Lennox Core Unit Controller Setup Manual page 41

SELECTED ALARMS (MARKED WITH * IN TAbLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
DISPLAY MESSAGE
CODE
67* STRIKE3 HEAT2 CAI SW S45
68* HEAT2 NO PROOF GV2
NO FLAME PROOF AFTER TRIALS
69*
GV2
70 - 72 RESERVED
73 NETWORK SENSOR
74* ZONE SENSOR
75* OUTDOOR TEMP SENSOR
76* HUMIDITY SENSOR
77* DISCHARGE AIR TEMP SENSOR
78* RETURN AIR TEMP SENSOR
79* ID ADD ON BOARD PROBLEM
80 ID ADD ON BOARD PROBLEM
81 REHEAT SETUP ERROR
82 CONTROLLER RESET
83* INCORRECT SETTINGS
84 ADD ON BOARD NOT RESPONDING
85 INCORRECT HUMIDITROL
Table 11. CORE Control System Alarm and Event Codes
EVENT ACTION
Check heat section 2 combustion air motor and proof switch. Number of occurrences is
reached.
Check heat section 2 ignition control, flame roof, gas valve 2 and gas supply.
Check heat section 2 ignition control, flame roof, gas valve 2 and gas supply. Number of
occurrences is reached.
Check with integrator for refresh rate, network status lights and wiring.
• 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 detected
in specified operating range and return the system to monitoring the A2 sensor as the
primary sensor input.
Check zone (room) sensor and wiring
• If measurement of the outdoor 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.
• If measurement is below specified range ( <5 % RH) the system will ignore the
Relative 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
dehumidification 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.
• 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.
• 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 CORE 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 CORE Unit Controller
reset.
When the CORE Unit Controller is not able to communicate with any attached add-on
boards (C3 and GP3) this alarm code is logged. The CORE Unit Controller will retry to
establish the communication once every 5 second. Alarm is automatically cleared once
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 non- gas unit.
2. If the user sets up the unit to use Humiditrol reheat but the heater type is heat pump
If set when CORE Unit Controller powers up. Will Indicated reason for reset if known.
• Check system configuration (model number, Configuration ID 1 and ID 2. If a model
number is used that requires a daughter card, the CORE 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 CORE Unit Controller.
An add-on board did not respond or is not recognized when polled by main control
during system power-up. Add-on board with problem will have flickering heartbeat or no
heartbeat.
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.
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