Rectify interference
6 720 643 196 (2010/02)
8
9. B Check sensors T3, T8 and T9.
B Compare the correct table value (ohm
measurement) with the measured
temperature from an external ther-
mometer (accurate).
Do they correspond?
yes: Æ 10
no: B Check whether the sensor is correctly positioned.
Correct if necessary. If that didn’t help, replace
the sensor.
Does the error message recur? Æ 10
10. B Manually operate the three-way valve.
Does it react?
yes: Æ 11
no: B Check the connections, Do4 and Do4(L) against
zero.
In activated mode it must be 230V against zero.
Does the error message recur? Æ 11
11. B Remove the motor. Use pliers to move
the valve stem in and out.
Does it move easily?
yes: B Reinstall the motor (manually operate it to allow
the motor to engage in the valve stem)
Æ 12
no: B Replace valve/insert.
Does the error message recur?
Æ 12
Description: Too high pressure in the cooling circuit. Automatic resetting of the pressostat, which must be
acknowledged in the display.
Check Action
Tab. 3
6 720 643 196-02.1I
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