Check Points, Maintenance and Troubleshooting
Installation Manual
61
ENGLISH
Disturbances in the operation
In case of a malfunction during the operation of the device the display of the internal unit displays
“Caution, malfunction”.
Find the malfunction in the manual. For error correction, call the installer who performed the installa-
tion of the device.
Reset of the thermal protection of the electrical heater
The thermal protection of the electrical heater is an additional safeguard protecting the device in the
following cases:
• The electrical contactor which turns on the electrical flow heater can be permanently short-circuited.
• At commission, air is in the system; this causes heating without heat extraction.
The easiest way to determine whether the thermal protection of the electrical heater is turned off is to
turn on the operation of the auxiliary source on the control unit. Determine if you can feel by hand the
difference between the supply line and the return line. The electrical heater works if the supply line is
warmer. How to activate the auxiliary source is explained in the manual.
In case the electrical heater does not work because of one of the aforementioned reasons, the safety
has to be reset after the problem is resolved.
First you have to remove the front bottom panel.
Reset the safety thermostat by pressing the red button until you hear a “CLICK”.
Resetting the device can only be performed by installers, authorized contractors for commission or
authorized maintenance worker in a voltage-free state.
Turn off the power before proceeding maintenance
Safety thermostat
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