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  1. K

    Vaillant Combi WCW T3W, pressure leak!

    Hi there, I had to change the pump because it would run for couple of hours and then stop. Sometimes it worked by thumping on the side or if its left to cool down then it would come on after 20-30minutes. I had someone round to get it working, but for leak he said HE needs to be taken off...
  2. K

    Vaillant Combi WCW T3W, pressure leak!

    Hi there, Few days ago I replaced the pump. Because the old pump was original, I had to undo the tank which sits above the burner. When I put every thing back and pressurized the system, found that tank's pipe opposite to the pump side has a leak in it. Now when boiler stops due to the loss...
  3. K

    Vaillant, Pump opened and refitted, now nothing works

    :) Thank you for your help. I had someone in earlier to look at it, he checked the voltage with multimeter. Inside the switch box behind the Red (for switching pilot light off)and green buttons there is switch, which had stopped pump from working due to getting too hot. It suppose to cut...
  4. K

    Vaillant, Pump opened and refitted, now nothing works

    Hi, Sorry could not reply earlier because I have just come on line after spending whole day trying to fix it. Yes after pressurizing the system I loosen the valve on tank (which sits on the top of the burner) pipes and also air vent attached to the pump. I also tried turning pump with the...
  5. K

    Vaillant, Pump opened and refitted, now nothing works

    boiler would stop for 15-20 minutes after couple of hours and would start again. Decided to open the pump up from four screws at the front and now nothing works i.e. no central heating or hot water. Drained the system in the process and took the air out from couple of places but no luck...
  6. K

    Vaillant VCW-Sine....T3W. Boiler stops & starts

    Mr Oilman :) Enjoyed reading your reply, thanks for that! :) Your are right pump is rotary and when I turned it clockwise/anti clockwise, it did not start. Body of the pump gets very hot, is it due to hot water flowing through or something else? If its left alone, its come on after a...
  7. K

    Vaillant VCW-Sine....T3W. Boiler stops & starts

    :? :? When it works, all functions i.e. Central Heating and Hot Water with/without instant water switch works for anything between 10 minutes to 2-3 hours. When it suddenly stops, nothing works. :( :( Had someone to fix it he fixed the pressure by removing overflow valve and cleaning it...
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