Lennox S40 - Page 55

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Table 21. Lennox S40 Smart Thermostat Alert Codes and Troubleshooting
E2A=Errors to Action, GF= Gas Furnace, AH=Air Handler, IU=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OU=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system,
SRS=Smart Room Sensor, TS=Thermostat , IAQ- IAQ Monitor and WE=Wi-Fi Extender
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual Displayed Alert
Text Under dealer control
center > Notications
Component or System Operational State and Troubleshooting Tip
How to clear
alert code
126
Service
Urgent
Control Internal
Communication Error
There is an internal hardware problem on the system component control. In addition, if you have zoning the
alert code is triggered when your zone temperature is deviating away from set point persistently.
• Typically the system component control will reset itself.
• Replace the system component (device) control if the problem prevents operation and is persistent.
Automatically clears
300 seconds after the
issue no longer exists.
130 Service Soon
Conguration Jumper
Missing
• Conguration jumper missing on equipment interface module.
• Install the missing jumper.
• Set as heat pump, furnace control or air handler control.
NOTE: This is applicable in non-communicating applications only.
Automatically clears
after the missing or
incorrectly installed
jumper is installed or
corrected.
132
Service
Urgent
Device Control
Software Fault
System component control software is corrupted.
• Recycle power.
• If failure re-occurs, replace the system component control.
Manual system power
reset is required to
recover from this alert
code.
180 Service Soon
Outdoor Temperature
Sensor Problem
The thermostat has found a problem with the outdoor temperature sensor. In normal operation after system
component control recognizes sensors, the alert code will be sent if valid temperature reading is lost.
• Compare outdoor sensor resistance to temperature / resistance charts in unit installation instructions.
Replace sensors pack if necessary.
• At the beginning of (any) conguration, 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.
Automatically clears
upon conguration, or
sensing normal values.
181 Service Soon
OU Suction Pressure
Transducer Fault
• Suction Pressure Transducer reading above 4.75V or below 0.25V for 24hrs +/- 3hrs. Run on staged
operation.
Resets after 3
consecutive readings
that are in range
182 Service Soon
OU Suction
Temperature Sensor
Fault
• Reading below 0.25V or above 4.75V for 24hrs +/- 3hrs. System will continue to operate normally.
Resets after 3
consecutive readings
that are in range
183 Service Soon
OU Liquid Pressure
Sensor Fault
• Under 0.25V and above 4.75V readings for 24 hours +/-3hrs or more on the sensor will cause this error.
• Continue normal operation, see sections related to low pressure switch emulation for specic details
related to low pressure switch faults.
Resets after 3
consecutive readings
that are in range
184 Service Soon
OU LIquid Temperature
Sensor Fault
• Sensor shorted or open for 24 hours +/-3hrs or more.
• Continue normal operation.
Resets after 3
consecutive readings
that are in range