Honeywell ST699B programmer

Quagga2006 · 17 Oct 2006

Hello everyone, hope someone can help.

My Honeywell ST699B seems to have failed - the display is blank and, even though teh boiler is working fine, the heating won't come on. Do I need a new unit? (By the way, I think it's an older version as it doesn't have a reset button).

If I replace it, do I need an electrician to do this? Do I have to replace with the same model? Or could I upgrade to the 7-day version - is there a lot more work involved doing that?

THanks for any advice.

ChrisR · 17 Oct 2006

The 7 day 799 just clicks onto the same backplate - eezy peezy.
You poke a wee screwdiver into the 3mm slots to release it.

geoff@cetltd · 17 Oct 2006

replace the 3.6 volt NiMH battery

should be available from Maplin or similar outlet

ollski · 18 Oct 2006

thought the battery was purely a settings back up?, pretty sure youd struggle to replace the original batteries on these...those big barrell shaped ones.

geoff@cetltd · 19 Oct 2006

wrong and wrong

ChrisR · 19 Oct 2006

wrong and wrong

Do elaborate.
The battery died on mine about 17 years ago and it still works.
Obviously it wasn't a NiMH battery.
Perhaps something changed with the B version? Can't swear to which exact model mine is.

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Honeywell ST699B programmer

Quagga2006

ChrisR

geoff@cetltd

ollski

geoff@cetltd

ChrisR

DIYnot Local

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