Honeywell ST9400c Programmer issues - help please

KksD · 21 Oct 2017

It seems when the timer was re-fitted something has gone wrong. The symptoms are:

Heating only – works OK

Water only – works OK

However, when you want water and heating together.........the timer seems to go mad. Switching on/off multiple times.....clicking noises etc.

Can anyone advise what the problem might be?

Echo the husky · 21 Oct 2017

The unit is likely faulty and will need to be repaired/replaced, see here: https://www.diynot.com/diy/threads/need-to-replace-faulty-honeywell-st9400c.372984/

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Honeywell ST9400c Programmer issues - help please

KksD

Echo the husky

DIYnot Local

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