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Static error messages
Dynamic error mes-
sages
Room temperature
Address switch
Note
Disposal
CA2N3851en_02 / 12.01.2007
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Temperature setpoint
• Temperature setpoint in °C or °F (see "Function key 2")
The displayed temperature setpoint comes from the room unit.
Display
Description
The address of the service terminal has not been set correctly (see
"Hex switch").
Dynamic error messages are displayed for 5 s when they occur. The error message
remains in memory while the error persists. The message can be re-displayed for 5 s
using Function key 1. If there is more than one error, the error with the highest priority
will be displayed. The table below shows the error messages in order of priority.
Display
Description
There has not yet been any communication between the room unit and
the controller (e.g. during the controller power-up phase)
The controller does not recognise the room unit type.
C: Communication between controller and room unit is interrupted.
02: Firmware version of the service terminal (e.g. Version 2.0)
Error (open circuit or short circuit) affecting the potentiometer or tem-
perature sensor of the connected room unit.
Display
Description
Room temperature in °C or °F (see "Function key 2")
The displayed room temperature is the temperature measured by the
room unit; there is no temperature sensor in the service terminal itself.
The service terminal must have the same PPS2 address as the room unit (address
1 ... 12) in order to display any of the information described above. The QAX3... room
units are all factory-set to Address 1. The service terminal is also factory-set to Ad-
dress 1.
The address can be changed if necessary:
– Service terminal: hex switch on the back of the housing; remove base plate for access
– Room unit: Address plugs.
If an invalid address is set (e.g. "0"), the error message "E16" will be displayed.
If the address of the service terminal and the room unit are not the same, or if several
devices are communicating, the "normal operation" display will show 12 extra points
(one for each possible address). The points that stand for actively communicating de-
vices are flashing.
The
includes electrical and electronic components and must not be disposed
device
of as domestic waste.
Current local legislation must be observed.
RXT20.1 – Service terminal
Building Technologies
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