Problem with Honeywell ST6400

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1 Mar 2007
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Hi All,

I have a Honeywell st6400c controller running into an Amptec Electric boiler. Nothing overly complicated - standard Y Plan heating and hot water (via a thermal store). However - since changing the hotwater/heating programmes since the clocks changed - it now no longer 'calls' the boiler. It will only work when set to 'constant'. I have triple checked the timings/programme (the HW 'on' light on the ST6400 does come on - but no call light on the boiler).

Can anyone please shed some light on why this maybe occurring?

Cheers in advance.
 
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Have you got an off before the on.

Is it set for 24 hr or 12hr.

Check the programs for AM and PM, quite a common problem.
 
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Hi doitall - thanks for the reply. The prog settings are (all 7 days) - pretty sure it's 24hr setup:

on: 05.30
off: 07:00

on: 13:00
off: 14:30

on: 22:00
off: 23:30

I'm away for a few days and will fiddle around when i get back.

Cheers.
 

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