Unvented Cylinder No Hot Water

[Yogiblair]

Hi,

I have a Tribune Range HE, direct unvented cylinder with a gas boiler. Recently I had a very small leak (more of a weap) from the two port valve on the CH. I isolated the water supply, electricity and closed off the valves I could see directly effecting this circuit. I removed the actuator assembly cleaned up the two port valve, re-seated everything and all appeared ok. The leak has been fixed.

The next day after showers I ran out of hot water. One thing to note that I have been running this as an indirect system for over a year (immersion heater switched off) and always had sufficient levels of hot water.

The CH works fine. In investigating I noticed that i had zero pressure at the expansion tank. (when removing the two port valve there was a very small release of pressure) I opened the fill loop and now have 1.3bar at the expansion tank.

I can get hot water by turning on the immersion heater, however I have tried several tests now with the immersion heater off and after using the contents of the tank I get cold running through.

I have read that my problem may be with the motorized valve on the primary flow line. I have tried running this in manual but still get no hot water unless the immersion heater is on.

Any help greatly appreciated.

 

[Howsie]

And with that, I'm out.

 

[Gray0689]

And with that, I'm out.

And me too

 

[Rob Sale]

Remove the valve head, see it you can turn the valve with your fingers if it's stiff then the valve is gubbed, as they say in Scotland.

 

[Yogiblair]

Remove the valve head, see it you can turn the valve with your fingers if it's stiff then the valve is gubbed, as they say in Scotland.

Rob,

Thanks for the advice. Valve turns no problem. Must be faulty actuator, will replace this. Not as cut and dried as some of the "experts" above have proclaimed as this is a separate fault to my original problem of leaking CH two port valve.

 

[rob2048]

Did you close the gate valve on the return out of the cylinder and not open it simple but possible if its that it wants to be half open I will say you don't really want to be messing with unvented if it goes wrong they can be the most dangerous thing in your house I'm not trying to scare you it is

 

[Howsie]

I've give up if I were you Rob. He IS working on an Unvented system but choses to ignore the fact. Ignored the post which actually gave him the answer, post 3.



Or not as the case may be...

 

[on31ll]

Unvented Hot Water (G3) Cylinders

their you go thats the qualification the engineer will need when your looking for one. you got more help here than most do ! do a search.. most of these threads have a straight answer of your not qualified get sombody in.