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23. Warning! The battery is low.
The schedule function will be incorrect. Determined if no battery is detected or its level drops below 2 V. The battery voltage level is
monitored every 5 minutes.
24. Warning! Replace the supply air lter.
Determined if the pressure switch is triggered closing the discreet input (FILTER IN SU).
25. Alarm! Fire alarm activation.
Determined if the fire alarm sensor is triggered opening the discreet input (L3).
This alarm causes the fans to shut down immediately overriding any prior TEH blowing commands.
26. Alarm! Low supply air temperature.
Determined if the minimum supply air temperature control function is enabled (the default setpoint is +10 °С configurable within a
+5 °С to +12 °С range), and the supply air temperature remains below the control setpoint for 10 minutes with the condensing unit
disabled and the bypass closed.
27. Alarm! The return water temperature sensor is not detected.
Determined if the water heater is enabled as the main heater.
28. Alarm! Short circuit of the return water temperature sensor.
Determined if the water heater is enabled as the main heater.
29. Warning! Replace the extract air lter.
Determined if the pressure switch is triggered closing the discreet input (FILTER IN EXH).
30. Alarm! No water pressure detected.
Determined if no water pressure is detected provided that the water heater and the water pressure sensor are enabled.
31. Alarm! No water ow detected.
Determined if no water flow is detected provided that the water heater and the water flow sensor are enabled.
32. Alarm! Low return water temperature.
33. Alarm! Supply fan cannot provide heat exchanger freezing protection.
Determined if the supply fan is selected for protecting the heat exchanger from freezing and the freezing danger warning has been
active for 30 minutes.
34. Alarm! Bypass cannot provide heat exchanger freezing protection.
Determined if the bypass is selected for protecting the heat exchanger from freezing and the freezing danger warning has been active
for 30 minutes.
35. Warning! Freeze protection is deactivated this may cause freezing of the heat exchanger!
Determined if the rotary heat exchanger is not enabled and the freeze protection is deactivated.
36. Warning! The main heater is operated in the manual mode.
37. Warning! The cooler is operated in the manual mode.
38. Warning! The bypass is operated in the manual mode.
39. Warning! The rotary heat exchanger is operated in manual mode.
40. Warning! The lter timer countdown is completed. Please, replace the lter.
41. Warning! Incorrect operation of the rotary heat exchanger.
42. Warning! The preheater is operated in the manual mode.
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