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Hi guys, I am coming across this same problem time and time again on combis old and not so old.
In hot water mode boiler runs full rate then anywhere from 5 to 30 seconds later the flame goes out, any temperature on display goes mega high pump runs untill temp drop then relights 5 sec later and so on.
Some of these boilers will work fine on central heating others will do the same thing on central heating.
The diagnosis will often be blocked heat exchanger, presumably a dirty system is likely to have both heat exchangers in bad shape. So what is the best cost effective solution if the customer is reluctant to get a new boiler? Flush, replace plate to plate or insist on a new boiler?
In hot water mode boiler runs full rate then anywhere from 5 to 30 seconds later the flame goes out, any temperature on display goes mega high pump runs untill temp drop then relights 5 sec later and so on.
Some of these boilers will work fine on central heating others will do the same thing on central heating.
The diagnosis will often be blocked heat exchanger, presumably a dirty system is likely to have both heat exchangers in bad shape. So what is the best cost effective solution if the customer is reluctant to get a new boiler? Flush, replace plate to plate or insist on a new boiler?