Lennox SLP98UHV Error Code E 201: Indoor Blower Communication Failure
What Does Code E 201 Mean?
Error code E201 on the Lennox SLP98UHV indicates that the control board has lost communication with the indoor blower motor. The SLP98UHV uses an ECM (electronically commutated motor) variable-speed blower that communicates digitally with the main control board. When this communication link fails, the furnace cannot operate the blower and shuts down all heating and cooling functions.
This failure can occur due to a loose or damaged wiring harness between the control board and the blower motor module. Power outages can also disrupt the communication handshake between the two components, sometimes requiring a full power cycle to restore the link.
If the problem persists after cycling power, the blower motor's integrated control module or the main control board may have failed. A technician will need to check the wiring connections, test the motor module, and verify the control board is sending proper signals.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Loose or failed wiring connection between control board and ECM blower motor | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- The code persists after cycling power to the furnace off and back on
- The blower motor does not spin at all during any operating mode
- You hear unusual humming or clicking from the blower compartment
✓ Verified against manufacturer service manual — March 2026