Observation:

USE THE FULL XSOL MODEL
or
Select from the list below if you are confident that the appliance has reached up to that point in the sequence correctly.
BOILER DOES NOT REACT TO A HOT WATER DEMAND
BOILER DOES NOT REACT TO A HEATING DEMAND
PUMP RUNS ON DEMAND BUT FAN DOES NOT
BURNER NOT LIGHTING ON HOT WATER DEMAND
BURNER NOT LIGHTING FOR HEATING DEMAND
CH OPERATION UNSATISFACTORY
DHW OPERATION UNSATISFACTORY