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6 - DIAGNOSTICS - TROUBLESHOOTING
6.1 - General
The PRO-DIALOG Plus 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
5
Room temperature sensor
failure 1
6
Room temperature sensor
failure 2
7
Setpoint offset fault - sensor T56
8
Supply temperature sensor
failure
9
Outdoor temperature sensor
failure
10
Heat exchanger water
temperature sensor failure
11
IAQ sensor failure
12
Relative humidity sensor failure
14
Defrost sensor fault, circuit A
15
Defrost sensor fault, circuit B
16
Discharge pressure transducer
failure, Circuit A
17
Discharge pressure transducer
failure, Circuit B
18
Suction pressure transducer
failure, Circuit A
19
Suction pressure transducer
failure, Circuit B
22
Loss of communication with
slave board
23
Loss of communication with
AUX-1 board
28
ALARM DESCRIPTION
Thermistor outside range
As above
The offset value is outside the admissible
range.
Thermistor outside range
As above
As above
Sensor outside range
As above
As above
As above
Voltage delivered by the sensor is
incorrect
As above
As above
As above
Communication has been lost with the
slave board (circuit B control)
Communication has been lost with the
AUX-1 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
Unit shut down
Automatic, if temp. measured by sensor
returns to permitted range of values
The faulty sensor is not
As above
used in the room
temperature calculation.
Automatic if the offset value returns to
The offset value for sensor
T56 is set to 0.
the range of admissible values.
As above
Unit shut down
As above
As above
As above
As above
Indoor air quality function
Automatic if the voltage delivered by the
sensor returns to normal
disabled
Relative humidity function
As above
disabled
Circuit shut down, if unit is
As above
in heating mode
As above
As above
Automatic if the voltage delivered by the
Circuit A shut down
sensor returns to normal
As above
Circuit B shut down
As above
Circuit A shut down
As above
Circuit B shut down
Circuit B shut down
Automatic if communication is re-
established
If unit is fitted with varia-
As above
ble-speed fan, unit shut
down, ortherwise none
ITEM NUMBER
ITEM VALUE
2-DIGIT DISPLAY 4-DIGIT DISPLAY BUTTON LED
0
0
2 ALArM
0
rESEt ALArM
0
Good
then, 2 ALArM
then, no ALArM
PROBABLE CAUSE
Faulty thermistor
As above
Offset cursor fault, wiring error or
disconnection.
Faulty thermistor
As above
As above
Defective sensor
As above
As above
As above
Defective transducer, wiring fault
As above
As above
As above
Bus wiring fault, wrong software in slave
board or defective slave board
Bus wiring fault or defective slave board
PRESS
MENU
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