Saunier Duval semia condens F24e not regulating temperature

ears · 31 Oct 2010

Hello all,
Have the above boiler installed in a property of mine that has two problems.

1- An intermittent problem when ignites for either DHW or CH boiler will stay lit for approx 8secs then cut off then relight, will do this constantly until demand turned off. Have tried new ignition module but no joy. Seems to fail rectification (sometimes)

2- If the above does not occur and remains lit, the temperature will rise until 85c then shut off then drop to 65c and begins ignition sequence again rising to 85c and so on. I have been advised that a new CTN sensor will rectify this problem?

Any ideas, Thanks

mickyg · 31 Oct 2010

could be a number of things, no point just throwing parts at it. Think your out of your depth tbh, will need a number of checks doing.

ears · 31 Oct 2010

Out of my depth??? From what part of the thread brought you to that conclusion?? I have another identical boiler so I tried the Ignition module from it to test, as it was advised by saunier tech help. As we all know they can be wrong! Just thought I'd post on here to see if any other engineers had come across similar faults on this boiler.

mickyg · 31 Oct 2010

ears said:
Out of my depth??? From what part of the thread brought you to that conclusion??

well the bit where you have no idea whether this is a flame rec problem, a circulation problem, temp measuring prob or just something random. As i said it could be anything the fault description is to vague for that type of fault. You've already fitted one expensive part which didnt need replacing now you wanna fit something else. Anything as related you cant touch anyway which it may be. the best advice i can give you is to get a competent repair engineer in.

lightning · 31 Oct 2010

ears said:
Out of my depth??? From what part of the thread brought you to that conclusion?? I have another identical boiler so I tried the Ignition module from it to test, as it was advised by saunier tech help. As we all know they can be wrong! Just thought I'd post on here to see if any other engineers had come across similar faults on this boiler.

You came onto this forum for advice and you got it,listen to mickyg he bloody knows he's stuff.

pfowen · 17 Dec 2010

Ears: did you ever get this sorted - my boiler, has just started doing the same thing. Done all the obvious checks.

mickyg · 17 Dec 2010

pfowen said:
Ears: did you ever get this sorted - my boiler, has just started doing the same thing. Done all the obvious checks.

start a new thread detailing as much info as possible including the boiler make/model, what you've already done, found etc..
The Ops problem could be completely different to yours so irrelevant what happened.

Regan7709 · 6 Feb 2014

Hi, could someone direct me to the new thread, I have the same problem too.

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Saunier Duval semia condens F24e not regulating temperature

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