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Honeywell st699 programmer. Has stopped working...the lights on the control were working, but when I changed the controls to continuous, everything went dead. Any ideas as to how to repair this?

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  • phoenixsvcs May 11, 2010

    It could be that something further down the control chain is at fault - hence producing this effect.

    Control chain is 1. Control clock 2. thermostat (room/water) 3. valve. Need to id which/where fault lies.

    Try repeating your action on the c/h only but with the room stat at min setting. Do you get the problem..?? If no then suspect room stat or valve. If yes then suspect control clk - replace.

    Suggest getting heating eng to resolve.

    Mike 07748 947 928


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SOURCE: keston c40 honeywel 9400c programmer

do a s plan plus and buy a poly plumb roomstat combined programer with built in relays as you require the relays to stop back feed! simple!

Posted on Jul 23, 2008

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SOURCE: Where can I get a

here you go. its under a different name but its the same Honeywell model.

Posted on Mar 06, 2011

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