5
Maintenance
RT20 RF Room Thermostat – 6721844608 (2022/03)
9
Fig. 9
Temperature setting
Low battery reminder
The average battery life is about 12 months in normal use.
The LCD will display the letters LO when the battery level is low
and the thermostat will send a command to stop the heating.
The heating will turn ON again and work at the set temperature
after the batteries are replaced.
Receiver - indicator button signals
Table 5
Receiver indicator button signals
5
Maintenance
▶ Check the appliance regularly for faults.
▶ Keep the appliance and the installation location clean.
6
Troubleshooting
Thermostat and receiver communication error
After the communication connection has been disconnected
for 350 seconds, the red LED of the receiver will flash fast and
slowly alternately.
The cause of the failure may be the distance between the
thermostat and the receiver, wireless frequency conflicts or low
batteries in the thermostat.
•
When the receiver is reconnected to the thermostat, the
receiver will automatically switch to the normal working
mode.
•
When the communication is disconnected, the receiver will
automatically turn OFF the heating in the boiler. This
function effectively avoids energy waste and safety issues
when the communication is disconnected in winter mode.
•
When the communication between the receiver and the
thermostat is disconnected, the heating can be turned ON
manually in the button on the receiver. The green LED will
flash fast and slowly alternately. Once the wireless
communication is reconnected, the receiver will work
according to settings of the thermostat.
•
If the receiver is installed too far from the thermostat, the
wireless communication may be weakened. After the
communication is disconnected for a period of time, it can
be restored to the normal working mode.
•
When the power supply of the receiver is insufficient, the
communication connection will fail. The receiver will be in
standard working mode after the power supply is
recovered, and it will work according o settings of the
thermostat. It is not necessary to perform any operation to
the thermostat or the receiver, unless the location of the
thermostat is changed.
Thermostat real-time temperature deviation
If deviation between thermostat real-time temperature and
actual temperature exceeds 1.5℃, the thermostat needs to be
calibrated.
For consulting the calibration method, check parameter P03.
Indicator signals Meanings
Green LED stays
on
Heating is turned ON. (the user can be
turned ON manually or by the thermostat).
Red LED stays
on
Heating is turned OFF
(the user can be turned OFF manually or
by the thermostat).
Green LED
flashes regularly
The thermostat is being paired
(by pressing and holding the indicator
button for 5 seconds).
Red LED flashes
fast and slowly
alternately
Fail to communicate with the thermostat.
The heating is automatically turned OFF
(refer to the troubleshooting for details).
Green LED
flashes fast and
slowly
alternately
Fail to communicate with the thermostat.
The heating is manually turned ON (when
the communication cannot be re-establish
and the heating is turned ON manually).
0010042937-001
+
_
35ºC
3ºC
