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Fuse
For installation position, see chapter "Connection and
wiring diagram", page 61.
Battery
The battery serves to save the time and date in the
event of a power failure.
For installation position, see chapter "Connection and
wiring diagram", page 61.
High limit safety cut-out (STB)
Fig. 32
Triggering the function
If the boiler water temperature exceeds 95 °C the high
limit safety cut-out responds.
Cancelling the function
Note
The high limit safety cut-out can only be reset
(unlocked) once the boiler water temperature has
reached approx. 70 °C.
After each triggering of the high limit safety cut-out,
check that the thermally activated safety valve is reset.
1. Undo protective cap
A
.
F1
■
4A (slow)
■
Power cable KSK
■
230 V 50/60 Hz
Button cell, type CR2032, 3 V
■
Replacement: Every 5 years
■
Reset button
of the high limit safety cut-out is loca-
A
ted on the front of the boiler.
Note
The high limit safety cut-out can only be reset man-
ually.
2. Press the green button of the high limit safety cut-
out.
A quiet "click" is audible. The high limit safety cut-
out has been reset.
3. Acknowledge excess temperature at the program-
ming unit of the control unit with
4. Refit protective cap
A
Maintenance
.
d
over the green button.
55
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