Lennox MPA009S4S Service Manual page 137

Error Code:
F1
Description: Outdoor Temperature Sensor T4 Error.
General Note: If the voltage is lower than 0.06V or higher than 4.94V, the LED will display the error.
Check the connections between tempera-
ture sensor and PCB. Are the connec-
Check the resistance value of the sensor
via Appendix 1 and Appendix 2.
tions good?
Yes
No
Is it normal?
No
Replace the sensor.
No
Correct the connections
Replace indoor or out-
Yes
door PCB.
137