What It Means
- Precirculation alarm (temporary fault).
Lennox Hydronic Heating
Lennox Hydronic Heating Error Code 109
Hydronic Heating:
Causes & actions from Lennox
How it shows
- boiler control fault display: 109
Call authorized SERVICE technician
Applicable models & manual sources
- GCWB95W-150
Precirculation alarm (temporary fault).
GCWB95W-150, GCWB95W-205, GCWB95F-150
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.
