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Honeywell C21 free user manual download

How to set timer for central heating and hot water

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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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

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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

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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

WHEN SET FOR HOT WATER RADIATORS ARE HEATING ALSO


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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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Dec 31, 2017 | Hardware & Accessories

1 Answer

How do i set the heating/hot water timer on the LP112-24 acl controler ?


The instructions are available here: http://www.draytoncontrols.co.uk/Complete_LP_Installation_User_Instructions.aspx I hope I have been of help but please do not hesitate to ask if you have any further questions. Set the central heating Press the YES button, and the display will ask 'SET CH PROG?'. Press YES and you'll see ON1, the start of your first central heating period. Adjust it in 1-minute steps using the - and + buttons. If the - and + buttons are held down, the time changes in 10-minute steps. Press SET?, and you'll see OFF1, the end of your first central heating period. Adjust this in the same way, press SET?, then repeat the procedure for ON2, OFF2, ON3 and OFF3. Set the hot water When you press SET? after setting OFF3 for the central heating, the display will ask 'SET HW PROG?'. Press YES, then set your times in the same way. Remember, in this mode you can have different times to your central heating if you wish. When you press SET? after setting OFF3 for the hot water, the programmer will return to normal operation.


Feb 19, 2011 | Heating & Cooling

1 Answer

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.

Jun 16, 2010 | Heating & Cooling

1 Answer

I have a Baxi WM old boiler. Hot water only needed


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1 Answer

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Jan 05, 2009 | Heating & Cooling

1 Answer

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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.

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