Lennox Core Unit Controller User Manual

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Table 11. CORE Control System Alarm and Event Codes
SELECTED ALARMS (MARKED WITH * IN TABLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
CODE
DISPLAY MESSAGE EVENT ACTION
67* STRIKE3 HEAT2 CAI SW S45
Check heat section 2 combustion air motor and proof switch. Number of occurrences is
reached.
68* HEAT2 NO PROOF GV2 Checkheatsection2ignitioncontrol,ameroof,gasvalve2andgassupply.
69*
NO FLAME PROOF AFTER TRIALS
GV2
Checkheatsection2ignitioncontrol,ameroof,gasvalve2andgassupply.Numberof
occurrences is reached.
70 - 72 RESERVED
73 NETWORK SENSOR Check with integrator for refresh rate, network status lights and wiring.
74* ZONE SENSOR
• Ifmeasurementisoutofspecied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speciedrange(including
open/shortdetection)thesystemwillchangeoperatingmodetothespeciedBackup
mode (None, Local Thermistor or Return Air temp).
• The system will clear the alarm, if zone temperature sensor measurement is detected
inspeciedoperatingrangeandreturnthesystemtomonitoringtheA2sensorasthe
primary sensor input.
Check zone (room) sensor and wiring
75* OUTDOOR TEMP SENSOR
• Ifmeasurementoftheoutdoortemperaturesensorisoutofspeciedrange(including
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
• Ifmeasurementisbelowspeciedrange(<5%RH)thesystemwillignorethe
RelativeHumidityreadings.Ifmeasurementisabovethespeciedrange(>100%
RH) the system will limit the value to 100%.
• IfmeasurementofRelativeHumiditySensorisbelowspeciedrangewhilethe
dehumidication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
speciedoperatingrangeORdehumidicationmodeusingRHsensorisdisabled.
• Check sensor and wiring.
77* DISCHARGE AIR TEMP SENSOR
• Ifmeasurementofthedischargeairtemperaturesensorisoutofspecied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
• Ifmeasurementofthereturnairtemperaturesensorisoutofspeciedrange
(including open / short detection, the alarm will be activated. Alarm will automatically
clear once in range condition is detected.
• Check sensor and wiring.
79* ID ADD ON BOARD PROBLEM
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.
80 ID ADD ON BOARD PROBLEM
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.
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 non- gas 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 CORE Unit Controller powers up. Will Indicated reason for reset if known.
83* INCORRECT SETTINGS
• Checksystemconguration(modelnumber,Conguration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congurationalarmcanbeonlyclearedbyresettingorpowercycling
the CORE Unit Controller.
84 ADD ON BOARD NOT RESPONDING
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ickeringheartbeatorno
heartbeat.
85 INCORRECT HUMIDITROL
CheckHumiditrolsettings.CheckConguration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.

Lennox Core Unit Controller Specifications

General

Brand	Lennox
Model	Core Unit Controller
Category	Controller
Language	English