Question about Honeywell Programmable Thermostat Heater

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Honeywell STC 6400C problem

I have a honeywell ST 6400C system(we've just moved in). I set a programm for the hotwater to come on with no heating and the heating comes on as well. any ideas?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Buffalo12980
  • 625 Answers

SOURCE: installing a honeywell CM900 wireless programmable thermostat

the analog unit uses just two wires for heat. red - white. there is a heat anticipator setting that must match the burner current. check your programmable specs and follow instructions.

Posted on Dec 07, 2007

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  • 1 Answer

SOURCE: honeywell deluxe programmable thermostat 69-1402m

Solution #2 as above worked (thank you very much!) to get to the programming mode, but on mine keeping Function #13 on the default setting of "0" maintained the AIR.  Toggling the Temp button to "1" changed the system to conventional on/off at the programmed times.

Posted on Feb 07, 2008

hotuna
  • 288 Answers

SOURCE: honeywell st7000

what type of system do you have? cool/gas heat, heat pump, electric cool & heat. split system or package unit?

Posted on Mar 14, 2008

  • 68 Answers

SOURCE: replacement of heating programmer

yea you should be able to just when you remove the old one mark witch wire went to witch connection by marking it some how i personaly take one wire at a time wrap it with a small piece of white tape and write the letters on the piece of tape then when i replace with the new one i cant mess it up also look for any of the wire connections to see if any have to be or have been jumped out

Posted on Dec 14, 2008

Therinnaiguy
  • 1420 Answers

SOURCE: installed my thermostat and the heat keeps

Make sure red wire is on R terminal, white wire is on W terminal. Also look for a short in the thermostat wire.

Posted on Oct 17, 2009

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