Lennox Prodigy 2.0 Application Manual page 141

ALARM ALARM
TYPE TYPE
CODES CODES
DISPLAY MESSAGE
78 ALARM RETURN AIR TEMP SENSOR (RT16)
79 ALARM ADD­ON BOARD PROBLEM
80 ALARM ADD­ON BOARD COMMUNICATION PROBLEM
81 ALARM REHEAT SETUP ERROR
82 RESERVED
83 ALARM INCORRECT SETTINGS
84 RESERVED
85 ALARM INCORRECT HUMIDITROL SETTINGS
86 ALARM CONFLICTING THERMOSTAT INPUT
87 -90 RESERVED
91 ALARM OUTDOOR ENTH SENSOR A7
92 ALARM INDOOR ENTH SENSOR A62
93 ALARM BACKUP MODE
94 - 98 RESERVED
98 ALARM CONTROLLER PROBLEM
TABLE 66. PRODIGY 2.0 ALARM CODES
Event Action
if measurement of the return air temperature sensor is out of specified range (including open / short detection, the alarm
will be activated. alarm will automatically clear once in range condition is detected.
Check sensor and wiring.
Add-on board problem, reset M3 unit controller to clear. When the communication alarm 80 persists for more than 30
seconds even after several retries for establishing the communication this Alarm is logged. Alarm can only be cleared by
M3 Unit controller reset.
When M3 is not able to communicate with any of the attached Add On boards (C3 and GP3) this alarm code is logged. The
M3 Unit Controller will retry to establish the communication once every 5 second. Alarm is automatically cleared once the
communication is restored.
Check reheat settings. Alarm 81 is raised under these two conditions:
1. If the user sets up the unit to use supermarket reheat on a non­gas unit.
2. If the user sets up the unit to use Humiditrol reheat but the heater type is heat pump
Check system configuration (model number, configuration ID 1 and ID 2 if a model number is used that requires a daugh­
ter card, the M3 unit controller will attempt to detect the presences of the daughter card. if not detected, this alarm will be
set.
This Hardware configuration alarm can be only cleared by resetting or power cycling the M3 unit controller.
Check Humiditrol settings. Check Configuration ID 1, position 1 and verify that the position is not set to U. Should be set to
either N (not installed) or H (Humiditrol). Alarm will automatically clear once correct option is set.
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.
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 Enthalpy) and 'ODE differential' (Outdoor
differential). Valid Indoor Enthalpy Sensor reading is required for 'ODE differential' (Outdoor differential).
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 Enthalpy) and 'ODE differential' (Outdoor
differential). Valid Indoor Enthalpy Sensor reading is required for 'ODE differential' (Outdoor differential).
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 M3 Unit Controller If NETWORK INTERGRATION 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.
Internal M3 unit controller problem. Reset to clear.