Lennox iHarmony 10C16 Installation And Setup Manual page 26

Initial notification of critical alerts will pop up on the home screen and will be listed under notification menu. Minor and moderate alerts are found only under the notification menu.
Actual
Alert Priority
Displayed Alert
Code Condition
Text
Discharge Air
310 Moderate Temp Sensor
Problem
Moderate / Low Damper
530
24VAC Voltage
Critical
Zoning Pressure
532 Moderate Switch Opened
(High Pressure)
Zone 1 Temp
542 Critical
Sensor Problem
Zone 2 Temp
543 Critical
Sensor Problem
Zone 3 Temp
544 Critical
Sensor Problem
Zone 4 Temp
545 Critical
Sensor Problem
Lost
Communication*
551 Critical
Table 24. Alert Codes and Troubleshooting
Component or System Operational State and Troubleshooting Tip
There is a discharge air temperature sensor issue.
• Compare discharge temperature sensor (DATS) resistance to temperature / resistance charts in system
component installation instruction.
• Replace discharge air sensor if necessary.
NOTE: Confirm there is no short or open circuits in the iComfort thermostat connections to any of the other
components in the communication system.
NOTE:
Issues with a DATS connected to a damper control module or equipment interface model will not gen-
erate an alert code.
• Check 24VAC voltage to all dampers.
• Check 24VAC damper transformer.
• Check connections.
Zoning Pressure Switch Opened (high pressure)
• Compressor pressure is above the specified limit.
• Compressor is turned off.
• Zoning will be restored once the high pressure switch closes.
Occasionally we get this with an AC system and the fix is to just jump out the pressure switch terminals on the
damper control module board.
NOTE: Zone heating will continue to operate in zoning mode with Aux heat until the pressure switch resets.
Possible Causes:
• Zone temperature sensor reading out of range.
• Check for loose or mis-wired connections at the zone sensor or damper control module terminals
• Open or short zone temperature sensor detected for more than five second.
• More than one zone sensor has the same assigned address Check zone sensor(s) address.
System Response:
• On both types of zone sensor the Indoor temperature will display "--" on the home screen.
• Damper control module will operate in central mode (all dampers open) in both moderate and critical priority
conditions.
• If after 10 minutes the condition does not change, the applicable alert code (542, 543, 544 or 545) is escalate
by the iComfort communicating thermostat to critical. System will continue to operate in central mode.
• At the iComfort communicating thermostat, only zone 1 screen will be available. The iComfort communicating
thermostat will display the alarm as "Problem (Zoning Control)". Email notifications will describe the issue as
" Zone "X" Temp Sensor Problem.
Any lost communication between the zone sensor and damper control module will result in the applicable error
code being display (543, 544 or 545) at the thermostat.
• A pop-up display will appear indicating communication error.
• Indoor temp is displayed as "--" on the home screen.
• When any zone sensor loses communication with the damper control module, the entire system will go into
central mode.
Check wiring between damper control module and the zone sensor reporting error code 551.
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How Alert Code is Cleared
Automatically clears 30 seconds after
condition is detected as recovered or
after system restart.
Replace transformer if applicable.
Automatically clears when the
condition no longer exists.
Automatically clears after compressor
pressure is within limits.
Automatically clears 30 seconds after
condition no longer exist.
Once communication is reestablished
the zone sensor will return to normal
zone operations.