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Status display
No display:
1638Z05
No power at the heating controller
Faulty connection between room unit and heating
controller
Room unit and heating controller not compatible
Room unit faulty
Display:
1638Z06
Programming lock active
Heating controller’s operating mode is not set to man-
ual operation
Display:
1638Z07
No sensor connected or sensor faulty
Display:
1638Z08
Remote telephone switch (external contact) active
Display flashes:
1638Z09
Room unit is in the initialization phase (rotating circle)
4 Operation by the heating engineer
The QAA70 room unit has a service and parameter setting level to give the heating
engineer additional setting choices. This level can only be activated by pressing a cer-
tain combination of buttons.
4.1 Activating the service and parameter setting
level
Keep buttons and depressed for at least 5 seconds. This will activate the ser-
vice and parameter setting level.
Then, press the same arrow buttons to select the individual entry line and adjust the
values by pressing
or .
4.2 Settings
Device address for the
PPS interface
This line is used for setting the PPS address (for QAA70 room units connected
to RVA... controllers, default address 1 should not be changed)
The display shows the status of the PPS:
Colon flashing at one-second intervals: communication o.k.
Steady or missing colon: ready to communicate
Steady hyphens: communication interrupted
Device identification
The display shows the identification number and the software-version.
14/20
Siemens Building Technologies Room Unit QAA70 CE1P1638E
Landis & Staefa Division Operation by the heating engineer 17.04.2000
14


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