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7. TROUBLESHOOTING
In the event of damage or malfunction of one of the temperature sensors, the heating output cuts
off (fail safe) and an error code is displayed.
Error Code Description
ER1 Short circuit on floor sensor
ER2 Open circuit on floor sensor / Missing floor sensor
ER3 Short circuit on room sensor
ER4 Open circuit on room sensor
ER5 Check sensing mode
The floor sensor can be replaced by a new. In the event of malfunction
of the room sensor, the entire thermostat must be replaced (Error 3 or Error 4).
Error 5 occurs if the thermostat is set in Room Sensing Mode and the floor sensor is installed.
To resolve the error change the sensing mode in Floor sensing or Room sensing with floor
temperature limiter. Otherwise, remove the floor sensor to work in room sensing mode. The floor
sensor has got the following temperature/resistance values:
Temperature Resistance
15°C 15.8 kΩ
20°C 12.5 kΩ
25°C 10.0 kΩ
30°C 8.0 kΩ
35°C 6.5 kΩ
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