temperature which could be correct but it is sending a wrong signal to the controller to turn off the flame and start another cycle.