-22-
Revision 2/F3509
6.1.10 NO TEMPERATURE CONTROL
(TEMPERATURE OVERRUN)
Heating contactor faulty
Refer 6.1.9
Thermostat faulty
With thermostat in off (vertical) position, the
6.1.11 SLOW RECOVERY
Thermostat out of calibration
Place an accurate digital thermometer probe
in centre of oven. Set thermostat to 180°C or
355°F. Close the oven door and allow oven
thermostat to cycle on and off twice. Record
oven centre temperature for the next
thermostat on and off cycle. The thermostat
should cycle on and off between 165°C and
195°C or 330°F and 385°F when set to the
above temperature. If oven temperature is
outside these ranges, then the thermostat
requires recalibration.
NOTE: Thermostat cycling span should be
±15°C or 27°F
Indicator faulty
Check the voltage across the indicator termi-
nals. If the voltage is correct then the indica-
tor is faulty—replace.
If there is no voltage then check wiring.
6.1.12 NO THERMOSTAT HEATING
INDICATOR
No power to timer
Check the voltage at terminal 5 on underside
of the 180 minute timer.
Check that one lead of timer motor is con-
nected to terminal five of timer and the other
lead is connected to neutral of ‘Roast ’n Hold’
switch.
If voltage at terminal 5 is correct and wiring is
correct then the timer motor is faulty—replace
timer.
If there is no power at terminal 5, check for
power supply at terminal 4 of timer. If there is
voltage at terminal 4 and not at terminal 6 with
timer set, then timer switch is faulty—replace
timer.
6.1.13 ROAST TIMER (180 MINUTE) WILL
NOT TIME DOWN
Figure 6.1.5
Terminal 4
Terminal 1
Terminal 2
Terminal 5
Terminal 3
Terminal 6
Terminal A1
Terminal 3
Terminal 2
Terminal A2
Terminal 1
Terminal 4
Figure 6.1.4
tactor coil is on. Correct operation will make
an audible noise when closing contacts and
on the front face of the contactor the contact
mechanism will visibly pull in. If not, contactor
is faulty—replace.
If contactor operates correctly, check continu-
ity through the poles of the contactor when
closed. If no continuity through connected
poles then contacts are blown and contactor
requires replacing.
For checking elements where temperature
overrun is occurring, check that contactor re-
leases (opens) when thermostat is switched
OFF. If not, contacts of the contactor have
welded shut and elements will be ON and
heating will be continuous. Contactor is
faulty—replace.
Element faulty (blown)
With the thermostat on and heating check
voltage across element terminals at RH side
of oven. If the voltage is correct then check
the current draw of element. If there is no cur-
rent draw then element is faulty—replace.
If there is no voltage then check voltage is be-
ing supplied to each element coil from the
heating contactor. If no voltage to elements,
check contactor operation (refer 6.1.9) and
wiring.
NOTE: Correct element current draw:
208 V : Inner Coil 12.9A ± 2.5%
Outer Coil 15.0A ± 2.5%
220 V : Inner Coil 13.6A ± 2.5%
Outer Coil 15.9A ± 2.5%
240 V : Inner Coil 12.5A ± 2.5%
Outer Coil 14.6A ± 2.5%
heating indicator should be off. If not then the
thermostat is faulty—replace.
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