Koer C35-FC, Техническое руководство, Страница: 41 / 47

41
C35-FC
Symptom Diagnostic Test Cause Solution
Display brightness is low. Touch the screen to see if the
brightness will increase. If brightness increases after
the display has been touched,
the Dim display setting is
turned on. Change “Dim” display settings
in Display menu. See chapter
11.4. Display.
If brightness don’t increases
after the display has been
touched, the Night mode
setting is turned on. Change the “Night mode” start
and stop time, or turn off this
option in the display menu.
See chapter
11.4. Display.
Scheduler is not working
properly. Set new timers and test the
scheduler. The home screen
should respond in line with
the set timetable. Time and/or Date have not
been set correctly. Enter the correct date and
time in the
Date/Time menu.
See chapter 11.5. Date and
time settings.
When device is following
scheduler it is always in
standby mode. The scheduler timer presets
have not been confi gured. Enter new timers in
scheduler presets in the
Scheduler menu. See chapter
11.2. Scheduler
System is not heating or
cooling to the desired
setpoint. Check the Home Screen
status bar to ensure the
correct control sequence icon:
(heating) or (cooling),
is present.
The unit is set to manual
changeover and is in the
incorrect control mode. Enter the Menu and press
the (heating) or
(cooling) button for manual
changeover.
Manual changeover can’t be
performed from the settings
menu. Check if the (heating)
or (cooling) button is
unavailable (dimmed button). Manual changeover is
disabled. Manual changeover
is only possible when
Control
sequence is set to “ Heating
or Cooling” and if Sensor
function in
In/Out menu is
not set to “Changeover”.
Change the Sensor function
in In/Out menu or Control
sequence in Advanced
Parameters.
Sensor function in In/Out
menu can’t be changed. Check if the message on the
button is
“Not connected”.
If the PT1000 sensor is not
connected to RTD terminals
or if the resistance of
connected element is less
than 803 Ω and more than
1480 Ω, then the
Sensor
function parameter will be
unavailable.
Connect the correct RTD
sensor (PT1000) to RTD
terminals.
Setpoint buttons are not
shown on the
Home screen.
Check if the device is in
Economy or Standby mode by
reading the status on screen. Setpoints in these modes
can only be adjusted in the
Setpoints menu. Change the
Operating mode
with button or bypass to
Comfort mode by activating
Occupied mode function with
button.
System is not heating or
cooling and only the Menu
button is shown on the
Home screen. Check if “Window is open”
message is shown on the
display and if any window in
the room is open.
The device has detected that
a window is open . Device will exit bypass mode
when the window is closed.
“Window is open” message is
shown on the display and all
windows are closed.
Close or open the window to
see if the device will change
operating mode. Polarity of the window
contact is not correct. Change the
Window contact
polarity in
In/Out menu.