What It Means
- SLP98UHV, SLP99UHV: No 24 Volt output on Y2 to C with noncommunicating outdoor unit.
- SL297UHNV: No 24 Volt output on Y2 of ”integrated control” with non?communicating outdoor unit.
Lennox Ducted Heating
Lennox Ducted Heating Error Code E348
Ducted Heating
E348 means different things on different Ducted Heating models. Enter your model number to see only your reading, or find your model below.
Causes & actions from Lennox
No 24 Volt output on Y2 to C with noncommunicating outdoor unit.
Models: SLP98UHV, SLP99UHV
How it shows
- Integrated control 7-segment display: E348
Y2 relay / Stage 2 failed (Pilot relay contacts did not close or the relay coil did not energize).
Applicable models & manual sources
- SLP98UHV
No 24 Volt output on Y2 to C with non−communicating outdoor unit.
- SLP99UHV
No 24 Volt output on Y2 to C with non- communicating outdoor unit.
No 24 Volt output on Y2 of ”integrated control” with non?communicating outdoor unit.
Models: SL297UHNV
How it shows
- Integrated control 7-segment display: E348
Y2 relay / Stage 2 failed. (Pilot relay contacts did not close or the relay coil did not energize; no input back to IFC chip). Critical Alert. Cleared after reset and Y1 input sensed.
Applicable models & manual sources
- SL297UHNV
No 24 Volt output on Y2 of ”integrated control” with non?communicating outdoor unit.
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.
