graham1 Posted July 9 Share Posted July 9 Just had my ASHP system power flushed. The radiators on the system were all new when ASHP was installed 2 years ago but most of the copper piping is about 20 years old being used for oil fired central heating Today (1 daY AFTER FLUSH)with heating turned off as it has been since about May) several radiators (4) are heating up to +- 30. Any ideas - installer at a loss Thanks Graham Link to comment Share on other sites More sharing options...
JohnMo Posted July 9 Share Posted July 9 You will either have a single 3 port diverter or 2x 2 port valves. Were any of these put in to a manual position and not reset? Link to comment Share on other sites More sharing options...
Beelbeebub Posted July 9 Share Posted July 9 Or the power flush has damaged the little ball in the valve (if you have that system) and it's letting a bit by. But the culprit is likely in the valve(s) as JohnMo says Link to comment Share on other sites More sharing options...
graham1 Posted July 10 Author Share Posted July 10 If it is a problem with 3 way valve would not all the radiators heat up not just 4 or 5 Link to comment Share on other sites More sharing options...
dpmiller Posted July 10 Share Posted July 10 nope, a tiny bit of flow can move heat to odd places... Link to comment Share on other sites More sharing options...
Beelbeebub Posted July 10 Share Posted July 10 5 hours ago, graham1 said: If it is a problem with 3 way valve would not all the radiators heat up not just 4 or 5 Need more facts, but if the valve, either diverter or 2 port, is letting by just a tiny bit, then the first few rads in the loop would get a bit warm. The OP states they are getting to maybe 30C during DHW cycle, but the flow temp would typically be higher, which points to a little flow sleeping past. Possibly because the valve is damaged of maybe a little bit of crud from the power flush is stuck on the seat. Link to comment Share on other sites More sharing options...
sharpener Posted July 10 Share Posted July 10 Honeywell diverters in particular have had all sorts of QA problems in recent years. Installers seem to recommend ESBE valves for anything over about 5 kW. Link to comment Share on other sites More sharing options...
JohnMo Posted July 11 Share Posted July 11 8 hours ago, sharpener said: Installers seem to recommend ESBE valves for anything over about 5 kW. That could be more to do with pressure drop than anything else. Normal diverter valves have quite large pressure drops, so when you start pumping more than about 1.5m3/h the drop is quite big, even with 28mm valves. Link to comment Share on other sites More sharing options...
sharpener Posted July 11 Share Posted July 11 (edited) No, reliability. This is just one of several recent posts on the Arotherm Plus forum about duff Honeywell valves falling apart https://www.facebook.com/share/p/nqxrMWsS4CE7Uio4/. Edited July 11 by sharpener Link to comment Share on other sites More sharing options...
graham1 Posted July 11 Author Share Posted July 11 On 09/07/2024 at 17:09, graham1 said: Just had my ASHP system power flushed. The radiators on the system were all new when ASHP was installed 2 years ago but most of the copper piping is about 20 years old being used for oil fired central heating Today (1 daY AFTER FLUSH)with heating turned off as it has been since about May) several radiators (4) are heating up to +- 30. Any ideas - installer at a loss Thanks Graham On 10/07/2024 at 02:50, graham1 said: If it is a problem with 3 way valve would not all the radiators heat up not just 4 or 5 Not sure how to respond to answers The valve was in the manual position. Waiting to see result as set now Link to comment Share on other sites More sharing options...
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