Recent content by MGAX

Hi wannocks, I hadn't realised flow temp is s/w controlled in DHW mode. It's odd that when CH is operating and flow=75C, it can drop to the low 50s when there's DHW demand. But when there's no CH and the system is cool, DHW demand results in flow=75C. So there's something funny about flow temp...

Hi wannnocks and rbranco, Thanks guys. Your quick responses much appreciated. That you both came up with the same possible cause must say something! I haven't finished investigating that yet but have put initial comments below. But first:- I discovered something new. System had switched off...

Controls are Danfoss TP5000 RF. Set to 25C all day at the moment (usual winter setup). Effectively I'm using the thermostat as an on/off time switch and the standalone TRVs on the rads regulate the temp in the rooms. Underfloor heating has its own Danfoss and I'm using that as a thermostat, but...

Several times in a week, system flow water temp settles at mid 50s (return: high 40s) when the set flow temp is 75. Room stats calling for heat, burner on, pump on, pressure OK, no new codes. Just doesn't rise to the set flow temp. This continues until boiler is switched off, cools down (to mid...