-19-
Revision 2/F3506
6.1 FAULT DIAGNOSIS
Incorrect electrical supply
Check that the voltage across phase and
neutral (L1 and L2) terminals of terminal block
is the voltage as stated on the unit’s electrical
rating plate.
If incorrect, check electrical connection of
supply wiring and / or check electrical supply.
6.1.1 OVEN DOES NOT OPERATE / START
Power switch faulty
Check if power switch latches. If the switch
does not latch, then switch is faulty—replace.
With switch latched, check voltage across
terminal one to terminal three or four. If there
is no voltage, check for fault in wiring.
Check voltage across terminal two to terminal
three or four. If there is no voltage, then
switch is faulty—replace.
NOTE:
When power switch is latched, it
should illuminate if operating
correctly.
6.1.2 FAN DOESN’T OPERATE
Microswitch out of adjustment
Open oven door and manually depress door
microswitch actuator at top right of oven. If
this activates the fan, then the microswitch
actuator arm at rear of oven requires
adjustment.
Microswitch faulty
Check voltage across microswitch terminals to
neutral.
With the door closed there should be power to
the com terminal and the n.o. terminal.
With the door open there should be power to
the com terminal and the n.c. terminal.
If not, microswitch is faulty—replace.
Fan motor faulty
Check the supply voltage across motor
terminals. If there is no voltage then check
the electrical connections of supply wiring.
If voltage is correct then check the oven fan
for free rotation. Remove any obstruction.
If fan is free to spin and the voltage supply is
correct, then the motor is faulty—replace.
6.1.3 OVEN LIGHT NOT ILLUMINATING—
DOOR OPEN
No power to light
Check the supply voltage across lamp
housing terminals at rear of oven. If the
voltage is correct, replace the bulb (if faulty).
If the bulb is OK, check lamp housing.
Replace if faulty.
If there is no voltage, open oven door and
manually depress door microswitch actuator
at top right of oven. If this activates the fan,
then the microswitch actuator arm at rear of
oven requires adjustment.
Check voltage across micro-switch terminals
to neutral.
With the door closed there should be power to
the com terminal and the n.o. terminal.
With the door open there should be power to
the com terminal and the n.c. terminal.
If not, microswitch is faulty—replace.
6.1.4 OVEN LIGHT NOT ILLUMINATING—
DOOR CLOSED
Light switch faulty
Check voltage to the bottom terminal of the
switch. If there is no voltage, then check
wiring.
With switch depressed, check voltage at top
terminal. If there is no voltage, then replace
the switch.
If voltage is correct, then check wiring to light.
NOTE:
Alternately, perform a continuity test
across the terminals with the light
switch depressed.
6.1.5 NO WATER INJECTION / STEAM
Fault with water valve
Check voltage supply across the water valve
solenoid coil with the steam switch depressed.
If there is no power supply then check the
control panel steam switch.
Microswitch
n.o.
com
n.c.
Figure 6.1.1