Lennox Select Equipment
Lennox Error Code E203
E203 means different things on different Lennox equipment. Choose the equipment you are working on.
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always refer to your unit's service manual.
What does it mean? Select your equipment
- Ducted Heating Appliance capacity / size is NOT programmed. Invalid unit codes refer to configuration flow chart.Appliance capacity / size is NOT programmed. Invalid unit codes refer to configuration flow chart in installation instructions.Furnace control does not recognize unit size code: three horizontal bars followed by continuous E203.->
- Split & Multi-Split Air handler (indoor), Mini-split unit (outdoor) No air handler model size and capacity selected. Check for proper configuring under Configuring Unit Size Codes.Communication error between the outdoor unit and main micom (For PF #4 to #6 controllers, error will be determined from the time when the…->
What should you check next?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
