Recent content by leesonr

The system is a pumped CH/HW system, with back boiler and the usual HW cylinder and header tank . When the controller is set at HW "on" and CH "off", the radiators heat up when the boiler comes on to heat the water. It would seem that the motorised valve is stuck in the open position. As...

I've found out where the 22mm vent comes out it feeds into the cold water tank. So the system is vented. Presumably overheating the boiler involves interfering wit the normal thermostatic turn off of the boiler.

There is a 22mm pipe going up into the loft area that is t'd off the 28mm flow into the HW cylinder, but because of the layout of the tank area, I can't see where it comes out. Surely there must be a vent on this sytem?

Thanks for that. I'm pretty sure the expansion tank has water in it. I checked it about 2 months ago. I wouldn't have thought a 28mm pipe would block and what could cause an airlock. The system has always been difficult to fill since I had a loft extension and they resited the expansion tank...

I have very simple 28mm gravity HW system to an indirect HW tank and a pumped 22mm CH system, with 15mm T offs to the radiators. The boiler is a balanced flue Potterton Kingfisher II approx. 10 years old. There is very little to go wrong with these boilers, though I recently replaced the...

I have a porch floor in which several of the quarry tiles have pitted and one has lost its surface completely and is worn to a depth of approx 8mm. I don't think it will be easy to find replacements of the same age or colour as the existing tiles and getting the damaged tiles out would be...