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10 FAULT FINDING
10.1 CARRY OUT INITIAL FAULT FINDING CHECKS
1.
Check that gas, water and electrical supplies are available at the boiler.
i.e. Inlet gas pressure = 20 mbar
Electrical supply = 230/240 V ~ 50 Hz
CH water system pressurised to between 0.75 and 1.25 bar
DHW flow rate is more than 2.5 litre/min
2.
Carry out electrical system checks, i.e. Earth Continuity, Resistance to Earth, Short Circuit and Polarity with a suitable meter.
Note: These checks must be repeated after any servicing or fault finding.
3.
Ensure all external controls are calling for heat and check all external and internal fuses.
4.
Check that the gas and water pipework has been connected to the correct connections on the boiler and all valves are open.
However, before any servicing or replacement of parts ensure the gas and electrical supplies are isolated.
10.2 CENTRAL HEATING - Follow operational sequence
Alpha CB24/28 - Fault Finding
Summary of Contents for Alpha CB24
Page 27: ...27 9 1 ILLUSTRATED WIRING DIAGRAM Alpha CB24 28 Wiring Diagrams 9 WIRING DIAGRAMS...
Page 28: ...28 Alpha CB24 28 Wiring Diagrams 9 2 FUNCTIONAL FLOW WIRING DIAGRAM...
Page 30: ...30 Alpha CB24 28 Fault Finding 10 3 DOMESTIC HOT WATER Follow operational sequence...
Page 31: ...31 Alpha CB24 28 Fault Finding 10 4 FAULT FINDING SOLUTIONS A to F...
Page 32: ...32 Alpha CB24 28 Fault Finding 10 5 FAULT FINDING SOLUTION SECTIONS G to L...
Page 35: ...35 Alpha CB24 28...