What It Means
- Communication problem between boiler board and control unit. Probable short circuit on wiring.
Lennox Hydronic Heating
Lennox Error Code 83-84-85 86-87
Hydronic Heating:
Causes & actions from Lennox
How it shows
- boiler control fault display: 83
- boiler control fault display: 84
- boiler control fault display: 85
- boiler control fault display: 86
- boiler control fault display: 87
Call authorized SERVICE technician
Applicable models & manual sources
- GCWB95W-150
Communication problem between boiler board and control unit. Probable short circuit on wiring.
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.
