5
Fault Finding
12
Amendment 6
© Moffat Ltd, August 2015
Blue Seal Evolution Series Electric Dedicated Griddle Ranges
5.2 Fault Diagnosis
Griddle thermostat faulty
Check that there is voltage to terminal 2 of the thermostat.
If no voltage then check wiring and fuse.
Set thermostat to 300°C. Check the voltage out of terminal 1 of
the thermostat. If the voltage is correct and the heating
indicator is on then check all wiring to element.
Element faulty
Disconnect all wires from the element and check the resistance
(ohms) across the element when cold.
Griddle Element 28.8 ohms.
An open circuit indicates a faulty element coil - replace element.
If above readings are correct check insulation resistance of each
element coil by checking each element terminal to earth /
ground or conduct a megger or dielectric withstand test on
element. A short to earth / ground indicates a faulty element -
replace element.
If element passes above tests, check the wiring.
5.2.1 Griddle Does Not Operate
Energy regulator faulty
Check voltage between Terminal P1 and Terminal 4 of energy
regulator. If no voltage, check the wiring.
With switch in ‘Off’ position there should be no voltage at
Terminal 2 (open circuit between Terminal P1 and Terminal 2).
With control set to a LO to HI heat setting, Terminal 2 should be
switched ‘On’.
If not energy regulator is faulty - replace energy regulator.
Above checks can be made with or without electrical supply
switched ‘On’, with electrical supply switched ‘On’, Terminal 2
element supply will cycle ‘On / Off’ at different time ranges
dependent on control setting.
To check for correct energy regulator ‘On / Off’ cycling,
electrical supply needs to be turned ‘On’.
With control set to full on (HI) position, Terminal 2 (power to
element) should be ‘On’ continuously. With control set to
position 2½, Terminal 2 (power to element) should cycle ‘On’
for approx 15 seconds and ‘Off’ for approximately 30 seconds.
Lower settings will give longer ‘Off’ times and shorter ‘On’ times,
whilst higher settings will give shorter ‘Off’ times and longer ‘On’
times.
Top element faulty
With the thermostat ‘On’, heating, and energy regulator set to
maximum position, check voltage across top element terminals
at right hand side of oven.
If voltage is correct, check current draw of element. If there is
no current draw, element is faulty - replace element.
NOTE:
Correct top element current draw:
220 - 240V: 12.5A ± 5%
Alternatively, disconnect wires from the element terminals, and
check the resistance of the element. An open circuit indicates
that the element has failed.
Correct element resistance: 19.2 ohms.
5.2.2 No Top Heat / Too Much Top Heat
5.2.3
No Oven Temperature Control
Thermostat Faulty
With thermostat in ‘Off’ (vertical) position, heating indicator
should be ‘Off’. If not, thermostat is faulty - replace thermostat.
Check that the thermostat phial is in the correct location and
check for a broken capillary tube - replace if thermostat phial or
capillary tube is damaged.
Place an accurate digital thermometer probe in centre of oven.
Set thermostat to 180°C. Close oven door and allow oven
thermostat to regain temperature. If temperature overshoots
by 50°C and continues rising, switch ‘Off’ oven and replace
thermostat.
Содержание Evolution EP506
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