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ACTIVE FAULTS
Displays the list of active faults in order of occurrence.
ACTIVE ALERTS
Displays the list of active alerts in order of occurrence.
HISTORY
Displays the list of active and previously active faults and
alerts in order of occurrence with time and date.
RESET FAULTS/ALERTS
User command to manually reset faults and alerts.
Each alarm can have up to 3 data points stamped along with
date and time to assist in troubleshooting. Pressing ENTER on
the alarm or expanded screen will provide these data points.
DIAGNOSTIC ALARM CODES AND POSSIBLE CAUSES
Fault F010 – MBB LOW VOLTAGE
This fault occurs when the MBB supply voltages falls below
17 volts AC. When this occurs, the control will shut down the
unit. This will automatically clear when the supply voltage ris-
es above 19 volts AC. The cause of this fault is usually a
brownout condition, low supply voltage, or supply power miss-
ing a phase.
Fault F011 – MBB REFERENCE VOLTAGE
This fault occurs when the MBB internal microprocessor’s DC
reference voltages is out of range.When this occurs, the control
will shut down the unit. This will automatically clear when the
DC reference voltage goes back in range. The cause of this
fault is usually a MBB failure or supply voltage out of range.
Alert A012 – MBB ZERO CROSSING
This fault occurs when the MBB supply voltage frequency is
out of range. When this occurs, the control will issue an alert.
This will automatically clear when the supply voltage goes
back in range. The cause of this fault is usually a MBB failure
or supply voltage frequency to high or to low.
Fault F013 – MBB FUSE 2 OPEN
This fault occurs when the MBB’s internal fuse number 2 ex-
ceeds threshold temperature. When this occurs, the control will
shut down the unit. This will automatically clear when the fuse
temperature gets back in range. The cause of this fault is usual-
ly a switch input has a wiring error (short) or the switch pulled
too much current. Discrete input number 2, Fire Shutdown in-
put, and the IGC fan request are connected to fuse 2.
Fault F014 – MBB FUSE 3 OPEN
This fault occurs when the MBB’s internal fuse number 3 ex-
ceeds threshold temperature. When this occurs, the control will
shut down the unit. This will automatically clear when the fuse
temperature gets back in range. The cause of this fault is usual-
ly a switch input has a wiring error (short) or the switch pulled
too much current. Configurable discrete input numbers 12, 13,
and 14 are connected to fuse 3.
Alert A015 – MBB RNET VOLTAGE RANGE
This fault occurs when the MBB’s Rnet 12 volt output is out of
range. When this occurs, the control will issue an alert, and any
accessory connected to the Rnet plug may not operate properly.
This will automatically clear when the voltage goes back in
range. The cause of this fault is usually a MBB failure or sup-
ply voltage out of range.
Alert A016 – MBB 24VDC RANGE
This fault occurs when the MBB’s 24vdc output falls below
17 volts DC. When this occurs, the control will put the Analog
Input number’s 6, 7, and 8 into error state. This will automati-
cally clear when the voltage rises above 19 volts DC. The
cause of this fault is usually a MBB failure or supply voltage
out of range.
Alert A017 – MBB 5VDC RANGE
This fault occurs when the MBB’s 5vdc output falls below
4.5 volts DC. When this occurs, the control will put the Trans-
ducer inputs into error state. This will automatically clear when
the voltage rises above 4.5 volts DC. The cause of this fault is
usually a MBB failure or supply voltage out of range.
Fault F018 – MBB EEPROM FAILURE
The unit will completely shut down. The serial EEPROM chip
on the MBB which stores the unit’s configuration is not re-
sponding. Recovery is automatic but MBB board replacement
may be necessary. Cycling the power to the control should be
tried before board replacement.
Alert A019 – MBB CLOCK FAILURE
The alert occurs when the RTC clock chip on the MBB is not re-
sponding. Time and date functions, such as local occupancy
schedules, will not operate. The unit will default to 24/7 unoccu-
pied mode. Recovery is automatic but MBB board replacement
may be necessary. Cycling power to the control and reconfigur-
ing the time and date should be tried before board replacement.
Fault F020 – SOFTWARE ERROR
The unit will completely shut down. The software on the MBB is
not responding. Recovery is automatic if the software is able to re-
set the board but software change may be necessary. Cycling the
power to the control should be tried before board replacement.
Alert A099 - COMM LOSS WITH SIOB
This alert occurs when there has been a loss of communication
with the IO Board on the LEN bus. Any sensor inputs from the
board will be ignored and outputs will no longer be controlled.
Alert A100 – SAT SENSOR FAILURE
This alert occurs when the fan supply temperature sensor is in
an error state. Economizer cooling cannot occur while this alert
is active. The unit will not be able to honor SAT limits. This
alert resets automatically. The cause of the alert is usually a
faulty thermistor, a shorted or open thermistor caused by a wir-
ing error, or a loose connection.
Alert A101 – FST SENSOR RANGE
This alert occurs when the fan supply temperature sensor is
outside the range –40°F to 245°F (–40°C to 116°C). This alert
resets automatically. The cause of the alert is usually a faulty
thermistor, a shorted or open thermistor caused by a wiring er-
ror, or a loose connection.
Alert A102 – FST OPEN SENSOR
This alert occurs when the fan supply temperature sensor reads
as an open circuit. This alert resets automatically. The cause of
the alert is usually a faulty thermistor or an open thermistor
caused by a wiring error, or a loose connection.
Alert A103 – FST SHORTED SENSOR
This alert occurs when the fan supply temperature sensor reads
as a short circuit. This alert resets automatically. The cause of
the alert is usually a faulty thermistor or a shorted thermistor
caused by a wiring error, or a loose connection.
Alert A104 – OAT SENSOR RANGE
This alert occurs when the outdoor air temperature is outside
the range –40°F to 245°F (–40°C to 116°C). All ambient tem-
perature lockout limits for cooling and heating are ignored. All
cooling control logic will assume OAT is high. For economizer
equipped units, the economizer will not operate to provide
cooling. The economizer will still operate for ventilation. The
control will use normal operation for outdoor fan control. For
units with CCH crankcase heat relay control, the crankcase
heat relay will be turned on if any compressor is off. This alert
resets automatically. The cause of the alert is usually a faulty
thermistor, a shorted or open thermistor caused by a wiring er-
ror, or a loose connection.
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