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Service Manual STG5/7 intelligent STW5/7 intelligent form 9123999 rev. 05/2010
TROUBLESHOOTING
Description of part Symptoms
Possible causes
Solving: checking/action
Capacitor
Drive motor or blower
does not work
Wiring.
Check the wiring.
Capacitor malfunction.
Check function after connecting a
new capacitor.
Checking of the capacitor:
Discharge capacitor with a
screwdriver. Set meter on MΩ and
connect the pins of the meter
to the contacts, value goes up.
Change the pins on the contacts,
value goes up again. This means
the capacitor is OK.
Blower
Blower does not run
Wiring.
Check the wiring.
Check the power on the blower.
Coil malfunction.
Check the resistance of the coils.
Between blue and brown wire:
310Ω.
Between blue and black wire:
320Ω.
Between brown and blakc wire:
630Ω.
Blower runs after start-
ing it up by hand
Capacitor malfunction.
Check capacitor (see capacitor), or
connect new capacitor.
Blower stops during
process and comes in
again after a period of
time
Coil overheated, thermis-
tor switches off (150°C
- 302°F)
Check cooling circuit of blower.
Check if warmer is close to another
heat source.
Measure temperature during
process.
Fuse burned
Short circuit in coil to
earth
Check insulation value of coil with
a Megger on 500V. Minimum value
is 0.5MΩ.