What It Means
- CBK45UHPT, CBK45UHVT: Incompatible sensor type
- Short Cycling - Compressor is running only briefly
- EL18KSLV: Compressor drive module AC input over current
Lennox Split & Multi-Split
Lennox Split & Multi-Split Error Code 3
Split & Multi-Split
3 means different things on different Split & Multi-Split models. Enter your model number to see only your reading, or find your model below.
Causes & actions from Lennox
Incompatible sensor type
Models: CBK45UHPT, CBK45UHVT
Air handler (indoor)
How it shows
- rds noncomm red flash led: 3 (red: flashing ×3)
Replace the sensor
Other manual wording (1 of 2)
CBK45UHVT
Replace with a compati- ble sensor (Cat. # 26Z69)
Other manual wording (2 of 2)
CBK45UHPT
Replace with a com- patible sensor (Cat. # 26Z69)
Applicable models & manual sources
- CBK45UHPT
Incompatible sensor type
- CBK45UHVT
Incompatible sensor type
- CBK45UHVT
Incompatible sensor type
- CBK45UHVT
Incompatible sensor type
- CBK45UHVT
Incompatible sensor type
- CBK45UHPT
Incompatible sensor type
Short Cycling - Compressor is running only briefly
4 models
HSXB15, XC15, XP15, XP19
How it shows
- lsom alert led: 3 (alert: flashing ×3)
1Thermostat demand signal is intermittent. 2Time delay relay or control board is defective. 3If high pressure switch is present, see Flash Code 2 information.
Other manual wording (1 of 3)
HSXB15
1 Thermostat demand signal is intermittent. 2 Time delay relay or control board is defective. 3 If high pressure switch is present, check Flash Code 2 information. 4 If low pressure switch is present, check Flash Code 1 information.
Other manual wording (2 of 3)
XP15
1Thermostat demand signal is intermittent. 2Time delay relay or DCB is defective. 3If high pressure switch is present, see Flash Code 2 information. 4If low pressure switch is present, see Flash Code 2 information.
Other manual wording (3 of 3)
XC15
1Thermostat demand signal is intermittent. 2Time delay relay or control board is defective. 3If high pressure switch is present, see Flash Code 2 information. 4If low pressure switch is present, see Flash Code 1 information.
Applicable models & manual sources
- XP19
Short Cycling − Compressor is running only briefly
- XP19
Short Cycling − Compressor is running only briefly
- HSXB15
Short Cycling Compressor is running only briefly
- XP15
Short Cycling − Compres- sor is running only briefly
- XC15
Short Cycling − Compres- sor is running only briefly
Compressor drive module AC input over current
Models: EL18KSLV
Heat pump (outdoor)
How it shows
- el18kslv outdoor fault display: 3
- el18kslv pcb fault led: 3
AC Input over current been detected by compressor drive module or input current higher than main board setting.
Applicable models & manual sources
- EL18KSLV
Compressor drive module AC input over current
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
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