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How do I fix central heating

Can only get hot water or heating, not both. To get hot water, I have to switch both hot water and heating "off" on the timer controller, then switch hot water on. To get heating to work, i have to again switch both hot water and heating "off" on timer controller, then switch heating on. Timer is Honeywell ST9400c and 3 port valve is Honeywell V4073A.

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  • 484 Answers

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.

Posted on Jan 08, 2015

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Posted on Jan 02, 2017

SOURCE: central heating timer

Does it have batteries?

Posted on Apr 05, 2008

  • 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

  • 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

  • 120 Answers

SOURCE: Have a back boiler. Central heating working fine. Hot water not.

Depends on type of control system but usually you will have a three-way motorised valve somewhere. This is contolled by the tiimer and the thermostat on your cylinder. Look for a box that has one pipe going in to it and two further pipes coming out. I suspect yours is stuck on heating. Some models had a manual lever to put it to just hot water. End of the fday you need to get someone out to fix this one.

Posted on Jul 22, 2010

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