GB - 6
NTC Room Controller 2
Symptom Possible Cause Things to check Solution
No LCD display
1) mis-wiring of the 12 volt power to
Room Controller 2 control.
1) Verify that +12V and Ground are
connected to the proper terrminals of
the Controller. Reference Installation
wiring section for correct connections
After disconnecting the power, correct
the wiring problem and re-cycle power.
2) Power not online
1) Check that the units main power is
connected. The main control board
should be operating normally
After vering the wiring to the Room
Controller 2, re-cycle the unit power.
3) No 12 volts between P and G of
terminal block.
1) Check the installation of the J6 plug on
the main control board.
After disconnecting the power, correct
the wiring problem and re-cycle power.
+12 volts applied to Room Controller at
the correct terminals and still does not
operate
1) The Room Controller 2 is damaged. Change the Room Controller 2 and re-
cycle power.
The data sent by the indoor unit are not
displayed.
1) The connecting cable between the unit
to the Room Controller2 is cut or not
properly connected.
1) Check connection to J2 on the unit
and on CRC2“I”connector.
After disconnecting the power, correct
the wiring problem and re-cycle power.
Icon A is displayed. There is no active
button.
1) Interference from another interface on
the CRC2 communication line. 1) Check that the LED card is connected.
Disconnect the LED card.
For Cassette units this should be made by
disconnecting the black connector under
the grille lter.
Room Controller 2 conguration, troubleshooting
Conguration table for NTC units
Troubleshooting
Item Value Description Displayed
1- °C
°F
Temperatures displayed in degrees C
Temperatures displayed in degrees F NO
2- Co
St
System - CRC2 will be used with a communicating system
Stand alone system - The CRC2 will be used with a non-communicating system NO
3-
0 Temperature displaying
No temperature is displayed
YES
1The ambient temperature will be displayed
2 The set-point temperature will be displayed
(In non-communicating systems the temperature range goes from 15 to 32 °C; from 59 to
90 °F)
(In non-communicating systems with Reset step 1°, the temperature range goes from 18
to 26°C; from 68 to 76 °F)
(In communicating systems with Reset step 2°, the temperature range goes from 16 to 30
°C ; from 64 to 80 °F)
4-
Reset Step Value
This represent the value of the single segment of the bar graph
NO
0=0°C or 0°F One segment = 0° (C and F)
(In communicating systems with Reset step 0°, temperature is xed at 22 °C, 72 °F)
1=0,5°C or 0,9°F
One segment = 1 °C or 0.9 °F
(In communicating systems with Reset step 0.5°, temperature
2=1°C or 1,8°F
One segment = 1 °C or 1,8 °F
(In communicating systems with Reset step 1°, temperature range goes from 18 to 26 °C;
from 68 to 76 °F)
3=2°C or 3,6°F
One segment = 2 °C or 3,6 °F
(In communicating systems with Reset step 2°, temperature range goes from 16 to 30 °C;
from 64 to 80 °F
5-
Indoor fan icon displaying YES: Should the unit be
provided with variable speed
indoor motor, two speeds
are available: HIGH and
AUTO
0 The icon of the 3-speed indoor fan will not be displayed
1The icon of the 3-speed indoor fan will be displayed
2 The variable speed indoor motor icon will be displayed
6-
Louver icon displaying
YES0 The louver icon will not be displayed
1The louver icon will be displayed
