Help understanding why boiler keeps coming on
| Support Home | Forums | Reply | Search |
DDC4000 System and DDC420 Controllers Controls Discussion Forum / DDC4000 System and DDC420 Controllers /

Help understanding why boiler keeps coming on

Author Michael M...
Registered
#1 | Posted: 18 Apr 2020 16:44  
Hi,

We've relatively recently bought a house with a DDC420 controller and are struggling to understand some of it's behaviour and wondered if anyone could help. The main problem at the moment is that the boilers seem to fire even when there shouldn't be any demand on them. An example from today, we've had the system on frost mode override to try and have things off but we still keep seeing the boilers running and you can see from the flow temp graph attached that it keeps turning on to keep the flow temp at target despite no demand for hot water or heating (system in frost mode and it isn't anywhere near freezing).

It feels like we are wasting a lot of oil, we've ended up turning off a lot of the 'smart' adaptive features to try and figure out what is going on and then possibly build up back from there but I cannot figure out why the boiler is going on without apparent demand, is this something wrong with the boiler and not the controller perhaps? I think it is on now but the boiler section of the web-controls isn't showing either boiler as 'green' which I interpret to mean the controller is not currently asking for a boiler to fire.




Author Michael M...
Registered
#2 | Posted: 18 Apr 2020 16:46  
More screen shots attavched




Author Dene M...
Registered
#3 | Posted: 30 Apr 2020 07:36 | Edited by: Dene Matthews  
Hello - please call 0800 844 3100 and access the support line for support on this and we can help. It looks as though your boiler is running outside of the demands of the controller on it's own conviction. We will certainly try to help identify the issue.

You can also email us at info"at'syxthsense.com

Change 'at to @'

Look forward to hearing from you
Author Lissie M...
Registered
#4 | Posted: 11 Aug 2020 17:16  
Hi....help me understand, is ther any mechanized valves (zone valves) on framework?
The actuator heads on them fall flat or at times valve shaft can seize. They are most basic deficiency and gotten live connection through their miniaturized scale change to evaporator. Needs someone able in electrics to test wiring utilizing a multimeter
Author Dene M...
Registered
#5 | Posted: 28 Aug 2020 08:28  
Lissie Mayo
Hello Lissie
Please contact the installer or a local controls specialist to investigate your issue. If you can contact us by email we can try to assist in locating one for you. Please send images of your devices.
Author Dene M...
Registered
#6 | Posted: 29 Sep 2020 13:07  
Michael Maibaum
Michael we didnt hear back from you so I trust you identified the issue. From the images you supplied it was shown that the boilers weren't being asked to run by the controller so I would expect the issue to be with the way the boilers are being asked to run or perhaps the boilers have been left to run manually on their own settings.
Author Elaine M...
Registered
#7 | Posted: 12 Dec 2020 15:38  
Hi,

Sorry I totally missed your reply Dene. I eventually traced it down to the underfloor heating (heat miser) controls which turned out to be wired directly into the same relays that the ddc420 uses to control the shunt pumps and boilers, hence turning them on but the ddc420 being outside the control loop and the vt-valve remaining closed. I've come back because I still have some estrangement's but I'll create a different post for that or phone in..
DDC4000 System and DDC420 Controllers Controls Discussion Forum / DDC4000 System and DDC420 Controllers / Help understanding why boiler keeps coming on Top
Your Reply Click this icon to move up to the quoted message
 
 ?

Only registered users are allowed to post here. Please, enter your username/password details upon posting a message, or register first.
 
  Controls Discussion Forum Powered by Bulletin Board Script miniBB ®