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 eliminated.

M: The fault elimination must be acknowledged manually.
RLS 1 WR: Press both arrow keys at the same time for 3 seconds.
RLS T2 WS: Acknowledge fault clearance on the display.
RLS G1 WS: Press both ventilation level buttons at the same time for 3 seconds.
Only then is the ventilation unit operable again.
A: The correction of a temperature sensor malfunction is recognised by the control. The ventilation unit then continues to operate automatically.

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 unit (touchscreen control unit)	Fault in communication with main control unit Cable break Main control unit (RLS T2 WS, RLS G1 WS) defective Wiring incorrect	A
Sensor: T-outside air upstream of EHE	Temperature sensor fault, upstream of earth heat exchanger (EHE) Cable break Temperature outside measuring range	A
Sensor: T air inlet, unit	Unit inlet temperature sensor fault Cable break Temperature outside measuring range	A
Sensor: T outgoing air	Outgoing air temperature sensor fault Cable break Temperature outside measuring range	A
Sensor: T supply air	Supply air temperature sensor fault Cable break Temperature outside measuring range	A
Sensor: T room external	External room temp. sensor fault Cable break Temperature outside measuring range	A
Sensor: T room control unit	Temperature sensor control unit fault Cable break Temperature outside measuring range Main control unit (RLS T2 WS, RLS G1 WS) 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, call in a trained specialist	A
Combi sensor (exhaust air humidity/temperature)	Humidity/temperature sensor exhaust air fault Cable break Humidity/temperature outside measuring range	A
Additional circuit board ZP1	ZP 1 communication fault Cable break ZP1 defective Incorrect DIP switch setting on ZP 1	A
Additional circuit board ZP2	ZP 2 communication fault Cable break ZP 2 defective Incorrect DIP switch setting on ZP 2	A
Bypass	Bypass fault Motor defective Foreign body blocks mechanics	M
Supply air temperature too cold	Temperature of supply air too cold Heat exchanger iced up Preheating 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 Cable break Heating module defective Temperature switch on the heat register defective	M
Zone shutter	Shutter fault Motor defective Foreign body blocks mechanics	M
External pre-heating	External pre-heating fault, external pre-heating defective	M
Pressure constancy setpoint not reached	Fault pressure constancy, setpoint is not reached	M