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Hi Okay I turned on HW only this morning and the bathroom rad gets hot first so it looks like that 15mm goes there. Then it seems the downstairs rads start to slowly warm up. When HW is off and CH on the first rad to got hot is in the 1st floor bedroom directly above the boiler on the ground...

I haven't managed to turn the heating off and do the tests yet. What I did do was make sure HW was off. Empty the HW cylinder until it runs cold then wait with only CH on. After 60 mins the HW tap was warm. I knew something was up before because I never had a cyclinder stat until one was fitted...

The flow came out of the original boiler then split, with one 22mm going to the cyclinder and the other to the 2 port valve which went on to the CH circuit. Everything heats up when HW only is on even the the CH valve is definitely close. Although some rads don't get very hot. I'll do the...

Hi I've got a vented system. It's a very only setup and up until 2 weeks ago i only had one two port valve. Because the rads were heating up when only HW on the timer was on I assumed the valve had gone. Rather than replace the valve I went for a 2 x 2 port salus valve kit and paid for it to...

The more I think about it the more I think my old Potterton might be fine. I may wrongly have assumed that a combi was the energy saving way forward? It's a 3 bed house and if I spend 2K and end messing with her shower my life will be over. Put it this way. I don't need the space that the...

Hi Currently got a vented system with a Potterton RS80 from way back. The setup is dated and the controls I have are limited so I've finally decided to upgrade and will probably go for an Ultracom 35CXI Combi. Currently I have a Salamander CT75 shower pump feeding the shower only. No...

Hi About 3 weeks ago a burning smell came from the dishwasher then it started tripping the fuse a few days later. The source of the burning was the flow through heating element. The plastic terminal connector was scorched and metled. Does this indicate that the actual heating element is...

Thanks for the discussion guys. I've let it run for a while with the CH off and the valve in the closed position and it seems that all the rads are getting hot, not as hot as when CH is on but hot still. If I set CH to on they then get hotter i.e normal for on. In my mind from what I can see...

Been in the house for 2 years and I've only just decided to find out why HW ON means CH kind of ON. Previsouly in the summer when I didn't want CH on I would just turn off all the rads. So no it's not a recent problem it could have been like this for years!

TWGAS When the system is cold and I turn HW on only the valve stays closed but the pipe to the rads gets warm/hot and the first couple of rads get warm/hot. If I then hold the pipe and manually open the valve with the other hand it definitly fully opens as it then becomes too hot to touch...

Thanks. Its a potterton RS80. There doesn't seem to be any other valves. When I chatted with the last CH guy that came round he metioned having to add a second valve for isolated CH and HW control. There is one other manual valve near the cyclinder with a circular handle which I've been...

Hi I have a single 2 port valve above my Potterton boiler which from what I've read controls the flow of water to the rads. The valve seems to open and close correctly when CH is selected on the programmer BUT when CH is OFF and the valve is closed the outlet pipe to the rads is still hot and...

It's all working! Was definitely the pump but the thermo just made things even more confusing. Anway if I turn the stat down the pump cuts out and up again turns it on so all seems well (I think). Thanks, you guys!!

no shocks yet! Voltmeter says 240 so I guess that would be mains voltage then! My problem is that the boiler keeps cutting out. I thought it was the pump so I changed that this morning. The new one is whirring away now, all the pipes around it are very hot but the rads are still cold which is as...

I'll do that this morning. What I do know is that when you join the black and red they spark a little but if you turn the boiler to the OFF position it doesn't. That must sound so bad but I just happened to find that out.

Okay thanks The wires at the room stat end are earth, black and red. There is a white junction box by the tank so I'll take a look at that. The old stat was very old looking. As far as I can remember it was similar in size to the simple newer ones but beige with a circular dial and what from...

The system is an open vented gravity system with a very old Concord WRS boiler. The old thermostat is long gone now and I took the new one back to the shop yesterday so still to buy one. I wish I kept a record of the wiring on the old one now! I may have done a stupid thing but I connected the...

Hi I removed a very old room thermostat and puchased a new one. Can someone please tell me how it should be wired as the instrucitons don't seem to make sense, maybe the wiring is old or something. Coming out of the hole in the wall is 3 core cable with an earth, a black and a red wire...

Thanks I'll give it a go. It has been making one hell of a rattle for the last couple of years! Does the fact that the pipes above and below the pump are piping hot not mean its working?