125
T153 (Real Time Clock Hardware Failure)
The RTC clock chip on the MBB is not responding. Recovery
is automatic but typically board replacement may be necessary.
A154 (Serial EEPROM Hardware Failure)
The unit will be completely shut down. The serial EEPROM
chip on the MBB which stores the unit's configurations is not
responding. Recovery is automatic but typically board replace-
ment is necessary.
T155 (Serial EEPROM Storage Failure Error)
Configuration data in the serial EEPROM chip cannot be veri-
fied which may mean MBB replacement. It is possible that a
re-initialization of the database or particular storage area(s)
may clean up this problem. Reset is automatic.
A156 (Critical Serial EEPROM Storage Fail Error)
The unit is completely shut down. Critical configuration data
in the serial EEPROM chip cannot be verified which may
mean MBB replacement. Recovery is automatic but typically
board replacement is necessary.
NOTE: The machine will shut down. This may happen after
downloading via the CCN if the device code was corrupted. Try
downloading again or use the LEN connection to download.
A157 (A/D Hardware Failure)
The unit will be completely shut down. The analog to digital
conversion chip on the MBB has failed. Recovery is automatic
but typically board replacement is necessary.
A169 (Expansion Valve Control Board Comm Failure)
Cooling is disabled until communication with the EXV control
board is re-established. Recovery is automatic. Reason for fail-
ure may be incorrect wiring, power loss to the control board, or
damage to the RS-485 drivers on the LEN bus.
T170 (Compressor Expansion Board Comm Failure)
Compressors A3 and B3 are disabled until communication
with the CEB control board is re-established. Recovery is auto-
matic. Reason for failure may be incorrect wiring, power loss
to the control board, or damage to the RS-485 drivers on the
LEN bus.
A171 (Staged Gas Control Board Comm Failure)
Staged Heating is disabled until communication with the staged
gas control board is re-established. Recovery is automatic. Rea-
son for failure may be incorrect wiring, power loss to the staged
gas control board, or damage to the RS-485 drivers on the LEN
bus.
T172 (Control Expansion Module Comm Failure)
Any function associated with a sensor configured for use that
resides on the controls expansion module will be disabled until
communication is re-established. Recovery is automatic. Rea-
son for failure may be incorrect wiring, power loss to the con-
trol expansion module, or damage to the RS-485 drivers on the
LEN bus.
A173 (RXB Board Communication Failure)
As the RXB board is integral to all P Series units, the error will
cause a system shutdown until communication is re-estab-
lished. Recovery is automatic. Reason for failure may be incor-
rect wiring, power loss to the RXB board, or damage to the RS-
485 drivers on the LEN bus.
A174 (EXB Board Communication Failure)
The EXB board is responsible for building pressure control.
Building Pressure control configurations that require this board
will cause a complete system shut down when communication
failure occurs. Recovery is automatic. Reason for failure may
be incorrect wiring, power loss to the EXB board, or damage to
the RS-485 drivers on the LEN bus.
A175 (Supply Fan VFD Communication Failure)
The supply fan is disabled until communication with the sup-
ply fan VFD is re-established. Recovery is automatic. Reason
for failure may be incorrect wiring, power loss to the VFD, or
damage to the RS-485 drivers on the LEN bus.
T176 (Exhaust Fan VFD Communication Failure)
The exhaust fan is disabled until communication with the ex-
haust fan VFD is re-established. Recovery is automatic. Rea-
son for failure may be incorrect wiring, power loss to the VFD,
or damage to the RS-485 drivers on the LEN bus.
T177 (4-20 mA Demand Limit Failure)
If this transducer fails, and the unit is configured to perform de-
mand limiting with this transducer, no capacity limiting will be
performed and an alert will be generated. Recovery is automatic.
Reason for error is either a faulty sensor, wiring error, or dam-
aged input on the CEM control board.
T178 (4-20 mA Static Pressure Reset Fail)
If this transducer fails, and the unit is configured to perform
static pressure reset with this transducer, no static pressure re-
set will be performed and an alert will be generated. Recovery
is automatic. Reason for error is either a faulty sensor, wiring
error, or damaged input on the CEM control board.
A200 (Linkage Timeout Error — Comm Failure)
If linkage is established via the CCN with ComfortID™ termi-
nals, a 5-minute timeout on loss of communication will be moni-
tored. If 5 minutes expires since the last communication from a
VAV Linkage Master, the unit will remove the link and flag the
alert. When the rooftop loses its link, the temperature and set
points are derived locally. Recovery is automatic on re-establish-
ment of communications. Reason for failure may be wiring er-
ror, too much bus activity, or damaged RS-485 drivers.
T210 (Building Pressure Transducer Failure)
If the building pressure transducer (Pressures
AIR.P
BP)
fails, building pressure control fails also. Recovery is automat-
ic. Reason for error is either a faulty sensor, wiring error, or
damaged input on the RXB control board.
T211 (Static Pressure Transducer Failure)
If the static pressure transducer (Pressures
AIR.P
SP) fails,
static pressure control fails also. Recovery is automatic. Rea-
son for error is either a faulty sensor, wiring error, or damaged
input on the RXB control board.
T220 (Indoor Air Quality Sensor Failure)
If the indoor air quality sensor (Inputs
AIR.Q
IAQ) fails,
demand controlled ventilation is not possible. The control de-
faults to the max vent position. Recovery is automatic. Reason
for error is either a faulty sensor, wiring error, or damaged in-
put on the MBB control board.
T221 (Outdoor Air Quality Sensor Failure)
If the outdoor air quality sensor (Inputs
AIR.Q
OAQ) fails,
OAQ defaults to 400 ppm and demand controlled ventilation will
continue. Recovery is automatic. Reason for error is either a faulty
sensor, wiring error, or damaged input on the CEM control board.
T229 (Economizer Min Pos Override Input Failure)
If the economizer minimum position override input fails, the
economizer will operate as if it were not configured for override.
Recovery is automatic. Reason for error is either a faulty sensor,
wiring error, or damaged input on the MBB control board. This
error only occurs when the unit is configured for minimum posi-
tion override and a 4 to 20 mA signal is not present.
T245 (Outside Air Cfm Sensor Failure)
If the outside air cfm sensor (Inputs
CFM
O.CFM) fails, the
economizer will default to discrete positioning of the economiz-
er (Configuration
IAQ
DCV.C
IAQ.M, Configuration
ECON
EC.MN). Recovery is automatic. Reason for error is
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