badlywornroy
I am not macho
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My CHB (using for hot water only at this time) is shutting down after 1 - 2 mins. Overheat protection it seems.
Boiler is under a Viessmann warranty. Viessmann engineer says boiler OK, suggests the pump is the problem. He cannot do more, just responsible for the boiler.
I was ready to believe the pump was the problem, it is old. New Grundfoss pump. installed, Eeek ! Boiler still shuts down.
3 way motorised valve seems fine, selector moving between heating / hot water / and central for both.
Where do I go from here ? sludged up system ? it was chemically cleaned 4 years ago. In line Magna Clense filter inspected and certainly not blocked.
Any suggestion ? and any experience of Power flushing on a (horrible) microbore system ?
Cheers
Boiler is under a Viessmann warranty. Viessmann engineer says boiler OK, suggests the pump is the problem. He cannot do more, just responsible for the boiler.
I was ready to believe the pump was the problem, it is old. New Grundfoss pump. installed, Eeek ! Boiler still shuts down.
3 way motorised valve seems fine, selector moving between heating / hot water / and central for both.
Where do I go from here ? sludged up system ? it was chemically cleaned 4 years ago. In line Magna Clense filter inspected and certainly not blocked.
Any suggestion ? and any experience of Power flushing on a (horrible) microbore system ?
Cheers