What It Means
- 3WMC, M33C, MWMC: High pressure switch open
- 3WMC, M33C, MWMC: High pressure switch open Low pressure switch open
Lennox Split & Multi-Split
Lennox Error Code PC 03
Split & Multi-Split
PC 03 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
High pressure switch open
Models: 3WMC, M33C, MWMC
Mini-split unit (indoor)
How it shows
- 507550 indoor display: PC 03
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M33C
High pressure switch open
M33C, MWMC, 3WMC
High pressure switch open Low pressure switch open
Models: 3WMC, M33C, MWMC
Mini-split unit (indoor)
How it shows
- 507550 indoor display: PC 03
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M33C
High pressure switch open Low pressure switch open
M33C, MWMC, 3WMC
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.
