Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Replacement for Honeywell ST100 heating & hw programmer.Thanks

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5 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: No hot water honeywell st6400c

HW valve was stuck in the open posiion and the micro-switch was not working so thats why boiler and pump were not starting. Bled system to below the level of the valve to be changed, and replaced valve with a drayton ( easy quick change of valve head if needed no screws )

Posted on Sep 17, 2008

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cactus bob
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SOURCE: Honeywell Programmable Thermostat Display issues

there are currently 60 honeywell thermostats made i have no idea witch one you have , but a lot of the new ones run on batterys you might be seeing a low battery signal . look for a door where batterys might be and replace them

Posted on Jan 15, 2009

t1m130
  • 86 Answers

SOURCE: Programmable T stat

your trane heat pump energizes the reversing valve with O - orange y - is to turn on the unit make sure you have your orange wire hooked up and the tstat programming set to heatpump otherwise your reversing valve might be bad

Posted on Jun 30, 2009

  • 2522 Answers

SOURCE: Honeywell junction Box and QE2 Programmer

Hi check the wiring to the cylinder stat is there power to it then is it going to the valve

Posted on Feb 18, 2010

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1 Answer

Hw and ch not coming on auto , will come on if reset but following day will not come on again until reset , there is no red light on , on the time guard does this have any thing to do with it?


Hw & ch in my vocabulary means Hot Water & Chiller. I have never seen this on a thermostat. I'm also assuming by time guard, your saying time delay. The time delay only goes into effect if there is a power interruption.

Dec 02, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

Heating and hot worker work separately but not together


If this a honeywell valve you may need to change the motor in side the valve , sounds like its lost some of it power to move the inside of the valve to y postion .

Nov 04, 2012 | Honeywell Programmable Thermostat Heater

1 Answer

Programmable Thermostat Heater: no power to honeywell central heating control...


Multiple possibilities:
Damage to cable (doing any DIY?)
Failure of thermo
Board gone in heat unit
Possibly simple as loose or disengaged connection, check at thermo & heat unit, if nothing obvious, call serviceperson.

May 18, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Cannot get central heating working,for honeywell ST6400 programme


with y plan 3 connections on programmer HW on HW off CH on HW on to cylinder stat then HW call to Orange on Mvalve to power boiler and pump HW off to grey wire on Mvalve to close hot water CH to room stat common then heating call to white on Mvalve

Jun 13, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell Programmable Thermostat Display issues


there are currently 60 honeywell thermostats made i have no idea witch one you have , but a lot of the new ones run on batterys you might be seeing a low battery signal . look for a door where batterys might be and replace them

Jan 14, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

My daughters honeywell ch/hw digital control resets to zero


have the batteries died have you got the programmer set back to timer control or is it still in the set mode

Jan 05, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

No hot water honeywell st6400c


HW valve was stuck in the open posiion and the micro-switch was not working so thats why boiler and pump were not starting. Bled system to below the level of the valve to be changed, and replaced valve with a drayton ( easy quick change of valve head if needed no screws )

Sep 07, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell junction Box and QE2 Programmer


Hi check the wiring to the cylinder stat is there power to it then is it going to the valve

May 15, 2008 | Honeywell Programmable Thermostat Heater

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