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My honeywell st7100 CH &

My honeywell st7100 CH & HW controller has suddenly stopped working and fails to respond when i try to swith on either the CH or HW via the 'manual switch-on' or 'extra hour' options by pressing the buttons. The unit is approx 18 years old. Does anyone have any ideas what may be causing the problem ??

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  • 3 more comments 
  • Anonymous Jul 22, 2008

    Have changed batteries. Unit still fails to work.

  • mkmkmkmk Sep 13, 2008

    in set mode buttons work and screen lite once i press run it goes off any ideas on how to fix this fault

  • not a spark Nov 06, 2008

    All the readings had gone off, I changed the batteries reset the times, pressed run and the readings have dissapeared again. can anyone help or is this unit beyond repair. Its very cold and I would like to fix this unit this evening?

  • ppnpnp Nov 15, 2008

    Exactly the same problem as 'not a spark'. Help.

  • Anonymous Nov 19, 2008

    I have the same problem!!!!!!!!!!!!!!!!!!!!!!!!!

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1 Suggested Answer

co7196
  • 3433 Answers

SOURCE: how to change battery on honeywell st7100 and what

Pull the unit straight out and away from the wall. It is plugged into the baseplate. The batteries are behind or among the 30 pieces in your hand and on the floor,,,, AH! Just kiddng, you wil see the batteries on the backside.
When pulling off use gentle rocking as you pull. You will see why when it is off. To reinstall, just line up the oinds and press in place.

Posted on Oct 27, 2009

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