Honeywell ST9400C

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2 Jan 2009
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Somerset
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United Kingdom
Hi can anyone advise if the new Honeywell ST9400C programmer will directly replace an old ST699B controller which I want to replce :?:
 
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if its the same shape probably yes. If its the square one good luck getting the front off :LOL:
 
From a functionality perspective the ST9400C will replace an earlier ST.

However the backplate and size of the new unit is slightly different.
 

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