151
Table 65. Prodigy 2.0 Alarm and Event Codes
Selected alarms (marked with * in table result in the closure of the service relay contacts (DO1).
EVENT ACTION
DISPLAY MESSAGE
ALARM
CODE
74*
ZONE (ROOM) SENSOR A2
If measurement is out of specified range (including open/short detection) the system
will ignore the Zone Temperature Sensor readings and set the alarm.
If measurement of Zone Temperature Sensor is out of specified range (including
open/short detection) the system will change operating mode to the specified
Backup mode (None, Local Thermistor or Return Air temp).
The system will clear the alarm, if zone temperature sensor measurement is detec
ted in specified operating range and return the system to monitoring the A2 sensor
as the primary sensor input.
Check zone (room) sensor and wiring
75*
OUTDOOR TEMPERATURE SENSOR
(RT17)
if measurement of the outdoor temperature sensor is out of specified range (includ
ing open / short detection, the alarm will be activated. alarm will automatically clear
once in range condition is detected.
Check sensor and wiring.
76*
HUMIDITY SENSOR A91
If measurement is below specified range ( <5 % RH) the system will ignore the Rel
ative Humidity readings. If measurement is above the specified range( >100% RH)
the system will limit the value to 100%.
If measurement of Relative Humidity Sensor is below specified range while the de
humidification mode using RH sensor is enabled, the system will set an alarm. The
system will clear the alarm if Relative Humidity sensor measurement is detected in
specified operating range OR dehumidification mode using RH sensor is disabled.
Check sensor and wiring.
77*
DISCHARGE AIR TEMP SENSOR RT6
if measurement of the discharge 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.
78*
RETURN AIR TEMP SENSOR (RT16)
if measurement of the return air temperature sensor is out of specified range (includ
ing open / short detection, the alarm will be activated. alarm will automatically clear
once in range condition is detected.
Check sensor and wiring.
79*
ADDON BOARD PROBLEM
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 establish
ing the communication this Alarm is logged. Alarm can only be cleared by M3 Unit
controller reset.
80
ADDON BOARD COMMUNICATION
PROBLEM
When the M3 unit controller is not able to communicate with any 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 communication is restored.
81
REHEAT SETUP ERROR
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
82
CONTROLLER RESET
If set when M3 unit controller powers up. Will Indicated reason for reset if known.
83*
INCORRECT SETTINGS
Check system configuration (model number, Configuration ID 1 and ID 2. If a model
number is used that requires a daughter card, the M3 unit controller will attempt to
detect the presences of the add-on board 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.
84
RESERVED
85
INCORRECT HUMIDITROL SETTINGS
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.
86*
CONFLICTING THERMOSTAT INPUT
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.
87 -90 RESERVED
