These Plessey / Vernitron units are no longer made, but were fitted to many gas appliances including Gas Fires, Boilers, and Gas Cookers.
Potterton Netaheat part numbers: 407654, 407620 or 407629
We have a very small stock of these left for direct sale (no need to send us your old PCB).
When these are gone we do not know when and if we will get any more.
2 Year Guarantee on all our reconditioned PCBs.