H/W Heat not working together

Joined
21 Nov 2006
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Location
London
Country
United Kingdom
Have a Combi Valliant boiler which currently doesnt want to operate both heating & hot water together. Both working fine when set to come on alone.
Our controls consist :
1....Overall on/off hot water and heating (seperate controls min to max),
2....Control for the heating to be either off or on constantly or per clock timer
3....Clock/timer for the heating itself

When we turned the heating for 1st time this yr the hot water didnt want to run hot when the heating was on..it as was running cold.
When the heatin was off and we ran the hot tap the radiators would come back on although not set to. The rads are heating when the overall heating control is on (control 1 as above) but the clock timer off and not on constant either? The light for hot water flashes for \\\"demand of hot water\\\" fine but just runs cold.
I have to turn all heating controls off completly and wait a while for heating to all turn off before the hot water runs from the rap.
Noticed the pressure drops right down when had hot water tap after heating been on, also i think water was exiting via the back external pipe to outside at this point.
When i turned the overall heating control off and hot water tap on the pressure went back up slowly.

We had a plumber out yesterday who checked out everything and couldnt find anything wrong with the system, unfortunatly he didnt stick around long enough to see the effects of the heating beenin on a while and then to see no hot water. Do u think its a programming prop, would we need a technician or electrician rather then a plumber?
 
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sounds like the diverter valve may have jammed in heating,common fault on vailants around 2/3 years old. if stuck b.gas advertise a repair with part for 156 in certain parts of the country good value as valve is around 100 to buy
 
Thanks for that... apparently plumber checked the valves yesterday, would it be clear if jamming? If jamming would the hot water be running when all heating controls off then?
 
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