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Revision 4/F3591 © Moffat Ltd, August 2004
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.
Power switch faulty
With switch on, check voltage at terminal 1 of
switch. If there is no voltage, check for fault in
wiring. Check voltage at terminal 2. If there is
no voltage then the switch is faulty - replace.
6.1.1 OVEN DOES NOT OPERATE / START
6.1.2 FAN DOESN’T OPERATE
Fan switch faulty
Check that the thermostat has power to
terminal 5 on switch body on the front of the
thermostat when power switch is ON. If no
voltage check wiring. Check that terminal P5
has power switched to it when the thermostat
is turned on. If no power to P5 then switch is
faulty and thermostat complete with switch
needs to be replaced.
Microswitch faulty / out of adjustment
Remove the right hand side panel to allow
access to the microswitch. With the
thermostat switched on and door closed,
check voltage to terminal com of microswitch.
If no voltage check wiring to thermostat.
If voltage correct then check voltage at
terminal n.c. If no voltage then manually
activate microswitch by bending the activator
arm. If microswitch cannot be activated then
it is faulty - replace. If the microswitch can be
manually activated then it should be adjusted.
6.1.3 NO HEAT / ELEMENTS NOT
WORKING (FAN OPERATES BUT NO
HEATING INDICATOR)
No power to thermostat
With the thermostat ON and the roast switch
OFF, check for power at terminal 1 of the
thermostat. If no power then check that
power is being supplied to the roast switch
(terminal 2).
Thermostat faulty
With thermostat turned on (in a cold oven)
check for voltage at terminal 2 of the
thermostat. If no voltage at terminal 2, but
voltage at terminal 1 (with thermostat turned
on) then the thermostat if faulty - replace.
Figure 6.1.1
Microswitch
com
n.c.
Fan motor faulty
Check the supply voltage across motor termi-
nals. If there is no voltage then check the
electrical connections of 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 at motor
terminals is correct, then the motor is faulty—
replace.
6.1.4 NO HEAT / ELEMENTS NOT
WORKING (HEATING INDICATOR
ON)
Faulty contactor
With the thermostat on check that the coil of
the heating contactor is energised (voltage
between terminals A1 and A2). Check for
output voltage from the contactor (terminals 1,
3 and 5). If no output voltage (and input to
terminals 2, 4 and 6 is correct) then the
contactor is faulty - replace.
