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Hi Hopefully title says it all. Has anyone had issues with condensation in a dormer window and found a good cure for it. Cheers

Hi Terry were there supposed to be attachments with this message? (These graphs are in the instructions for your boiler and pump) thanks

Hi I've found some info on the boiler and manual says min flow to be maintained is maintain a minimum flow through the boiler of 4.5 litres/mm (1 gal/mm) Is this correct? i thought it would be expressed as litres/minute

Thanks for that info. There 2 other settings I think CP1 CP2 ? Would these be more suitable as the pressure is supposed to be more constant even if load changes? If not, I could use III. The original Grundfos 15-60 was set to this Cheers

Thanks terry I’ll start having a read and findinding boiler flow etc Cheers Hello Chris Thanks for info Cheers

Thanks for Rob Pond info. That explains why they weren’t very helpful with any pointers re setup. Pump is currently set to PP2 which is factory set , and recommended for 2 pipe heating system

Rob Pond Heating Solutions Is name on valve paperwork

Hi 2 Honeywell zone valves are installed I fitted a valve from Screwfix Not sure of make. I’ll find out

Thanks for detail I understand the theory etc How do I find “flow rate” and “required head” I’m sure at present it’s set too low, but I don’t want to screw it in too high. Or is it trial and error? Cheers

Hello terry. ( first response) I have checked with a magnet where described. No evidence of a blockage using this method Pump is Grundfos alpha 2L Set on highest of constant settings at present Could you explain more about second response? “Nope” doesn’t tell me a lot Thanks Hello...

Hello I’ve replced bypass valve with a new ABV. Set at default 0.2 bar Vastly improved the circulation problem. However I’m not sure how to calculate the best setting for the valve to assist the system. Can anyone help with this please? Thanks

Good Morning Update to those who have been interested and to anyone who can help further. On Wednesday I drained system after cleaner had been in for 9 days, fluid still quite clear. Then removed the original bypass gate valve. It was found to be seized at more than 1/2 open. Fitted an Auto...

Hi Hugh No evidence of any damage to pipes anywhere Hello hossacd I have been thinking on similar lines, that flow is getting back to easily Going back to St Albans (sons house) on Sunday for Xmas I intend to fit an auto bypass valve on Wednesday Regards

Ok I have had the pump off the system and it is all clear Very little evidence of black crap etc I am fairly sure all pipes are clear Some rads get warm when I shut some down. When I shut the warms one down and open the cold ones I do get heat but not enough When all are open upstairs they seem...

Hi Terry By open vented do you mean header tank in attic with cold water feed to system, and and a 22mm pipe I refer to as an expansion pipe over the top of the tank , then yes it is. Haven’t tried a magnet anywhere, what would I be checking for? Thanks

Hello Terry Not sure about pipe sizes under floors To and from boiler 22mm Flow and return to rads 22mm into upstairs floor space 22mm to and from ground floor then they disappear into floor and all rads on 15mm rising tails I’m pretty sure that the 22mm should have been extended further. But...

Thanks again I’ll fit one anyway for piece of mind. Would you know if they are same length as a 22mm gate valve? If so it’s a straightforward swap out Cheers

Thanks Stem Appreciate you detailed explanation. I’m getting poor circulation to the extremes of the house. I’ve tried cleaning , balancing etc with little improvement I haven’t touched the bypass yet. What issue would I see if Valve is fully open? Valve is shut or blocked? Cheers

hi I’ve been battling a problem with my sons system. See earlier post re circulation System has a Potterton Profile boiler with a header tank 2 zone valves and Grundfos pump. Total of 11 rads with TRVs 1 rad with lockshields in hall where room stat is located. Plus 1 towel rail in bathroom...

Hugh All 3 removed are at the end of system. I have left wide open and closed a few close to boiler. This does allow the 3 rads to obtain some heat but not enough. Checked operation of TRV all ok Cheers