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Alert Codes T143 and T144 -- Circuit Failure to Pressurize
Alert codes T143 and T144 are for circuits A and B respectively.
These alerts have “Service Test” text that will be displayed if the
alert occurred during service test. These alerts occur when the
compressor turns on and the suction pressure does not drop at least
10 PSIG in the first 20 seconds. If the OAT is less than 40_F
(4.4_C) the suction only has to drop 5 PSIG. This alert causes a
strike for the circuit. The alert resets automatically. The cause of the
alert is usually compressor wiring causing reverse rotation or a
faulty compressor.
Alarm Code T153 -- Real Time Clock Hardware Failure
The alert occurs when the RTC clock chip on the MBB is not
responding. Time and date functions will not operate, such as local
occupancy schedules. The unit will default to 24/7 unoccupied
mode. Recovery is automatic but MBB board replacement may be
necessary. Cycling power to the control and reconfiguring the time
and date should be tried before board replacement.
Alarm Code A154 -- Serial EEPROM Hardware Failure
The unit will completely shut down. The serial EEPROM chip on
the MBB which stores the unit’s configuration is not responding.
Recovery is automatic, but MBB board replacement may be
necessary. Cycling the power to the control should be tried before
board replacement.
Alarm Code T155 -- Serial EEPROM Storage Failure Error
Configuration data in the serial EEPROM chip can not be verified.
The unit will run to last know good values or defaults, and
therefore operating errors may occur. Recovery is automatic but
MBB board replacement may be necessary. Cycling power to the
control and reconfiguring the control points should be tried before
board replacement.
Alarm Code A156 -- Critical Serial EEPROM Storage
Fail Error
The unit will completely shut down. Critical configuration data in
the serial EEPROM chip can not be verified. Recovery is automatic
but MBB board replacement may be necessary. Cycling power to
the control and reconfiguring the critical control points should be
tried before board replacement. Check the configurations for the
following critical points:
ConfigurationCOOLN.CIR (Number of Circuits)
ConfigurationHMZRREHT (Humidi--MiZert Equipped)
Alarm Code A157 -- A/D Hardware Failure
The unit will completely shut down. The analog to digital
conversion chip on the MBB has failed. Recovery is automatic but
MBB board replacement may be necessary. Cycling power to the
control should be tried before board replacement.
Alarm Codes A163 and A164 -- Circuit Down due to Failure
Alarm codes A163 and A164 are for circuits A and B respectively.
These alarms have “Service Test” text that will be displayed if the
alarm occurred during service test. These alarms occur when a
circuit has 3 strikes. Use the Scrolling Marquee display to reset the
alarm. Investigate the alarm that caused the strikes to occur.
Alert Code T173 – Loss of Communication with the Energy
Management Module
This alert occurs when the MBB cannot communicate with the
EMM. These units do not currently support any operation with the
EMM. This alert is caused by an internal force to look for the
EMM board. When this happens, reload software on the MBB and
do not restore configurations, the factory configurations must be
used at first. Replace the MBB if alert continues.
Alert Code T175 – Loss of communication with VFD
This alert occurs when the Indoor Fan Type (Configuration
I.FAN FTYP) is set to 1 and the MBB cannot communicate
with the VFD. The control will shutdown the unit and prevent
normal operation. This alert will automatically reset when
communication is established again. This alert is usually caused by
a wiring problem or a incorrect configuration in the VFD or the
MBB.
Alert Code T179 – Loss of Communication with the
Economizer Control Board
This alert occurs when the MBB cannot communicate with the
ECB. Economizer operation will be disabled. This is usually
caused by a wiring problem. If a relative humidity sensor is
installed and configured but there is not an ECB installed on the
unit, this alert will be generated (the ECB is required for RH sensor
operation). Investigate using the Low Voltage Schematic, check
that the ECB address is correct, and verify the resistance between
pins on the LEN connections.
Alert Code T180 -- Loss of Communication with the
Economizer Actuator
This alert occurs when the ECB cannot communicate with the
Belimo Actuator. If the analog signal is connected properly, the
economizer can still be controlled thr
ough it. This is usually
caused by a wiring problem, actuator failure, or the wrong actuator.
Investigate using the Low Voltage Schematic. Make sure the
actuator is a MFT communication actuator and verify the feedback
signal from the actuator is correct.
Alert Code T181 – Loss of communication with Outside Air Unit
This alert occurs when the Outdoor Air Unit Type (Configuration
OAU OA.TY) is not set to 0 and the OAU Operating Mode
(Run Status OAU OA.OP) has not been communicated in
the past 3 minutes. The control will reset all OAU data. This alert
will automatically reset when communication is established again.
This alert is usually caused by a wiring problem or a problem with
the OAU communication.
Alarm Code A200 -- Linkage Timeout -- Comm Failure
This alarm occurs when the MBB fails to communicate with a
Linkage device. This only occurs when the MBB has previously
communicated with a Linkage device since last power cycle. If a
back up sensor was not installed the T074 alert will occur shortly
after this one. Reset power to the unit and verify Linkage is
communicating.
Alarm Code A404 -- Fire Shutdown
This alarm occurs when the shutdown input is either open or
closed depending upon its configuration. This alarm is usually
caused by an auxiliary device that is trying to shut down the unit,
e.g., smoke detector. The configuration for this switch input can be
found at variable ConfigurationUNITFS.SW. Verify that the
configuration is set correct, verify the wiring and auxiliary device.
This alarm resets automatically.
Alert Code T408 -- Dirty Air Filter
This alert occurs when the Filter Status switch senses a plugged
filter for 120 continuous seconds after the indoor fan has been
running for 10 seconds. Because the Dirty Air Filter switch can be
configured normally opened or closed, the switch might be open or
closed. The configuration for this switch input can be found at
variable ConfigurationUNITFL.SW. Verify that the
configuration is set correct, verify the wiring and filter status
switch. The hose should be connected to the low side of the switch.
This alert resets automatically.
Alert Code T409
There are 2 different texts for this alert code. Pressing enter and esc
on the marquee or navigator to expand the T409 alert will show
you one of the below alerts. Make sure the expanded text is read
correctly before troubleshooting.
S Fan Status Switch On, Fan Contactor Off
This alarm occurs when the fan status switch has sensed that the
indoor fan has been on for 10 seconds and the indoor fan
feedback has determined that the indoor fan should be off.
Because the Fan Status switch can be configured normally
opened or closed, the switch might be open or closed. The
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