Thermador SMW 272 B Service Manual page 72

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Lower O ven Section
Error
Code
Element supervisor is enabled.
F1
F2
O ver temperature detected.
F3
O pen temperature sensor.
Shorted sensor.
F4
Element supervisor is disabled (single
F5
/ upper oven).
F7 The control is reading a shorted key.
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.
D efective or jammed
single / upper oven latch
switches.
Page 70
SMW O ven Service Manual
Corrective Action
Replace main relay
board.
Replace temperature
sensor. If control still
F2
displays , 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-
F5
plays , 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 VD C
when a key is touched
and 0 VD C when no key
is touched.
Replace main relay
board.
Make sure single / upper
oven latch switches are
operating properly.