Lennox Select Equipment
Lennox Error Code 4 Flashes
4 Flashes 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 Unit heater (indoor) Low flame signal - check flame sensorPrimary limit switch open.Primary limit, secondarylLimit, or rollout switch open + 3 more readings->
- Packaged Unit Packaged HVAC (indoor), Packaged HVAC (outdoor) Control lockout - failed to detect or sustain flameIgnition lockout from too many flame losses within single call for heat.->
What should you check next?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
