Installation manual

18 Underfloor Heating
4. Troubleshooting
Normal system operating conditions:
The Power LED of the controller is lit up. All the channel LEDs are off if there is no demand for heating or cooling. The LEDs
light up when the corresponding actuators are activated. While on stand-by, waiting for the actuators to be activated, the LEDs
flash.
LED of Thermostat T-55 and Thermostat Public T-53
:
- LED blinks one time only with each transmission.
- LED blinks twice for low batteries.
- Only for Thermostat Public T-53: LED flickers if several switches are in ON position.
Failure Causes Indication Solution See
the system does not
start
no voltage power LED off in controller check that the controller is
connected to the mains and that
the wiring in the 230V
compartment is OK
cable breakdown 230V in socket but not in
230V compartment
replace cable and plug
bad radio reception
■ antenna mounted inside
metal cabinet or too close
to other shielding objects
■ building structure
unfavorable for radio
transmission
repeated radio alarms change the location of the
antenna (if the problem still is
remaining, contact your installer
for help checking the radio
transmission and test with
repeater for radio signals)