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yes it was doing the same with the old timer, this only started 3 days ago though its been working fine for the last 2 years. Even when the setting is "Constant" its turning itself on & off. i read on another thread about changing the PCB? Thanks for the advice

I replaced the mechanical clock with a new one as i read on here it was likely this was the issue, this caused it to work for an hour and since then it has been working intermittently. I have tried it on every setting with no joy. There is no error code showing up, when it turns itself off the...

Thank you for the reply, I will update post with suggested information.

With the cold weather kicking in my boiler has suddenly decided to play up (perfect timing). The issue I'm having is with the heating (hot water working perfectly), the light next to the radiator sign is no longer lighting up. I changed the mechanical clock, it worked for about an hour and...