Fault messages
The tables below show potential faults and their causes. Column 3, Ackn., indicates whether or not the fault must be acknowledged after it has been cleared.
M: The fault elimination must be acknowledged manually. Only then is the ventilation unit operable again.
A: The correction of a temperature sensor malfunction is recognised by the control. The ventilation unit continues to operate automatically after removal.
Collective alarm: A collective alarm is also issued with every fault message. The collective alarm can be used via the potential-free switching contact on the main board and, in case of malfunction, switch on a signal lamp, for example.
Fault/failure of | Message/Possible cause | Ackn. |
|---|---|---|
Supply air fan | Supply air fan fault Cable break, fan defective | M |
Exhaust air fan | Exhaust air fan fault Cable break, fan defective | M |
Communication with main control panel (touchscreen control unit) | Fault in communication with main control unit Break in a cable; main control unit defective; wiring incorrect | A |
Sensor: T-outside air upstream of EHE | Temperature sensor fault, upstream of EHE Break in a cable; temperature outside measuring range | A |
Sensor: T air inlet, unit | Unit inlet temperature sensor fault Break in a cable; temperature outside measuring range | A |
Sensor: T outgoing air | Outgoing air temperature sensor fault Break in a cable; temperature outside measuring range | A |
Sensor: T supply air | Supply air temperature sensor fault Break in a cable; temperature outside measuring range | A |
Sensor: T-room external | External room temp. sensor fault Break in a cable; temperature outside measuring range | A |
Sensor: T-room control unit | Temperature sensor BDE fault Break in a cable; temperature outside measuring range; main control unit defective | A |
Sensor: T-room bus | Temperature sensor KNX fault No data telegram for room temperature in the last 15 minutes | A |
System memory | System memory fault Checksum error of stored parameter; load commissioning data | M |
System bus | System bus fault Internal error; contact trained specialist | A |
Combi sensor (exhaust air humidity/temperature) | Humidity/temperature sensor exhaust air fault Break in a cable; humidity/temperature outside measuring range | A |
Supply air temperature too cold | Temperature of supply air too cold Heat exchanger iced over, PTC heat register defective | A |
Exhaust air temperature too cold | Temperature of exhaust air too cold Exhaust air in unit too cold, apartment cooled | A |
Frost protection | Frost protection fault Break in a cable, heating module defective, temperature switch on heat register defective | M |
External pre-heating | External pre-heating fault External preheating defective | M |