Viessmann EHE Installation And Service Instructions For Contractors page 10

Troubleshooting
High limit safety cut-out has responded
At a temperature of 98 °C
out switches the immersion heater EHE off.
Immersion heater was not yet operational:
The high limit safety cut-out was triggered due to storage
temperatures below 12 °C. Raise the temperature at the
–
sensor to 20 °C, then reset the high limit safety cut-out:
A
Fig. 4
1. Isolate the power supply and safeguard against unau-
thorised reconnection.
2. Remove cover with screwdriver.
3. Press reset button .
A
4. Refit the cover.
10
-6 K
the high limit safety cut-
The contacts open and are locked out.
Immersion heater was operational:
The high limit safety cut-out may have been triggered
due to damage on the immersion heater. Therefore
do not reset the high limit safety cut-out. Replace en-
tire immersion heater.