Lennox iComfort S30 Installation And Setup Manual page 52

Table 1 Alert Codes and Troubleshooting
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
Critical alerts are displayed on the Home screen, in the Homeowner alert button, and in the Installer alert button.
Minor and moderate alerts are found only in the Installer alert button.
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
Outdoor Temperature unit installation instructions.
Sensor Problem
√ Replace sensor pack if necessary.
√ 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.
√ Reset roll out switch.
Rollout Limit Switch Open
√ Test the furnace operation.
Lost communication with indoor blower motor.
√ Possible causes include power outage, brown-out, motor not powered,
Indoor Blower Motor
loose wiring, condensation on system component control without cover on
Problem
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 appliance unit size code selected.
√ Remove the thermostat from the system while applying power and repro­
ID Blower Motor & Unit
Size Mismatch gramming.
√ 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.
√ Remove the thermostat from the system while applying power and repro­
gramming.
Invalid Unit Code
√ Check for correct configuration. Unit size codes for furnace and air handler
are listed in the system component configuration guide or installation in­
struction.
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.
nd
Gas Valve 2 Stage
√ Furnace will operate on first-stage for the remainder of the heating demand
Relay Failure
√ If unable to operate second-stage, replace furnace control.
The furnace hot surface igniter is open.
√ Measure the resistance of hot surface igniter.
HIS Sensed Open
√ Replace the igniter if it is not within the specified range found in furnace in­
stallation instruction.
52
How to clear alert code
Automatically clears upon configu­
ration, or sensing normal values.
Automatically clears after the fur­
nace roll out switch is closed.
Automatically clears after commu­
nication is restored.
Automatically clears after the cor­
rect match is detected following a
reset.
Automatically clears after the cor­
rect match is detected following a
reset.
Automatically clears after the is­
sue is corrected.
Automatically clears after the is­
sue is corrected.
Automatically clears after the is­
sue is corrected.
Automatically clears after the is­
sue is corrected.