Carrier AQUASNAP 30RB060-390 Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 65

Possible Causes — If this condition is encountered, check the
following items:
• Check the power supply to EXV1.
• Check the address of the EXV1 to be sure that it is
correct.
• Check the Local Equipment Network (LEN) wiring to be
sure that it is connected properly.
• Confirm unit configuration.
Co.E2 — Loss of Communication with EXV Board Number 2
Criteria for Trip — The alarm criterion is tested whether the
unit is ON or OFF, on 30RB210-300 units only.
Action to be Taken — If communication with EXV Board 2 is
lost for a period of 10 seconds, the alarm will be triggered. If
running, Circuit C will shut down normally. If Circuit C is not
running, it will not be allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• Check the power supply to EXV Board 2.
• Check the address of the EXV Board 2 to be sure that it
is correct.
• Check the Local Equipment Network (LEN) wiring to be
sure that it is connected properly.
• Confirm unit configuration.
Co.F1 — Loss of Communication with Fan Board Number 1
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. If communication with Fan Board 1 is lost for a
period of 10 seconds, the alarm will be triggered.
Action to be Taken — For 30RB060-150 and 30RB210-250,
Circuit A and B will shut down normally if they are running.
For 30RB160-190 and 30RB275-300, Circuit A will shut
down normally if it is running. If the circuit or circuits con-
trolled by the board are not running, then they will not be
allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• Check the power supply to Fan Board 1.
• Check the address of the Fan Board 1 to be sure that it is
correct.
• Check the Local Equipment Network (LEN) wiring to be
sure that it is connected properly.
• Confirm unit configuration.
Co.F2 — Loss of Communication with Fan Board Number 2
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF and on 30RB160-190, 275, and 300 only.
Action to be Taken — If communication with Fan Board 2 is
lost for a period of 10 seconds, the alarm will be triggered. If
running, Circuit B will shut down normally for 30RB160-190,
275 and 300. If Circuit B is not running for 30RB160-190, 275
and 300, then it will not be allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• Check the power supply to Fan Board 2.
• Check the address of the Fan Board 2 to be sure that it is
correct.
• Check the Local Equipment Network (LEN) wiring to be
sure that it is connected properly.
• Confirm unit configuration.
Co.F3 — Loss of Communication with Fan Board Number 3
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF, and on 30RB210-300 machines only. If
communication with Fan Board 3 is lost for a period of 10 sec-
onds, the alarm will be triggered.
Action to be Taken — If running, Circuit C will shut down nor-
mally for 30RB210-300. If the circuit is not running for
30RB210-300, then it will not be allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• Check the power supply to Fan Board 3.
• Check the address of the Fan Board 3 to be sure that it is
correct.
• Check the Local Equipment Network (LEN) wiring to be
sure that it is connected properly.
• Confirm unit configuration.
Co.O1 — Loss of Communication with Free Cooling Board
Criteria for Trip — This alarm is for a free cooling machine
only. This feature is not supported for a cooling only machine.
Action to be Taken — None
Reset Method — Automatic
Possible Causes — If this condition is encountered, confirm
unit configuration.
Co.O2 — Loss of Communication with Electrical Heaters Board
Criteria for Trip — This alarm is for a heat pump machines
only. This feature is not supported for a cooling only machine.
Action to be Taken — None
Reset Method — Automatic
Possible Causes — If this condition is encountered, confirm
unit configuration.
Co.O3 — Loss of Communication with Energy Management
Board
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF and when a function that requires the energy
management module (EMM) is configured. If communication
with the EMM is lost for a period of 10 seconds, the alarm will
be triggered.
Action to be Taken — If any function controlled by the EMM
(3-Step and 4-20 mA Demand Limit, 4-20 mA and Space
Temperature Reset, Occupancy Override, and Ice Build) is
active, that function will be terminated. If an EMM function is
programmed, and communication is lost, the function will not
be allowed to start.
Reset Method — Automatic, if communication is established,
the functions will be enabled.
Possible Causes — If this condition is encountered, check the
following items:
• Check configuration to see if the EMM is installed, (Con-

figuration UNIT
a control option that requires the EMM that may be
enabled. Correct configuration if not correct.
• Check the power supply to EMM.
• Check the address of the EMM to be sure that it is correct.
• Check the Local Equipment Network (LEN) wiring to be
sure that it is connected properly.
• Check unit configuration to be sure that no options that
require the EMM are enabled.
Co.O4 — Loss of Communication with Heat Reclaim Board
Criteria for Trip — This alarm is tested whether the unit is
ON or OFF and when the unit is configured for Heat Reclaim.
If communication with the heat reclaim board is lost for a
period of 10 seconds, the alarm will be triggered.
Action to be Taken — The unit will return to the air cooled
mode.
Reset Method — Automatic, when communication is estab-
lished, the functions will be enabled.
65

EMM). If (EMM=YES), check for