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Honeywell C21 free user manual download

How to set timer for central heating and hot water

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: honeywell T8400c thermostat went blank. central

I would check the batteries in the thermostat. If the batteries are okay then you might have a blown fuse in the furnace or the furnace lost power check the breaker.

Posted on Jan 21, 2010

  • 16 Answers

SOURCE: 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

Posted on Aug 17, 2009

  • 2 Answers

SOURCE: I have a Honeywell ST499A/ST699B

I have an old Honeywell ST499A/ST699B thermostat. It still works OK but when we have a power cut I have to re-programme everything. Presumably this is because the battery needs replacing. I cannot find a way of opening the control box to get into the unit to replace the battery and in any case I’m not sure if the battery is renewable?

Posted on Dec 28, 2009

  • 2457 Answers

SOURCE: Honeywell ST6400C programmer

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

Posted on Feb 18, 2010

  • 1 Answer

SOURCE: 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

Posted on May 20, 2011

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1 Answer

How do I fix central heating


The first thing you need to substantiate is the fact that there is enough water in the system. It will be a closed loop system requiring approximately 10 psi/ floor. (Only a rule of thumb). Usually when one protion of the system works and the other does not, it is an issue of water quantity available to circulate through the combination of loops. If you have to add water, you will probably have to purge air from the highest points in the system. Even if there is an "Airtrol" fitted in the bottom of the expansion tank, bleeding the high points will eliminate air quicker.

The hot water portion of the loop should only be going through a heat exchanger that transfers the loop temp to the domestic water circuit and the three way valve is probably a 'mixing valve' utilized to maintain a certain loop temperature on the primary loop.

Dec 01, 2014 | Honeywell Heating & Cooling

1 Answer

Cannot set timer on central heating/water system.


HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Jul 27, 2010 | Honeywell Heating & Cooling

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

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

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

Honeywell Central Heating Timer ST699


In the end I bought another timer on sale/return. My heating didn't work with that one either, so my problem's not the timer but something else.

Aug 26, 2008 | Kitchen Appliances - Others

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