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Put a new Grundfos UPS3 pump in at weekend and put on 3rd setting. No change at all on first day but then on Sunday suddenly the rads were hot in 20 mins and been fine since. I think some sort of partial blockage on return flow that new pump has cleared. Fingers crossed stays so. Many Thanks to...

Hi All Had time today to get back to you all. D0 is set at 12 now. D2 initially on default at 20. Last night and with room stat up and CH only, boiler fires with S2, then S3,then S4. full burn for approx 40 sec to one min upto 70 then S53 and hour glass on display. D40 and D41 were 41 and 23...

Thanks Jackthorn, My error on D.0 its set at 14 e.g 14Kw. Have tried upto 16 but made no noticiable difference. The temp on front panel is set at 70. I appreciate that they run lower initially but this appears too long. When it does fire on full its a very short period (seconds) till it gets...

Hi I have a 418 heat only boiler, external 3 way valve and running Y plan. No air in system and running Fernox F1 since new. Also magnetron on return next to boiler, hardly any deposit when checked every 6 mths.No ambiant temperature controls fitted. All Y plan valve working correctly and pump...