Specifications

TM036 Vermont Gas Fireplace & Gas Log Fire Service Instructions REV: A
D.O.I: 17/01/2008
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Fault Finding Chart 6.3
Electrical Insulation Testing
There are three basic test procedures that should be carried out when the operation and
function of a Vermont gas fireplace or gas log fires electrical system is in doubt.
Procedure 1: Insulation resistance of the water heater Neutral Circuit. (Reading not
to be below 1 Mega ohm).
1. Isolate power to the log fire by switching off power point and unplugging the 3
pin plug from the power point.
2. Connect megger leads to the Neutral and Earth pins of the log fire 3 pin plug.
3. Operate megger. A reading above 1 Mega ohm should be obtained.
4. If a reading below 1 Mega ohm is indicated, all component parts will need to be
individually tested to locate the fault. Refer to Fault Finding Chart 6.3 above.
Procedure 2: Insulation resistance of the log fire Active Circuit (reading not to be
below 1 mega-ohm).
5. Connect megger leads to the Active and Earth pins of the log fire 3 pin plug.
6. Operate megger. A reading above 1 Mega ohm should be obtained.
7. If a reading below 1 Mega ohm is indicated, all component parts will need to be
individually tested to locate the fault. Refer to Fault Finding Chart 6.3 above.
Procedure 3: To check “Continuity” of the log fire electrical circuit.
8. Set megger to resistance scale or multimeter to x1 resistance scale.
9. Measure between the Active and Neutral pins of the log fire 3 pin plug. The resistance
should be approximately 27.1 ohms. If a reading outside this resistance value is
obtained all electrical component parts will need to be individually tested to locate the
fault. Refer to Specifications table on page 4 for indicative resistance values of
components.
10. Reinsert 3 pin plug into power point and switch power point on. Note: If continuing
with any diagnostic procedures do not perform this step.
Electrical Insulation Test
Is the
reading below 1
mega-ohm?
NO
YES
YES
Disconnect the wiring from the
transformer and megger
between each terminal on the
transformer and earth.
Replace transformer.
Replace fan assembly.
Check for pinched or
damaged wiring touching
the Log fire chassis.
Disconnect the wiring from the
fan and megger between each
terminal on the fan and earth.
Disconnect the power supply
wiring from the gas valve and
megger between each power
supply terminal on the gas
valve and earth.
Is the
reading below 1
mega-ohm?
Is the
reading below 1
mega-ohm?
YES
NO
6.3
megger between the log fire 3
pin plug active pin and earth.
Then megger between the 3
pin plug neutral pin and earth.
Is either
reading below 1
mega-ohm?
Faulty power circuit. Advise
customer to have
electrician check household
power circuit.
NO
YES
Replace gas valve.
NO