What It Means
- Outdoor ambient temperature sensor error (T4)
Lennox Split & Multi-Split
Lennox Error Code EC 53
Split & Multi-Split: Mini-split unit (indoor)
Causes & actions from Lennox
How it shows
- 507550 indoor display: EC 53
- 508242 indoor display: EC 53
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M33C
Outdoor ambient temperature sensor error (T4)
M33C, MWMC, 3WMC
- MWCB
Outdoor ambient temperature sensor error (T4)
MWCB, MWHB
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
What should you check next?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
