Table of error codes as follows 
e20 central heating ntc fault
e28 rue ntc fault
e50 hot water ntc fault
e110 safety thermastsat operated
e119 water pressure switch not operated
e125 circulation fault primary circuit
e130 rue ntc operated
e133 interuption of gas supply or flame failure
e160 fan or wiring failure 
 No e 168 sorry
                
 Graham
                
 November 2009