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13 Fault Finding
Diagram 13.2
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Before trying to operate the boiler make sure that :
• All gas supply cocks are open and that the gas supply has
been purged of air.
• The heating system pressure is at least 0.7 bar.
• Check filters are clean.
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: If the DHW control is set for pre-heat the boiler will start
as soon as power is supplied to it, if there is no heating demand.
Should there be any doubt about the voltage supply to any of the
components, it is possible to carry out a simple electrical test to
ensure all is operational in that area.
To carry out the electrical test, gain access to the Control Box
PCB, as follows:
Hinge down the control box.
Remove Torx screws and unhook the rear panel.
For layout of PCB, see diagram 12.1.
START
