Glow worm ultracom 30cxi ignition problem

[Gemlew]

Hi, I am new to the forum and as a new home owner have a rather basic understanding of central heating systems!

We have a main house and separate annexe which are supplied by two separate thermostats (Drayton digistat 2) which both run off the glow worm boiler. Without warning our heating did not turn on yesterday for the main house. The thermostat communicates with the receiver, there is an audible click and yet the heating does not turn on. I have tested the main house receiver on the annexe heating, which works without issue meaning it is unlikely to be a capacitor fault in the receiver as I have read that they are common. It also means that the boiler is firing without issue to heat that part of the annexe. I have attached a photo of our current set up. Using my limited knowledge I can only think that the fault lies within the tower control panel in between the receiver and the boiler, as the boiler is connected from the tower control panel by only one lead. Anyhow I shall upload the picture and hope that makes a bit more sense! Any advice is greatly appreciated. Thank you

 

[ShaunCorbs]

Zone valve issue I would say

 

[Gemlew]

Zone valve issue I would say

Thank you for replying... Would a zone valve issue lead to the boiler not firing? As I have the receiver go green, the click and then no firing up. In my head if it was a zone valve the boiler would fire but there would be no flow as it would be stopped by the valve. But I am making it up as I go along! If you could explain that would be great! Thanks

 

[king of pipes]

Have you changed the batteries in the thermostat ? Could be a cheap fix

 

[ShaunCorbs]

Thank you for replying... Would a zone valve issue lead to the boiler not firing? As I have the receiver go green, the click and then no firing up. In my head if it was a zone valve the boiler would fire but there would be no flow as it would be stopped by the valve. But I am making it up as I go along! If you could explain that would be great! Thanks

zone valve is next in the sequence

receiver
Zone valve
Boiler

 

[Harvest Fields]

As said above. If not a receiver issue, then zone valve

 

[Gemlew]

Thanks that is really helpful, I shall have a look into it!

 

[Danb]

Agree with the lads above if one side of your system works but other side doesn’t would automatically look at your 2port, its not making the switch to run pump inside your combi to start the boilers
ignition sequence.

 

[Gemlew]

Sorry one late reply as I was away on holiday before attempting to fix - I had forgot to mention that although the heating is not working for the main house, the hot water has been fine. Would this still be consistent with a zone valve issue or would this make it unlikely? Thanks

 

[Harvest Fields]

Yep. Zone valve or timer issue.