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I need a user manual for Honeywell ST6400c programmer

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ST6400C programmer, heating switched off. Switch hot water on only, tank full of hot water but pump runs and radiators get hot. Wall stat is set at zero. When programmer is touched and the flap dropped to...


Have had a lot of these programmers with this fault.Integral fault with electronics.Programmer will need to be replace as unrepairable.You should be able to find a straight replacement version from your heating supplier.

May 11, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

My st6400c Honeywell programmer blank. Mains turned of whole day. Now back on, but st6400c blank.


Have you tried pressing the 'Reset' button (with the tip of a pencil)? After doing this, you will have to re-enter the various times. It could be that your rechargeable battery is nearing the end of its useful life, by the way.
George

Feb 23, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

St6400c thermostat wont run the central heating independantly


This does not sound like a thermostat problem. I would be looking for a zone valve or circulator pump problem.

Nov 05, 2009 | Honeywell Programmable Thermostat Heater

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Honeywell ST6400C central heating programmer fault


you may vae to enter a different "Mode" to change the time....also try removing the batteries for 10 minutes and then reprogram the thermostat again

Oct 25, 2009 | Honeywell Electronic Programmable...

2 Answers

User manual for Honeywell ST6400C


Honeywell ST6400C
Times set on thermostat does not turn on or off the heating or hot water at the set times, but any time of the day

Sep 17, 2009 | Honeywell Electronic Programmable...

1 Answer

Honeywell ST6400C - hot water not working


some digital thermostats do no not work with zone valves is this a new thermostat that you had installed

May 08, 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 ST6400C programmer


Hi yes sound like it not working on hot water only it would check ou the wiring on this side

Jul 25, 2008 | Honeywell Programmable Thermostat Heater

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