Thermador SMW272 B Service Manual page 72

Lower Oven Section
Error
Code
Element supervisor is enabled.
F1
Over temperature detected.
F2
F3 Open temperature sensor.
Shorted sensor.
F4
Element supervisor is disabled (single
F5
/ upper oven).
The control is reading a shorted key.
F7
Possible bad connection to the touch
control board or a bad touch control
board.
Shorted meat probe (C-model ovens
F8
only).
F9
Invalid door lock switch status (single
/ upper oven).
ERROR CODE MESSAGES
Cause
Example
Bad main relay board.
Intermittent temperature
sensor or bad main relay
board.
An open circuit in the
oven sensor wiring.
A short circuit in the oven
sensor wiring.
Intermittent single/upper
oven temperature sensor
or bad main relay board.
Bad touch control board.
Bad main relay board.
Defective or jammed
single / upper oven latch
switches.
Page 70
SMW Oven Service Manual
Corrective Action
Replace main relay
board.
Replace temperature
sensor. If control still
displays F2, replace main
relay board.
Check all connections.
Check resistance of
sensor (approx. 1050
ohms at room tempera-
ture).
Check all connections.
Check resistance of
sensor (approx. 1050
ohms at room tempera-
ture).
Replace single/upper
oven temperature sen-
sor. If control still dis-
plays F5, replace main
relay board.
Check all connections
between the display
head and the touch con-
trol board. Check volt-
age across touch control
board test pads. Voltme-
ter should read 5 VDC
when a key is touched
and 0 VDC when no key
is touched.
Replace main relay
board.
Make sure single / upper
oven latch switches are
operating properly.