49
WARNING
Always isolate the boiler from the electrical supply before
carrying out any electrical replacement work.
Always check for gas soundness after any service work.
NOTE:
Before trying to operate the boiler make sure that :
• All gas supply valves are open and that the gas supply has
been purged of air.
• There is a permanent mains supply to the boiler.
• There is a heating demand from the external controls.
14 Fault Finding
Electrical Testing
Should there be any doubt about the voltage supply to any of
the components, it is possible to carry out a simple electrical
test.
IMPORTANT:
On completion of the Service/Fault Finding
tasks which have required the breaking and remaking of the
electrical connections, the earth continuity, polarity, short
circuit and resistance to earth checks must be repeated using
a suitable multimeter.
To carry out the electrical test, gain access, as follows:
Remove the tank module front panel to gain access to the
boiler module front panel securing screws, see diagram 13.1.
Hinge down the control box and unclip the cover to gain
access. Refer to the wiring diagram 14.1 and fault finding
charts, diagrams 14.2 to 14.5.
13119
Diagram 14.1
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