vokera excell 96E no hot water?

i get no hot water or if i do get hot water it for a few seconds then goes freezing cold ,if the cold tap is put on hot goes cold straight away and that is if i have heating on or off ! we moved into the house oct and had two new parts added to it as wouldnt even come on ! it takes an hour to pour a bath i,m sick of it . the council think im lying and have now said if i phone once more im getting charged ! the council say that if i have the heating on i get no hot water and viceverca even when my washing machines on i get nothing please help as one of the boss's coming out thursday and i need ammo !

wendy rowbotham
February 2014

the volkera excell boiler has a lot of problem with this post above...i got...www.mkcityproperty.co.uk to do mine and now im warm and happy...there servise was outstanding...

linda
May 2007

This is a common problem, google 'Vokera diaphragm excel' etc to find postings.

The 96e manual can be downloaded as a pdf from the Vokera website (www.vokera.co.uk ,literature, discontinued products)

The boiler knows you need hot water when a fulcrum arm is moved when you turn on a hot tap, this operates a microswitch. The most likely cause of your problem is that the arm is not moving because the domestic hot water diaphragm has a hole in it.

You need the manual, look at page 33 for the exploded diagram of this bit of the boiler. Turn off the boiler and disconnect from the electricity, turn of the cold water going in. Remove the case. Remove the fulcrum arm by unscrewing the slot headed pivot screw. Remove the grille below the boiler to improve access (two cross headed screws right & left front) remove the five screws (posidrive/spanner) from the brass cover over the diaphragm. Remove the shot diaphragm and carefully clean off all traces of it left stuck on the plastic pusher plate and the brass insides; this is important, if you don't do this the replacement will not last long. Fit a new diaphragm and re-assemble. If you get drips from where the actuating pin passes through the brass cover you need a new 'o'ring holder guide thing. This is provided as part of service kit t0019, fitted in a standard Vokera service. If this does not fix the problem (it should) then it is possible that the microswitch is faulty, replacement is straightforward, cut the leads to the old and wire in the new with a chocolate block connector or use the crimp connectors supplied with the replacement.

In general you should be careful working on gas appliances, as mistakes could leave them in a dangerous state (though diaphragm replacement isn't too risky IMO)

Your boiler has presumably not been properly serviced for a couple of years, now might be a good time to get it done, it will prevent other common ailments such as hot/cold domestic hot water temperature cycling, wild fluctuations in pressure associated with using the central heating, and it also gives a general safety check. Phone Vokera for a local trained service man. Always use someone familiar with your specific boiler, generalists can be costly and slow as they learn the quirks of your boiler at your expense.

cd
April 2007

check your diverter valve to see if it is activating the micro switch when water on, pin in middle may of stuck

hi-spec plumbing
April 2007