30
EB 2185 EN
Operation
6.3 Sensor failure
Indication of a defective sensor
When the sensor is defective (e.g. a leak in
the sensor system), a red cam becomes visi-
ble in the opening (16) and the valve is
locked. The valve cannot be unlocked when
the sensor system is defective. The device
must be replaced.
6.2
Unlocking after a fault
A red cam visible in the opening (16 in
Fig. 2) indicates that the valve is locked.
After the fault has been remedied, a screw-
driver is required to unlock the safety tem-
perature limiter (Fig. 5).
Place the screwdriver through the opening
onto the cam and lever the cam to unlock it.
A clicking noise can be heard and the red
cam disappears.
Note:
The valve can only be unlocked after
the limit temperature has fallen below
the adjusted limit value by at least
15 K.
Opening
Screwdriver
Red cam
Fig. 5:
Unlocking
Summary of Contents for 2439
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