Boiler problem

[tiggerblue10]

I have a Saunier Duval combi boiler which I've had since 1999 and I have 3 timer settings for the heating to come on during the day. Earlier on I pressed the on/off button to off as it was quite warm today, but when I checked the radiators well over an hour later they were still very hot. I had to pull the lever across to the summer setting to switch it off.

Does anyone know why the on/off button wouldn't be working when I click it to off? Do I need a new boiler?!

[The Builder]

Hi Tiggs ........... I'm not clear about what the lever is. Can you give me the Model number of the boiler?

[tiggerblue10]

Hi Bob, sorry didn't see you earlier,

Its a Thelia 23. The lever goes from side to side and shows the sun on the left and a snowflake on the right.

[The Builder]

Ok Tiggs. From what I've read in the manual, when the on/off switch is set to off, the gas supply and electrical supply are shut off.
Either the gas valve isn't responding properly, or there's a fault on the circuit board so that it's not carrying out the shutting down procedure. Either way, you'll need a boiler man to check it over.
It could be something as simple as a sensor gone wrong. A gas valve wouldn't be too expensive, but a circuit board would cost £200 or more to replace. If you can get someone you can trust, he'll give an opinion as to whether it's worth repairing (just looking at the worst outcome.)

[tiggerblue10]

Thanks Bob :o)))

My dad knows a boiler man so I'll ask him to arrange a visit.