Carrier 30RA Alarm Codes, Troubleshooting, and Reset Procedures

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

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	ITEM NUMBER	ITEM VALUE	PRESS MENU
	2-DIGIT DISPLAY 4-DIGIT DISPLAY BUTTON LED
Hold down the MENU
button until the LED for
alarms lights. The 4-	0
digit display shows the
number of active
alarms (2 in this	0	2 ALArM
example).
Press the Enter button	0	rESEt ALArM
until "rESEt ALARrM" is
shown in the 4-digit
display.
Press the Enter button	0	Good
again to validate the		then, 2 AL
reset. "Good" is		then, no ALArM
displayed for 2 seconds
then, "2 ALArM" and
then, "no ALArM".

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	ALARM NAME	ALARM DESCRIPTION	ACTION TAKEN BY	RESET TYPE	PROBABLE CAUSE
CODE			THE CONTROL
1	Compressor A1 failure	Motor safety input has opened due to	Compressor is shut	Manual	Compressor overheat
		compressor overtemperature protection.	down
2	Compressor A2 failure	As above	As above	As above	As above
3	Compressor A3 failure	As above	As above	As above	As above
5	Compressor B1 failure	As above	As above	As above	As above
6	Compressor B2 failure	As above	As above	As above	As above
7	Compressor B3 failure	As above	As above	As above	As above
9	Heat exchanger leaving fluid	Thermistor outside range	Unit shut down	Automatic, if temp. measured by sensor	Faulty thermistor, wiring error or
	thermistor failure			returns to permitted range of values	disconnection
10	Heat exchanger entering fluid	As above	As above	As above	As above
	thermistor failure
11	CHWS fluid thermistor failure	As above	As above	As above	As above
	(master/slave)
12	Defrost sensor fault, circuit A	As above	Circuit shut down, if unit	As above	As above
			is in heating mode
13	Defrost sensor fault, circuit B	As above	As above	As above	As above
14	OAT sensor failure	As above	As above	As above	As above
15	Discharge pressure transducer	Voltage delivered by the sensor is incorrect	Circuit A shut down	Automatic if the voltage delivered by the	Defective transducer, wiring fault
	failure, Circuit A			sensor returns to normal
16	Discharge pressure transducer	Value read by the sensor is outside range	Circuit B shut down	As above	As above
	failure, Circuit B
17	Suction pressure transducer	Voltage delivered by the sensor is incorrect	Circuit A shut down	As above	As above
	failure, Circuit A
18	Suction pressure transducer	Value read by the sensor is outside range	Circuit B shut down	As above	As above
	failure, Circuit B
21	CCN/clock board failure	The clock board is no longer detected	Unit shut down	Automatic if board is detected again	Defective CCN/clock board
22	Loss of communication with	Communication has been lost with the slave	Circuit B shut down	Automatic if communication is re-	Bus wiring fault, wrong software in slave
	slave board	board (circuit B control)		established	board or defective slave board
23	Loss of communication with	Communication has been lost with the	Compressors A3 + B3	As above	As above
	compressor slave board	compressor A3 + B3 control board	shut down
24	Loss of communication with PD-	Communication has been lost with the	Electric heating stages	As above	As above
	4 x DO slave board	electric heating stage control board	shut down

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