Clicking noise from Worcester Greenstar 12Ri boiler

[Shaun 72]

We currently have a Worcester Greenstar 12 Ri condensing boiler which is nearly 4 years old. A problem has started recently any help or advice would be greatly appreciated.
When we select to have our hot water on for an extra hour the boiler burner ignites ok when the temperature drops to the set value. When the burner stops a clicking noise can be heard from the boiler eventually it stops and the blue light flashes. When we try to rest the boiler it starts clicking again and the blue light flashes again. The only way we have discovered how to overcome this problem is to turn the boiler off and switch the heating on, we then turn the boiler on and wait for the burner to ignite. When the boiler has been running for a short time we can switch the heating off and the blue light will remain illuminated. This whole process will repeat itself when the boiler comes on again for the hot water. Help needed please....

 

[Blake]

Hi Saun,

Take a look at this thread it may help :

http://www.ukplumbersforums.co.uk/central-heating-forum/7022-greenstar-12ri-clicking-overrun.html

 

[Worcester Bosch]

Hi, this is Worcester, Bosch Group

Although we don't currently offer live technical support online, our Technical Support department will be able to help. Their number is 0844 892 3366 - they're open 6 days a week and on average answer calls within 20 second. If you want to know more about our Technical Support department visit our website: Customer technical support - Worcester, Bosch Group UK installer site

We look forward to helping you

 

[robo1024]

Phoned Worcester Bosch technical and apparently this is a common problem which develops on the early boards. Tel 0844 892 3366

Recommended solution is to fit 0.47uF (275V AC X2 rated) capacitor across switched live and neutral. Maplins supply the item for £1.74 part No N27CM

I solder a couple of leads to the capacitor and connected it between the switched live (3rd on RHS on ST2) and nuetral (3rd on RHS on ST1) Page 47 on my Greenstar Ri manual shows the circuit board digm. No more annoying clicks and lock outs. Certainly cheaper than a £230 for a new circuit board.

http://groups.google.co.uk/group/uk.d-i-y/browse_thread/thread/7fa64bc8c0dd70e5

Basically it seems the small current passed by Honeywell-type mid-position valves (presumably by that 680K or whatever resistor?) can fool the electronics of these boilers (and maybe some other models? & other makes even?) into thinking they have call-for-heat at their switched-live input.

Rob

 

[stateit]

Phoned Worcester Bosch technical and apparently this is a common problem which develops on the early boards. Tel 0844 892 3366

Recommended solution is to fit 0.47uF (275V AC X2 rated) capacitor across switched live and neutral. Maplins supply the item for £1.74 part No N27CM

Point of info:

Maplin part # is N72CN