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Thanks for the suggestions, I've arranged for someone to come out so hopefully won't be too expensive. I'll post results.

I've checked the manual and it states that red light on solid means primary NTC open/short circuit. What does this mean in laymans terms? Thanks

Hi tony, We've checked and the boiler hasn't been serviced for the last two years, sounds obvious that that could be the problem! I'll get it sorted then post again if I'm still having problems. Thanks, John

Hi, I have a Procombi 85 HE that has been installed for around 4 years. I'm having a problem where the solid red light fault indicator is showing and the boiler is shutting down. This happens when water and heating is selected, usually after around 30mins. It also happens occasionally...