GAS valve testing is very difficult this video could help.
Before starting download our APPs ( links below )
F.22 to call tech.support from site
GAS rate to test it’s working correctly and efficiently
GAS pipe size to test the gas supply is correct to all appliances.
The Install manual
Testing: Worcester interface PCB how to use it
How to measure the coil + solenoid
Test: GV 5 pins
Easy to follow
For more info: please use the link below

Our APPs are all one price £4.99 no vat
https://www.mrcombi.com/apps/
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