Lennox iComfort S30 Installation And Setup Manual page 56

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.
* Current Lennox modulating outdoor units are XC20, XP20, XC25 and XP25.
Applicable
Alert Priority
System
Code Condition
Component(s)
Furnace, air
handler or
180 Critical equipment
interface
module
200 Critical Furnace
Furnace or air
201 Critical
handler
Furnace or air
202 Critical
handler
Furnace or air
203 Critical
handler
204 Critical Furnace
205 Critical Furnace
206 Critical Furnace
207 Critical Furnace
Table 18. Alert Codes and Troubleshooting
Actual
Displayed Alert Component or System Operational State and Troubleshooting Tip
Text
The thermostat has found a problem with a system component's outdoor temperature sensor. In
normal operation after system component control recognizes sensors, the alarm will be sent if
valid temperature reading is lost.
• Compare outdoor sensor resistance to temperature / resistance charts in unit installation
Outdoor
instructions.
Temperature
• Replace sensors pack if necessary.
Sensor Problem
• At the beginning of (any) configuration, furnace, air-handler control or equipment interface
module will detect the presence of the sensor(s).
• If detected (reading in range), appropriate feature will be set as 'installed' and shown in the
'About' screen.
The furnace roll out limit switch is open. Correct the cause of roll out trip.
Rollout Limit
• Reset roll out switch.
Switch Open
• Test the furnace operation.
Lost communication with indoor blower motor.
Indoor Blower • Possible causes include power outage, brown-out, motor not powered, loose wiring,
Motor Problem condensation on system component control without cover on breaker.
• Problem may be on system component control or motor side.
The unit size code for the indoor unit and the size of blower motor do not match. Incorrect appli-
ance unit size code selected.
ID Blower Motor
& Unit Size • Remove the thermostat from the system while applying power and reprogramming.
Mismatch
• Check for proper configuring under unit size codes for furnace/air handler in configuration
guide or in installation instructions.
The unit size code for the indoor unit has not been selected.
Invalid Unit • Remove the thermostat from the system while applying power and reprogramming.
Code
• Check for correct configuration. Unit size codes for furnace and air handler are listed in the
system component configuration guide or installation instruction.
There is an issue with the furnace gas valve.
Gas Valve
Problem
• Check gas valve operation and wiring.
The furnace gas valve relay contact is closed.
Gas Valve relay
Contact Closed
• Check wiring on control and gas valve.
The furnace gas valve second-stage relay is faulty.
Gas Valve 2
nd
Stage Relay
• Furnace will operate on first-stage for the remainder of the heating demand
Failure
• If unable to operate second-stage, replace furnace control.
The furnace hot surface igniter is open.
HIS Sensed
• Measure the resistance of hot surface igniter.
Open
• Replace the igniter if it is not within the specified range found in furnace installation instruction.
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How to clear alert code
Automatically clears upon
configuration, or sensing normal
values.
Automatically clears after the fur-
nace roll out switch is closed.
Automatically clears after com-
munication is restored.
Automatically clears after the
correct match is detected follow-
ing a reset.
Automatically clears after the
correct match is detected follow-
ing a reset.
Automatically clears after the
issue is corrected.
Automatically clears after the
issue is corrected.
Automatically clears after the
issue is corrected.
Automatically clears after the
issue is corrected.