I have a Fagor Combi Boiler model FE24E. Fault is that it will not ignite. It makes all the usual noises, clicks etc, but no flame. You can hear the ignition spark, click away during fire up, and there is a spark, but no flame.
There are two sealed chambers inside the boiler.
The larger outer one, contains the combustion chamber, heat exchanger, air fan pump at the top of the heat exchanger, electric safety thermostat and one of the water pipes. There is also a round plastic assembly which has two smallish rubber pipes coming out of it and going into the inlet and outlet flue, it also has two wires connected to it, going back to the control box, I am not sure of the function of this unit.
The smaller inner chamber is where the combustion takes place, it has two parallel probes going into it, which are the spark gap for igniting the gas. It also has another single probe positioned over the flame, with a single wire going back to the control box. The technical manual I have for the boiler is in Spanish, and they identify this single probe as a "Electrovalvula modulante" which googles out as a "Modulating Solenoid"
When I first starting working on the boiler, I thought it was an ignition spark problem, so I changed the Spark Transformer and the Spark Gap probe inside the combustion chamber, after changing these parts I thought I would fire up the boiler with the cover off the inner combsution chamber, and bingo, spark igniter sparked and the flame lit, great I thought. So I put the cover back on the inner chamber, and I thought I would give it another test, but this time it would not fire up. I could hear the spark clicking away inside the chamber, but no flame, so I took the cover off again, and it started working again? Now if I put the cover partially back on, it will fire up, but not when the cover is fully tightened up.
I would very much appreciate your help with this please, TIA
Regards Mark in Spain.