Observation:

Please select from the appropriate fault code below:
F54 Gas pressure fault
F57, F67, F68 Rectification fault
F61 Gas valve regulation (electrical short)
F63, F65 Electronics overheated or defective
F72, F83, F84 Temperature differential related fault
F73 Water pressure signal in the wrong range (too low)
F74 Water pressure signal in the wrong range (too high)
F75 No pressure change detected on pump start-up
F76 Safety switch off heat exchanger temp
F83, F84 Temperature change fault
F85 Sensors incorrectly fitted
F93 Gas group fault (emissions)
Communication Fault Communication between main and display PCB