64
Flashing output LED (red):
The appropriate output channel LED can flash, indicating that the Room Sensor or Controller on that channel has a fault/error. The failure code
can also be seen in the service menu (submenu 2a).
Flashes Description Corrective action
1 Flash The Master Controller has lost communication to the Room Sensor. The fault is corrected by re-establishing the connection to the Room Sensor and
the fault condition will be automatically reset once correct communication is
resumed. If the Room Sensor is defective and has to be changed, or if it has been
deliberately removed, it is necessary to make a HARD RESET.
If the Room Sensor is of the WIRELESS type, the error/fault message
could be an indication that the power has failed, and that the internal
battery of the Room Sensor needs to be replaced.
2 Flashes The internal sensor in the CT2 Programmable Room Sensor/Controller is
defective.
The fault can only be corrected by replacing the Room Sensor/Controller.
Remember to make a HARD RESET after installing the new Room Sensor/
Controller.
3 Flashes The limit sensor on the CT2 Programmable Room Sensor/Controller is defective. Replace the faulty sensor. Reset is NOT required.
4 Flashes Defective REHAU CT2 Programmable Room Sensors/Controllers. If a CT2 Programmable Room Controller operating a group of Room Sensors
becomes defective, the remaining Room Sensors will continue control within the
maximum and minimum limits programmed into the Master Controller.
5 Flashes Two or more CT2 Programmable Room Sensors/Controllers are trying to control
this output.
Check “AREA” setting on the CT2 Programmable Room Sensor.
13.3 Voltage Measurements
The following information should be useful to electrical installers who, with a multi meter, can measure voltages on the terminals of the Master
Controller Modules and Room Sensors. Please check these measurements first, in the event of an apparent malfunction.
Voltage measured across Value Description
Sensor Bus (measured at any point within the Bus) 4.69v to 4.99v dc Indicates a good bus
Less than 4.69v dc Indicates that one sensor may have polarity reversed
Above 4.99v Theoretically impossible
External switch (measured across the terminals) 11.5 to 12v dc
Good Functionality
Supply water sensor (measured across two terminals) 5.0v dc
Mixing valve actuator 25v to 27v ac between + and -
Drive signal (the master shows the output in the “spanner”
section of the display menu, this can be checked at the
actuator terminals, across the blue and black cables).
0v to 10v dc
TROUBLESHOOTING AND ERROR/FAULT MESSAGES
ERROR/FAULT MESSAGES
13.0
13.2
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