Viessmann CVE, Service Instructions Manual

Page: 12 / 20

12
A B
Fig. 7
1. Disconnect the power supply and safeguard
against unauthorised reconnection.
2. Remove cap
A
, taking care with heating indicator
light
B
.
3. Remove heating indicator light
B
from the cap for
safekeeping.
Resetting the high limit safety cut-out
The high limit safety cut-out switches the immersion
heater off at a sensor temperature of 100 °C.
A
B
B
Fig. 8
1. Remove cap
A
(see page 12).
The resetting feature B is red when locked.
2. Press resetting feature B with a screwdriver.
The resetting feature
B
turns black when
unlocked.
3. Refit cap
A
along with the heating indicator light.
4. Switch the power on again.
Note
If the high limit safety cut-out locks several times in a
row, the TR/HLSC (temperature controller/high limit
safety cut-out) combination device must be replaced.
Replacing the TR/HLSC combination device
A
C B B
D
Fig. 9
1. Remove cap A (see page 12).
2. Disconnect cables
B
from TR/HLSC combination
device
C
.
3. Remove 2 screws
D
from the retainer.
4. Fit new TR/HLSC combination device
C
.
Commissioning, inspection, maintenance
Removing the cap from the immersion heater
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