Viessmann 200 and 222 fault fault codes

17 codes from the Viessmann manual for the 200 and 222 fault gas boiler. Pick one for what it means, the likely causes and where to start.

Code	What it means
2	Gas supply no/low gas pressure detected
33	Power supply voltage is below minimal operating level; internal fuse failure
8	Flue gas temperature has exceeded the monitoring limit
E3	Heat transfer too low during calibration
E8	Ionization current lies outside the permissible range
EA	Ionization current outside permissible range during calibration (deviation too great)
EB	Repeated flame loss during calibration
EE	At burner start, flame signal is missing or too weak
EF	Flame is lost immediately after it has built (during the safety time)
F1	Maximum flue gas temperature exceeded 230°F (110°C) limit
F2	Fixed high limit switch open (activated)
F3	Flame signal already present at burner start
F9	Fan speed too low during burner start
FA	Fan not at standstill
FC	Gas valve faulty or faulty modulation valve control; or vent system blocked
FE	Damaged or incorrect boiler coding card or main PCB
FF	Internal fault or reset button R blocked