SLOWTOP
YES
NO
NO
Replace the power
board
NO
NO
YES
Replace the back
cooling fan
YES
NO
YES
YES
WM02 power board
over heating warning
Does the
back cooling
fan run?
Replace the
power board
Test the
back cooling fan
measuring the
power
supply
on the connector
of the cooling fan, with the
multimeter set to V AC.
Does the back cooling
fan
receive the
230 V AC
power supply?
Check the
direction of
t
he air flow
Is it from
the inside
to the outside
of the unit?
Reverse the back
cooling fan
inside its
case
Move the oven far
away from the external
heating source
Is the
oven near an
external heating
source?
Measure the temperature
at
the back side of the oven
near
the power board
(with the back panel closed)
with an external certified
probe
Is the
temperature
over
70 °C
(158 °F)?
Test the oven and
investigate the possible
causes of overheating
such as oven installation,
external heating sources
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