Ariston GENUS 27 PLUS Installation Instructions Manual page 22

TABLE OF CONTENTS
2
1. SERVICING INSTRUCTIONS
1.1 Replacement of Parts
1.2 To Gain General Access
1.2.1 Removing the front panel
1.2.2 Removing side panels
1.2.3 Removing the control panel door
1.3 Access to the Combustion Chamber
1.3.1 Removing the sealed chamber front cover
1.3.2 Removing the combustion cover
1.3.3 Removing the burner and injectors
1.3.4 Removing the electrodes
1.3.5 Removing the main heat exchanger
1.3.6 Removing the air pressure switch
1.3.7 Removing the fan
1.4 Servicing and Removal of the Gas Valve
1.4.1 Setting gas pressures
1.4.2 Removing the spark generator
1.4.3 Removing the gas valve
1.5 Access to the Water Circuit
1.5.1 Removing the main flow switch
1.5.2 Removing the pump pressure switch
1.5.3 Removing the safety valve
1.5.4 Removing the automatic air vent
1.5.5 Removing the pump
1.5.6 Removing the pressure gauge
1.5.7 Removing the expansion vessel
1.5.8 Removing the overheat thermostat
1.5.9 Removing the heating temperature sensor (N.T.C.)
1.5.10 Removing temperature and pressure relief valve
1.5.11 Removing the D.H.W. probe
1.5.12 Removing the diverter valve
1.6 Access to the Control System
1.6.1 Checking the Fuses
1.6.2 Removing the Time Clock
1.6.3 Removing the P.C.B.s
2. FAULT FINDING
2.1 Fault Finding Guide (Flow-chart)
3. ELECTRICAL DIAGRAMS
4. SHORT SPARE PARTS LIST