ST9420c Problem - DHW light stays on regardless

Joined
4 Oct 2014
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Location
Lincolnshire
Country
United Kingdom
I wondered if anyone else has had this problem? I don't use the DHW timer that much on my system as I have an immersion which heats more quickly for my needs. Sometimes, if I have the heating on anyway, I use the Hot Water channel on +1 or +2 and get hot water that way. Today I did that, and the tap icon on the controller went off as expected but the green LED stays on and the DHW zone valve stays open, also regardless of the heating, also the flame symbol stays on the timer display.

A reset did not solve this, but I removed the battery from inside the programmer and this seems to have done the trick, at least for now. If anyone esle had this problem, I'd be gratefull to know if the battery remove/replace worked long term?

Thanks.
 
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