Specifications

TM013 Vulcan Electric Service Instructions REV: D
D.O.I.: 05/09
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14
Power Supply
No Hot Water
Power Diagnostic
Twin Element DiagnosticSingle Element Diagnostic
YES
Is 240 volts present at the
terminal block?
TERMINAL BLOCK TEST
Is the water heater connected
to an off peak tariff?
Is the isolating
switch turned off?
Is the fuse(s) blown at the
switch board?
NO
Isolate power and continue with
following diagnostic procedures.
Electrical Insulation Diagnostic
Possible failure of the off peak relay or
missed signal from energy supplier.
Continue with diagnosis to confirm
water heater is operational
YES
NO
Restore power and advise customer YES
NO
Fault in household electrical
wiring.
Continue with diagnosis to confirm
water heater is operational.
NO
YES
Conduct an electrical insulation test.
Refer to the section on „Electrical
Insulation Testing‟.
Is the reading below 1MΩ?
YES
NO
TWIN ELEMENT MODELS
Complaint may be due to the booster
circuit also being controlled by the off
peak relay.
Connect to continuous tariff