Lennox Core Unit Controller Setup Manual page 42

SELECTED ALARMS (MARKED WITH * IN TAbLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
DISPLAY MESSAGE
CODE
86* CONFLICTING TSTAT INPUT
87 UNIT DIP SWITCH CHANGED
88 ECTO CHIP PROBLEM
89 UNIT ADDRESS NOT VALID
90 RAM ERROR
91* OUTDOOR ENTHALPY SENSOR
92* INDOOR ENTHALPY SENSOR
93* BACKUP MODE
94* BAD ZONE SENSOR SETPOINTS
95 ECTO PARAMETER CHANGED
96 FOUR-STAGE INTERFACE FAILURE
FOUR-STAGE CONFIGURATION
97
ERROR
98 ECTO MEMORY CHIP WRITE ERROR
99* OAC ERROR
100* AIR VOL CONTROL SETUP ERROR
101* MGV CONTROL SETUP ERROR
102* GP CONTROL SETUP ERROR
103* ADV CTRL SETUP ERROR
104 RESERVED
ECONOMIZER CONFIGURATION
105
ERROR
106* BUILDING PRESS SENSOR
Table 11. CORE Control System Alarm and Event Codes
EVENT ACTION
Check thermostat inputs for simultaneous heat and cooling wiring. Once condition is
corrected, unit controller will resume operation after error time off day has expired.
UNIT (equipment type) DIP switch has changed while unit is energized. Check UNIT DIP
switch setting and reset control. Make sure the UNIT DIP switch settings agree with the
unit type.
This may indicate a problem with the ECTO chip.
No address is set on unit address DIP switch SW3. Any one switch on SW3 must be in ON
position. SW3 is factory set with switch #2 in on position.
RAM error.
• If Enthalpy Sensor failure is detected, the system will disable 'Free Cooling'
operation.
NOTE: Valid Outdoor Enthalpy Sensor reading is required for both 'ODE' (Outdoor
• Check economizer Parameters 160 and 161. Also check enthalpy Parameters 162
and 163.
• Check sensor and wiring.
If Enthalpy Sensor failure is detected, the system will disable 'Free Cooling' operation.
NOTE: Valid Outdoor Enthalpy Sensor reading is required for both 'ODE' (Outdoor
Check wiring and test A62 sensor using specified method in M3 application guide, section
titled economizer checkout.
• Check communication loss with network sensor or if CORE Unit Controller If
NETWORK INTEGRATION is set to RTU STANDALONE MODE and backup sensor
is set to RETURN AIR BACKUP.
• While running in backup mode the unit controller will set this alarm. The unit controller
will return from Backup mode to Primary (Main) mode on a reset or after the Primary
mode (room Sensor is not in error or OR network communication is re-established
and available for 300 seconds.
• Backup mode alarm will be cleared on the reset OR after the unit controller has
returned to primary (main) system mode.
Ensure that the heating and cooling set points honor the auto-changeover deadband.
ECTO parameter has been changed by the CORE Service application,
Four stage interface failure A138. ECTO 6.01 set to option 12 when no A138 board
present can also cause this alarm.
Four stage interface A138 detected but ECTO 6.01 is not set to option 12 or equipment
type is set to heat pump.
ECTO memory chip write error.
Check sensor and wiring. This alarm activates when the A24 sensor input signal is
continuously above 25% of sensor measuring range for more than five minutes with
blower stopped. The CORE Unit Controller will disable the Outdoor Air CFM control. The
alarm automatically clears when the sensor reading is below 10% sensor measuring range
for one minute.
Check for proper installation of GP board and settings.
Check for proper installation of GP board and settings.
Check for proper installation of GP board and settings.
Check CORE Unit Controller Configuration ID 1 settings.
Economizer configuration error.
Check sensor and wiring.
Enthalpy) and 'ODE differential' (Outdoor differential). Valid Indoor Enthalpy
Sensor reading is required for 'ODE differential' (Outdoor differential).
Enthalpy) and 'ODE differential' (Outdoor differential). Valid Indoor Enthalpy
Sensor reading is required for 'ODE differential' (Outdoor differential).
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