loss of hot water in en suite from combi boiler

[italiancat]

All of my hot water taps work except the one in my ensuite, which will only put cold water to both the hot water tap and the shower. It is all on the same system without any extra valves etc isolating the en suite and there seems to be problem with pressure. Hot water comes perfectly from all the other taps and the bath. It is a baxi boiler with preheat function - when preheat is on I only get hot water for 2 secs then it goes back to cold, The whole system is only 18months old. Can anyone help me please!!!!!! winter is coming!

[pilotlight]

italiancat, You say there is a problem with the pressure to the hot draw-off points in the en suite. This would indicate a partial blockage to these draw-offs, as your other hot outlets have no pressure problem, and are providing you with hot water.
The burner on a combi boiler will only " fire " if there is sufficient water pressure to the appliance and at the draw-off point.
Hope this helps.

[italiancat]

sorry, made a typing error, should have read there is no pressure problem, just in getting hot water through. 2 pipes going up to sink ie hot and cold, isolated cold , still plenty of pressure from hot tap but no hot water.

[gasman]

Is this a new ensuite ??? Could both taps have been accidently coupled up to the cold feed.. Or did they work fine up untill recentley ???

[italiancat]

they worked fine for 18 months until 2 weeks ago. The only way I can get hot water to tap and shower is to turn both on and this will cause boiler to fire then i get hot water. pressure from hot water tap is equal to any other in the house

[pilotlight]

italiancat,
Two things to check now.
1. There may be a filter in the cold inlet valve to the combi, check this for being partially blocked. ( especially if road works on the water mains have recently been carried out ).
2. Check your own consumer stoptap ( that it is fully open ).
Hope this helps.

[italiancat]

if it was a cold water supply problem would I not get no hot water from any point in the house?, just a thought.!??
There is the same pressure from all the cold taps and the same pressure from all the hot taps, both of which are good. I don't know if it makes any difference but the en suite is the furtherest away from boiler.

[pilotlight]

italiancat,
The draw-off / draw offs furthest away from the boiler will be the first ones to indicate any drop in water pressure, even though this may not be visible.
If my previous suggestions prove to be futile, a visit from a boiler engineer may be required ( he would check the water pressure and the operation of the diverter valve ).
Hope this helps.

[italiancat]

thanks for you help, I will try your suggestion and report back, thanks once again.

[italiancat]

hot water pressure same at any tap micro switch on diverter valve removed with finger held on plunger of valve and hot tap or shower swiched on no action on valve all other taps that work fine tested and dirter valve plunger shoots out