POTTERTON PUMA 80E 100E ELECTRONICS MODULATION BOARD PCB 21/18601 929686.
This part fits following boilers:
POTTERTON COMBI 100
POTTERTON COMBI 80
POTTERTON PUMA 100E (SIT/HONEYWELL)
POTTERTON PUMA 80 E (SIT/HONEYWELL)