Does anyone know where I can get the circuit diagram for a controller used for a Potterton Suprima? The markings for the controller are as follows:- LMU30.211B159. I'm an electronics engineer. Do you know where I can download the manual for this controller to help explain what the various colours mean on the led:-

Flashing red led
steady green led
flashing green led
Flashing yellow: steady green but with a flasing red led in the background

Mike, November 2010

www.partsarena.com/baxi

Ian, November 2010

Potterton belong to Baxi - Baxi might supply you with an intsallation and fault finding guide for your boiler - I doubt they allow the PCB drawings into the public domain.

The part number you quote is a Siemens number LMU30.211B159. - Potterton's number for this is 5112178.

Electrolytic capacitors are the weak link - see this repair story on an older Potterton boiler...

http://kaijaks.co.uk/blog/nick/2008/02/10/dodgy-old-boiler

Good luck...

Peccavi, November 2010