Troubleshooting - Thermador SMW 272 B Service Manual

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Lower O ven Section
• DISCO N N ECT T H E PO W ER T O T H E APPLIAN CE BEFO RE SERVICIN G.
• FO R T H O SE CH ECKS REQ U IRIN G T H E U SE O F ELECT RICAL POW ER, EX ERCISE
EX T REME CARE.
• DO N O T PERFO RM H IGH -VOLT AGE T EST S.
T H E BLOW ER MOTOR
Refer to Page 54 to access the blower motor.
1. W ith no power applied, disconnect the motor
wire connectors from their terminals.
2. Set the ohmmeter to the R x 1 scale.
3. Touch the ohmmeter leads to the motor
terminals. The meter should indicate 13
4. If the reading is not correct, remove and
replace the blower motor.
BLOWER ASSEMBLY
Motor Terminals
TROUBLESHOOTIN G
TESTIN G TH E COMPON EN TS
WARNING
TO AVOID ELECT RICAL SH OCK
Ω
T H E AIR SW IT CH
Refer to Page 52 to access the air switch.
1. W ith no power applied, remove the wire
connectors from the terminals.
2. Set the ohmmeter to the R x 1 scale.
3. Connect one of the ohmmeter leads to the
.
common (C) terminal of the switch (the ter-
minal callouts are stamped on the switch).
4. Touch the free ohmmeter lead to the N .O .
(normally-open) switch terminal. The meter
should show no continuity with the switch in
its normal position, and continuity when it is
activated.
5. If the readings are not correct, remove and
replace the switch.
Air Switch
Page 61
SMW O ven Service Manual
COM
NC
NO
NO
COM
NC