Search my own database of fault, diagnostic and status codes to aid in fault identification.
24vDC at gas valve?
Is there 230v on Br/Bl to the fan? If not, PCB.
25 degrees = 10K :: 85 degrees = 1K
0 degrees = 32K :: 15 degrees = 15K :: 30 degrees = 8K
^t across flow and return in excess of 30 degrees, or overheat stat has triggered. Can also be triggered on a PCB replacement where the BCC chip has not been re-fitted.
Check gas valve outer pins for 4K Ohms (+/- 2)
Check ionisation probe
