Hi, I've looked through the forum and I'm sure that this question must have been answered somewhere, the problem is with about 100,000 posts its a bit of a challenge finding the right one so sorry in advance.
I have a 3½ year old Worcester Danesmoor oil fired boiler and a megaflow tank. A few months ago (maybe as much as a year) we started to notice problems with the DHW getting very hot and the CH running when the programmer for CH was off. The plumber/engineer who installed the system (who is much too busy to look at a little job like this) said that it was the danfoss HPA2 motorized valve sticking and I should replace it! (I'm not a plumber!!)
Things seemed to settle down a bit without doing anything at all until recently. Now the CH refuses to kick in unless the DHW is running and often the radiators do not get hot even with the DHW and CH "on" on the programmer. The boiler fires up to heat the DHW but will not fire up on CH alone.
Is it likely the danfoss two way valve? Looked at closely the top of the plastic housing is a little discoloured (slightly brown probably due to some component overheating / burning out).
Is there another obvious cause that I'm missing?
I have a 3½ year old Worcester Danesmoor oil fired boiler and a megaflow tank. A few months ago (maybe as much as a year) we started to notice problems with the DHW getting very hot and the CH running when the programmer for CH was off. The plumber/engineer who installed the system (who is much too busy to look at a little job like this) said that it was the danfoss HPA2 motorized valve sticking and I should replace it! (I'm not a plumber!!)
Things seemed to settle down a bit without doing anything at all until recently. Now the CH refuses to kick in unless the DHW is running and often the radiators do not get hot even with the DHW and CH "on" on the programmer. The boiler fires up to heat the DHW but will not fire up on CH alone.
Is it likely the danfoss two way valve? Looked at closely the top of the plastic housing is a little discoloured (slightly brown probably due to some component overheating / burning out).
Is there another obvious cause that I'm missing?