On Friday, May 7, 2021 at 1:03:08 PM UTC+1, Tim+ wrote:
alan_m wrote:
On 07/05/2021 11:56, Tim+ wrote:


I think after 14 years he very probably knows the correct sequence for
lighting. ;-). Almost certainly the thermocouple.


Not necessarily if it's a permanent pilot light that may have been on
for years and now has just extinguished.


It doesnt have a pilot light.

https://www.manualslib.com/manual/75...page=18#manual
Tim

--
Please don't feed the trolls
What they call the injector is in common parlance the pilot light the piezo electrode is simply to ignite the injector/pilot light. As the OP manages to get a spark and the pilot flame ignites but does continue to burn on release of the gas valve that points to the thermocouple not working. This might be due to incorrect positioning or a thermocouple fault. If adjusting the thermocouple does not solve the issue then it needs replacing they are not that expensive to replace with plenty suppliers of alternatives if Baxi originals are hard to come by.

Sometimes the injectors can distort the pilot flame if crud has got in them, removing one is usually straight forward, just one nut to unscrew. If you feel you need to go that far it is worth replacing it with a new one again they are not expensive. When we had a Baxi Bermuda back boiler some years back it was a matter of pennies to replace.

Richard