In message ,
TheScullster writes

"John Stumbles" wrote

What does it say in the Installation and Servicing Manual which was
(by law) left with your boiler?


The install instructions give the following:

Fault - Volatile Lockout (sensor, fan or code plug)
Possible solution/check - Temp sensor 8000-20000ohm
- Wiring/connections to sensor
- Fan/cable/connections
- Code plug fitted

No idea what a code plug is!
Any thoughts on this lot?

The code plug normally identifies to the processor which particular
appliance it's driving

I don't know on the greenstar

--
geoff