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6. Fault Finding - Page 38
Preliminary Actions:
a. Set Boiler Switch to Standby. - b. Set Heating switch to 'OFF' (Centre) -
c. Turn OFF all Hot Water Taps - d. Ensure all Isolating Valves at base of appliance are OPEN
e. Turn ON EXTERNAL GAS and ELECTRICAL Supplies - f. Arrange for system controls to be calling for heat
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