Worcester Greenstar 24i Condensing boiler (see pic 1) approx. 10 years old. Normally most boiler problems resolved myself, this however has me stumped.
Boiler appears to be working fine. The Honeywell controller (see pic 2) successfully activates the boiler once a day to heat up a tank of hot water (large copper cylinder ‘vented’ fed by storage tank water loft) on automatic. Alternatively activating the hot water ‘ad hoc’ via same controller also works fine. So in my mind there is no actual fault with the boiler operation.
Problem arises when activating the heating. Request heating, the value (see pic 3) opens (audible) and the light on the Honeywell controller remains on for heating operation. However the boiler fails to fire up.
This issue has happened on many previous occasions primarily as the Drayton digistat (see pic 4) is either turned down too low (no flame on display), the batteries are failing (same device) hence the wireless signal fails to reach the Drayton digistat SCR control box (see pic 2) or indeed an error has appeared on aforementioned control box (simple power off/on reset resolves). I’ve addressed all these issues yet the problem persists.
Convinced the boiler is not at fault, assumed it must be the digistat. Removed the front housing of the digistat SCR (see pic 5) and bridged the connection manually (see pic 6 – indicated by red line) with wire then operated the heating via Honeywell controller. Same thing happens, valve (pic 3) opens, Honeywell controller heating operation light remains on but the boiler fails to fire up.
At this point I’m at a loss. The signal to the boiler to fire up must be the same whether you require hot water / heating, the only difference is which value (pic 3) is open to direct the flow of heated water.
What am I missing here please.
P.S. My thanks in advance for any responses. Small gift sent in the post to the first poster who successfully resolves the issue (chocolate btw in case your on a diet).
Boiler appears to be working fine. The Honeywell controller (see pic 2) successfully activates the boiler once a day to heat up a tank of hot water (large copper cylinder ‘vented’ fed by storage tank water loft) on automatic. Alternatively activating the hot water ‘ad hoc’ via same controller also works fine. So in my mind there is no actual fault with the boiler operation.
Problem arises when activating the heating. Request heating, the value (see pic 3) opens (audible) and the light on the Honeywell controller remains on for heating operation. However the boiler fails to fire up.
This issue has happened on many previous occasions primarily as the Drayton digistat (see pic 4) is either turned down too low (no flame on display), the batteries are failing (same device) hence the wireless signal fails to reach the Drayton digistat SCR control box (see pic 2) or indeed an error has appeared on aforementioned control box (simple power off/on reset resolves). I’ve addressed all these issues yet the problem persists.
Convinced the boiler is not at fault, assumed it must be the digistat. Removed the front housing of the digistat SCR (see pic 5) and bridged the connection manually (see pic 6 – indicated by red line) with wire then operated the heating via Honeywell controller. Same thing happens, valve (pic 3) opens, Honeywell controller heating operation light remains on but the boiler fails to fire up.
At this point I’m at a loss. The signal to the boiler to fire up must be the same whether you require hot water / heating, the only difference is which value (pic 3) is open to direct the flow of heated water.
What am I missing here please.
P.S. My thanks in advance for any responses. Small gift sent in the post to the first poster who successfully resolves the issue (chocolate btw in case your on a diet).