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We have a honewell ST6400S central heating programmer and it has gone into service reminder mode, we have had our boiler serviced and the service engineer is unable to reset the system. There is apparently a key sequence using buttons and sliders that should be used to access an installer mode which then enables the system to be reset. The documents refer to a leaflet reference EN0R8542 describing this key sequence that Honeywell seem to not include with their products. Does any body know about this leaflet and this key sequence, otherwise i will need to pay to have the programmer replaced with a different manufacturers. (bit of con if you ask me honeywell !!! a programmer that last 12 months and then dies!!!) Please help

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SOURCE: Hi. I have a ST6400S

The only way to get the key sequence is to contact honeywell tech support, they will give you the sequence over the phone as long as you are a contractor (or pretend to be one), but they will not send out any literature on it. If you live in an owner occupier dwelling then it has been fitted by mistake, and the best thing is to replace it.

Posted on Sep 10, 2008

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