Question about Honeywell 2-way Oscillating Ceramic Heater

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Honeywell programmer gone dead

My honeywell programmer went bonkers yesterday - the time on the clock and the settings were completely wrong. Then this morning it is totally blank.
There is a sign on the junction  box above about batteries.  Does the programmer contain a battery and could it need replacing? If so, how do I get the programmer apart to do this?
Or is it some other problem?
thanks for your help Elisabeth

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  • Honeywell Master
  • 12,104 Answers

Lift the face plate off and change the batteries

Posted on Jul 07, 2017

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Honeywell RTH230B

This my situation exactly.  Changing from a 6 wire manual round Honeywell thermostat to a 5 wire Honeywell programable.  Is there a way to maintain all functions?

Posted on Nov 25, 2008

  • 1 Answer

SOURCE: rewire an old 2 wire thermostat to a honeywell 5-1-1 programmable

I connected the blue wire to the R and the white wire to the W on the old thermostat and shoved the new Honeywell 5-1-1 Day programmable thermostat up the first guys *** that i ran into at Canadian Tire

Thanks for your help

Posted on Dec 29, 2008

co7196
  • 3433 Answers

SOURCE: unlock Honeywell TB7220U1004 Ultrastat Commercial

Pull off face and remove batteries and reinsert.

Posted on Jun 01, 2009

  • 1 Answer

SOURCE: how do i remove my st699 honeywell programmer from

Because there are no apparent screws to remove the front of this unit it can be very confusing if you have not done it before. Underneath and to the right hand side you will find a small notch in the plastic, it can be difficult to see when the unit is on the wall, using a small terminal screwdriver push upwards on the plastic tab which locks the front in place and with a slightly larger flat bladed screwdriver prise the front off bottom first then the two locking tabs at the top.
You will probably find that the back case is fastened to the wall with two screws.
Replacement is simply a matter of snapping the front back into the case.

Posted on Sep 22, 2009

  • 1 Answer

SOURCE: Even after replacing the battery, the programmable

Turn control to off. Remove the batteries for at least one hour. If the display message still reads "bat lo", leave control off, batteries out, and disconnect the red wire on back and wait another hour. Reconnect red wire, put new batteries in and turn system on. It's like a reboot.

Posted on Apr 13, 2010

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