What It Means
- CBK45UHPT, CBK45UHVT: R-input not available
- Open Circuit
- EL18KSLV: Compressor overload -drive module
Lennox Split & Multi-Split
Lennox Split & Multi-Split Error Code 5
Split & Multi-Split
5 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
R-input not available
Models: CBK45UHPT, CBK45UHVT
Air handler (indoor)
How it shows
- rds noncomm red flash led: 5 (red: flashing ×5)
Check sensor connections. Ensure connection is clean and tight.
Other manual wording (1 of 2)
CBK45UHVT
Check for 24VAC power connection to the R terminal inputs on the RDSC. R-inputs must be energized for the RDSC to function.
Other manual wording (2 of 2)
CBK45UHPT
Check for 24VAC pow- er connection to the R terminal inputs on the RDSC. R-inputs must be energized for the RDSC to function.
Applicable models & manual sources
- CBK45UHPT
R-input not available
- CBK45UHVT
R-input not available
- CBK45UHVT
R-input not available
- CBK45UHVT
R-input not available
- CBK45UHVT
R-input not available
- CBK45UHPT
R-input not available
Open Circuit
4 models
HSXB15, XC15, XP15, XP19
How it shows
- lsom alert led: 5 (alert: flashing ×5)
1Outdoor unit power disconnect is open. 2Unit circuit breaker or fuse(s) is open. 3Unit contactor has failed to close. (cid:4) Check compressor contactor wiring and connectors (cid:4) Check for compressor contactor failure (burned, pitted or open) (cid:4) Check wiring and connectors between supply and compressor (cid:4) Check for low pilot voltage at compressor contactor coil 4High pressure switch is open and requires manual reset. 5Open circuit in compressor supply wiring or connections. 6Unusually long compressor protector reset time due to extreme ambient tempera- ture. 7Compressor windings are damaged. (cid:4) Check compressor motor winding resistance
Other manual wording (1 of 3)
HSXB15
1 Outdoor unit power disconnect is open. 2 Unit circuit breaker or fuse(s) is open. 3 Unit contactor has failed to close. 4 High pressure switch is open and requires manual reset. 5 Open circuit in compressor supply wiring or connections. 6 Unusually long compressor protector reset time due to extreme ambient temperature. 7 Compressor windings are damaged.
Other manual wording (2 of 3)
XC15
1Outdoor unit power disconnect is open. 2Unit circuit breaker or fuse(s) is open. 3Unit contactor has failed to close. 4High pressure switch is open and requires manual reset. 5Open circuit in compressor supply wiring or connections. 6Unusually long compressor protector reset time due to extreme ambi- ent temperature. 7Compressor windings are damaged.
Other manual wording (3 of 3)
XP15
1Outdoor unit power disconnect is open. 2Unit circuit breaker or fuse(s) is open. 3Unit contactor has failed to close. 4High pressure switch is open and requires manual reset. 5Open circuit in compressor supply wiring or connections. 6Unusually long compressor protector reset time due to extreme ambient temperature. 7Compressor windings are damaged.
Applicable models & manual sources
- XP19
Open Circuit
- XP19
Open Circuit
- HSXB15
Open Circuit
- XC15
Open Circuit
- XP15
Open Circuit
Compressor overload -drive module
Models: EL18KSLV
Heat pump (outdoor)
How it shows
- el18kslv outdoor fault display: 5
- el18kslv pcb fault led: 5
compressor current or input current been detected by compressor drive module software(seconds leve l ）
Applicable models & manual sources
- EL18KSLV
Compressor overload -drive module
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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