Diagnostics - Troubleshooting; General; Displaying Alarms; Resetting Alarms - Carrier AQUASNAP 30RA/RH Operation & Maintenance Instructions Manual

6 - DIAGNOSTICS - TROUBLESHOOTING

6.1 - General

The PRO-DIALOG control system has many fault tracing aid
functions. The local interface and its various menus give access
to all unit operating conditions. The test function makes it
possible to run a quick test of all devices on the unit. If an
operating fault is detected, an alarm is activated and an alarm
code is stored in the Alarm menu.

6.2 - Displaying alarms

The alarm LEDs on the summary interface (see section 4.1)
give a quick display of the status of each circuit and the unit as
a whole.
- A flashing LED shows that the circuit is operating but
there is an alarm.
- A steady LED shows that the circuit has been shut down
due to a fault.
The Alarm menu on the main interface displays up to 5 fault
codes that are active on the unit.

6.3 - Resetting alarms

When the cause of the alarm has been corrected the alarm can
be reset, depending on the type, either automatically on return
to normal, or manually when action has been taken on the unit.
Alarms can be reset even if the unit is running.

6.4 - Alarm codes

The following list gives a complete description of each alarm code and its possible cause.
ALARM CODE DESCRIPTIONS
ALARM NAME
ALARM
CODE
1 Compressor A1 failure
2 Compressor A2 failure
3 Compressor A3 failure
5 Compressor B1 failure
6 Compressor B2 failure
7 Compressor B3 failure
9 Heat exchanger leaving fluid
thermistor failure
10 Heat exchanger entering fluid
thermistor failure
11 CHWS fluid thermistor failure
(master/slave)
12 Defrost sensor fault, circuit A
13 Defrost sensor fault, circuit B
14 OAT sensor failure
15 Discharge pressure transducer
failure, Circuit A
16 Discharge pressure transducer
failure, Circuit B
17 Suction pressure transducer
failure, Circuit A
18 Suction pressure transducer
failure, Circuit B
21 CCN/clock board failure
22 Loss of communication with
slave board
23 Loss of communication with
compressor slave board
24 Loss of communication with PD-
4 x DO slave board
ALARM DESCRIPTION
Motor safety input has opened due to
compressor overtemperature protection.
As above
As above
As above
As above
As above
Thermistor outside range
As above
As above
As above
As above
As above
Voltage delivered by the sensor is incorrect
Value read by the sensor is outside range
Voltage delivered by the sensor is incorrect
Value read by the sensor is outside range
The clock board is no longer detected
Communication has been lost with the slave
board (circuit B control)
Communication has been lost with the
compressor A3 + B3 control board
Communication has been lost with the
electric heating stage control board
This means that an alarm can be reset without stopping the
machine. In the event of a power supply interrupt, the unit
restarts automatically without the need for an external com-
mand. However, any faults active when the supply is inter-
rupted are saved and may in certain cases prevent a circuit or a
unit from restarting.
A manual reset must be run from the main interface using the
following procedure:
RESET OF ACTIVE ALARMS
OPERATION
Hold down the MENU
button until the LED for
alarms lights. The 4-
digit display shows the
number of active
alarms (2 in this
example).
Press the Enter button
until "rESEt ALARrM" is
shown in the 4-digit
display.
Press the Enter button
again to validate the
reset. "Good" is
displayed for 2 seconds
then, "2 ALArM" and
then, "no ALArM".
ACTION TAKEN BY RESET TYPE
THE CONTROL
Compressor is shut Manual
down
As above As above
As above As above
As above As above
As above As above
As above As above
Unit shut down Automatic, if temp. measured by sensor
returns to permitted range of values
As above As above
As above As above
Circuit shut down, if unit As above
is in heating mode
As above As above
As above As above
Circuit A shut down Automatic if the voltage delivered by the
sensor returns to normal
Circuit B shut down As above
Circuit A shut down As above
Circuit B shut down As above
Unit shut down Automatic if board is detected again
Circuit B shut down Automatic if communication is re-
established
Compressors A3 + B3 As above
shut down
Electric heating stages As above
shut down
ITEM NUMBER ITEM VALUE
2-DIGIT DISPLAY 4-DIGIT DISPLAY BUTTON LED
0
0 2 ALArM
0 rESEt ALArM
0 Good
then, 2 AL
then, no ALArM
PROBABLE CAUSE
Compressor overheat
As above
As above
As above
As above
As above
Faulty thermistor, wiring error or
disconnection
As above
As above
As above
As above
As above
Defective transducer, wiring fault
As above
As above
As above
Defective CCN/clock board
Bus wiring fault, wrong software in slave
board or defective slave board
As above
As above
PRESS MENU
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