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Hi dboiler Did your boiler settle down eventually? How was it solved? I keep having similar problem - F23 fault code system shut down

Vaillant Ecotec plus 418 - why constant F23 fault? I had this boiler installed two and a half years ago. It was working fine until last Sunday when it all shut down, no HW or CH and displayed the F23 “System shut down Temperature spread too large” fault. Plumber came and replaced the pump. All...

Sounds like a fault as boiler in always on within a 24 hour period so anti-seize isn't needed. Also explains why my plumber had never come across the problem before. Am concerned that the the technical helpline says this is normal and can't be changed! Will wait for Chief Exec's reply..

I'm having the same problem with my Vaillant eco TEC plus 418 fitted last month. It comes on briefly for about 10 seconds outside the timed periods and then switches off. This happens every 23 hours. This doesn't matter during the day but is a nuisance at night as it is waking me up so this week...

The plumber arrived today and rang Vaillant's technical helpline. It is the pump's anti-seize mechanism which is making it come on briefly every 23 hours, including outside timed hours - cheers, picasso! I'm gobsmacked that Vaillant has deliberately installed a feature which will wake people up...

I’m now wondering if there is an additional problem with the wiring for this boiler, besides the 24v link. The boiler is timed to come on for an hour in the morning and at 6.30pm in the evening, going off at 9pm. The boiler is active until about 7.45pm i.e. displays the radiator symbol...

Thank you very much. Yes, my controller/ timer is a Drayton Lifestyle so hopefully your solution will work. Plumber returns on Monday so fingers crossed!

Hi I had a Vaillant eco TEC plus 418 boiler installed last month. It seems to be working fine except that every day/ night it comes on once briefly for about 10-15 seconds outside the timed periods and then switches off e.g. 3.10pm on Wednesday, 2.10pm on Thursday etc. This doesn't matter...