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Honeywell st1000 The central heating is not working including hot water

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 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

heatman101
  • 43501 Answers

SOURCE: 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.

Posted on Nov 12, 2009

  • 767 Answers

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

  • 36 Answers

SOURCE: boiler is a baxi control for heating is honeywell.

this will be your diaphram inside your divertor valve.
the one that looks like a spaceship.
it will e split.

Posted on Jan 31, 2010

  • 2458 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

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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.

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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.

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Boiler is a baxi control for heating is honeywell.


this will be your diaphram inside your divertor valve.
the one that looks like a spaceship.
it will e split.

Oct 05, 2009 | 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

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Honeywell T403A1174 suddenly doesn't appear to call for heat


some times inside the boiler on the internal pipework you will see little sensors, on the central heating piping there sometimes is a thermastic sensor on side of flow pipe with a little reset button on ? i guess with the problem you said the poiler locked out and the pipe work overheated ? this is a safety feature on some boilers not, all and easerly reset via this button ?

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Honeywell ST6400C programmer


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

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