Central heating problem..

[wolfUK]

Hi,

I'm having a problem my my central heating, of which i thought might be the mid position actuator from reading variouse posts across the net.
Dont think this is the case as i have now replaced with a new one and still the problem persists.
I'm getting a buzzing noise from the Horstman cenruarplus 21 control panel when selecting C/H. I was also getting a very slow drip from the Drayton Actuator. On turning off all power and replacing the Actuator this seemed to do the trick for all of 5 mins and then The buzzing returned and C/H once again cut out.

Any ideas would be most appreciated The wife and Kids are complaining of the cold.

 

[Galoka]

What was the problem that meant you thought the mid position valve was faulty?

Anyway, buzzing from the programmer suggests a faulty programmer, when you say the CH cuts out does it appear to be the programmer switching off or something else happening.

I would probably start by removing the programmer from the backplate and then connecting the live to the call for CH terminal with a jumper to see if the CH works ok.

 

[wolfUK]

Hi Thanks for reply,

The Control panel lights are on, but all we get is a buzzing noise coming from the Control panel when you select either C/H and now also H/W.
Dont hear the pipe's or Boiler fire up like we used to when switching on either of them on. When i changed the Actuator yesterday it seemed like it had cleared the problem. But after a few minutes i stopped the 24hr programe (which i selected to test if it was working) to reset the programe times for when i require H/W and C/H to come on during a day.
Once i had done this the C/H should have came back on with the time setting, But once again the Control panel Buzzing came back and The boiler never kicked in.
Tried Both H/W and C/H switching on independantly and neither are starting up and just get the buzzing from control panel.

 

[Galoka]

Does sound very much like knackered programmer.

I would do the test as I suggested - as that will by pass the programmer, and confirm everything else is working ok first

But you could just replace the programmer.

 

[wolfUK]

Hi again.

Ok lastest update is. buzzing has stopped but nothing seems to happen when selecting any prgramme for C/H and H/W.
Could the programmer be dead although the display and buttons still seem to work fine.
There is a battery in the rear that i think is dead. as when removing power the display goes out and this should remain lit im guessing if the battery was good.

 

[wolfUK]

Hi sorry didnt see your post when i was writing the last. Thanks very much for your help.
I dont have anything to do your test unfortuanately around the house.
Think maybe ill go buy a progammer.


Quick edit...

Should i replace like for like. Or would you suggest other.
Its a Horstmann Centaurplus C21 unit.
And looking at the back panel and insturction manual It's wired up for, Fully Pumped system using roomstat, Cylinder stat and 3 port Mid-Position valve.

 

[wolfUK]

Hi again.

Just wanted to say thankyou very much for your help.
Got in contact with Horstmann to see if their was a compatible programmer.
Was told the C27 programmer was basically an upgrade of the C21 basically it does a 7 day programme rather than 24hr. Back plate and wiring exactly the same, so got this from our local Screw Fix as the C21 was a little harder to source and would have to wait for delivery. Managed to do your test and that was working all good.
Thanks once aagain very much.