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Many thanks to you all who posted to help me,boiler must have been going off with temp after 30 secounds as there was no flow through system, at least the boiler has had a good going over I would be interested to know if anybody else has had problems with these valves Once again THANKS.

job done but can't believe how before i posted the problem i noticed the diverter pin was sticking a little so i turned off the water and the flow and return isolaters,removed pin and cleaned then refited then turned everything back on,still did not work hence the post, over the weekend...

Good advice will try these over the weekend let you all know how a got on. found the service information on the vokera website(http://www.vokera.co.uk/ )under literature then discontinued products,all the electrical diagrams and fault flow charts are there. Many thanks.

The fan seems to be the same for both. Is there two pressure switches in the pressure switch unit one for hw other for ch. if so could the ch one be faulty. If it works ok for the hot water does this not mean the fan is ok thanks.

no room state fitted (good try) all trv's the system worked last winter and worked a couple of weeks this winter but has now decided it just wants to do the hot water thanks anyway. Any more help would be much apricated

have stipped valve does not seem to be any problems with that. all pins are moving in and out also making the swiches. If there was a problem with the fan would the hot water not work aswell ? thanks

As there is water actually going into the flow pipe could it have any thing to with the thermister which is on the pipe coming from the exchanger does this thermister do the hot water as well as the heating. thanks

Hi can anybody help hot water working ok but when set to heating the boiler lights up for about 30 seconds then goes off (pilot stays on). can feel that some of the hot water has just started to go down the flow. Fan and pump seem to run ok. thanks