Vaillant Boiler Problem

[knsbuilder]

I have vaillant boiler and it hot water got problems, central heating is fine. How water comes and then boiler burner shut off, re-start again then it continue with shutting on and off. Hot water have reduced in degree so just warm water comes. It is not the plate heat exchanger or the diverter valve. Any help please

Thanks

 

[Billy Bob Bob]

could be many things plate heat included call a gas safe registered engineer

 

[kennedy1978mark]

possible thermister ... does it keep firing up the boiler and trying to heat or does it lock out??
i know it sounds daft but is the hot water heat stat turned up/down..

 

[kennedy1978mark]

like the gas man says could be one of many things.mate

 

[knsbuilder]

Thanks mate, First i did call Gas safe engineer and he replaced pump then the diverter valce twice so it worked ok for few days and now the engineer have no time he saying it could be else so i already have paid £450 labour and parts so it is hurting and not knowing what next?

 

[knsbuilder]

Thanks mate

The Gas Safe Engineer have changed pump and diverter valve twice so it worked few days and again it is hot water just warm water so if it is plate heat exchanger then again i have to pay around £200 to 250 and i already have paid £450 for pump and twice diverter valve so if it is plate heat exchager then i have to pay but my worry is if it something else next then the cost i just cannot afford.

 

[Billy Bob Bob]

some one on here may be able to help,put a pro plumber wanted ad up

 

[knsbuilder]

Thanks mate