What It Means
- REHEAT SETUP ERROR
Lennox Unit controller
Lennox Error Code 81
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 81
Check reheat settings. Alarm 81 is raised under these two conditions: 1. If the user sets up the unit to use supermarket reheat on a non- gas unit. 2. If the user sets up the unit to use Humiditrol+ reheat but the heater type is heat pump
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
REHEAT SETUP ERROR
MODEL L - M4 UNIT CONTROLLER, M4 Unit Controller
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.
