Lennox S40 - Page 81

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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
446
Service
Soon/Service
Urgent
OU Low Suction
Pressure Fault
Suction pressure < 40 psig in operation.
Error code initially will be a service soon and will escalate to service urgent and stop system operation. After
5-strikes during a single thermostat demand. Recommend replacement of low pressure switch.
Recommend
replacement of low
pressure switch.
500 Service Soon
PA Differential
Pressure Sensor Fault
• Pressure sensor reports a fault for more than 5 minutes, or does not respond for more than 5 minutes.
• Device will not perform any pressure reading calculations until fault is recovered. Remaining lter life
display will indicate “-“ while fault exists.
Automatically clears 30
seconds after fault is
recovered.
501 Service Soon PA UV Sensor Fault
• Ultra-violet (UV) sensor reports a fault for more than 5 minutes or UV sensor does not respond for more
than 5 minutes.
• Device will not perform any UV lamp life remaining calculations until fault has recovered. Life remaining
display shall indicate “-“ while fault exists.
Automatically clears 30
seconds after fault is
recovered.
502 Service Soon PA UV Lamp Off
The light is determined to be off when the last three last light intensities measurements are below the set
threshold.
Light is determined
on after 1 set of ve
samples are above the
set threshold.
503 Service Soon PA Filter Life At 10% Filter life remaining determined to be <=10%, but greater than 0%. None
504 Service Soon PA Filter Life At 0% Filter life remaining determined to be 0%. None
505 Service Soon
PA Model Selection
Changed
Model Selection jumper has changed positions.
Jumper repositioned
back to original jumper
position or system
rebooted.
506 Service Soon PA Lamp At 0% life Ultra violet lamp life is at 0%. None
507 Service Soon
PA Filter Calibration
Failure
• Filter calibration determined failed due to all test cfm static pressures reading <= 7 Pa.
• Send alert code immediately.
• No lter tests or life calculation occur while this alert code is active.
Clear alert code upon
initiation of another
lter calibration.
530 Service Soon
ZS Low Damper
24VAC Voltage
• Check 24VAC voltage to all dampers.
• Check 24VAC damper transformer.
• Check connections.
Replace transformer if
applicable.