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Boiler is switching on pump and displaying "c" even though no heating or water being called for, this seems to be in addition to the "t" cycle.

I have a Baxi 105e which is 3 years old, it will not fire up when you call for CH or Hot Water. After a short time of trying to light the first LED flashes, I have checked condensation drain and that is clear. Called out an engineer and he checked out the boiler, said every think checked out...

I do have a frost stat and a pipe stat. When room stat is up to temperature and valve closed "C" is on display no blue light flashing, pump is running. If I run domestic hot water display changes to "t" and after a short time changes to "d" when water is turned off boiler continues to run for...

Sorry if it was not clear but "C" is showing in display. Could it be that there is a problem with the "t" function?

The PCB cover is Black.

Hi, I have an Ideal Isar HE24 Boiler. I had a problem with the Diverter Valve sticking a short time ago, sorted that by removing and using release oil to get it free. That now seems to be working alright. I have now got a problem with the Boiler running without the burner, C showing on...