Lennox M33A036S4-1P - E4 Flow Chart

Lennox Mini-Split Service Manual / Page 205
Temperature sensor error
Check the connections between tempera-
ture sensor and PCB. Are the connec-
tions good?
Yes
No
No
Correct the connections
Check the resistance value of the sensor
via Appendix 1 and Appendix 2.
Yes
Replace indoor or out-
door PCB.
E4 Flow Chart
Is it normal?
No
Replace the sensor.