-23-
Revision 5/F3534
©
Moffat Ltd, April 2005
Turbofan Convection Oven
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.
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.
Alternately, perform a continuity test across the
terminals with the light switch depressed.
NOTE:
Units from S/N 260862 use a latching
type
switch.
Units up to S/N 260861 use a
momentary type switch.
6.1.5 NO WATER INJECTION / STEAM
(US/CANADA
ONLY)
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
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 cor-
rect, then the motor is faulty—replace.
