Lennox SLP98UHV Error Code E 202: Indoor Blower Motor Mis-Match
What Does Code E 202 Mean?
Error code E202 on the Lennox SLP98UHV means the indoor blower motor's horsepower does not agree with the unit capacity that is programmed into the SureLight Variable Capacity control. It is a configuration mismatch, not a mechanical breakdown of the motor itself.
Because this is a modulating furnace with a variable-speed ECM blower, the control board relies on a stored size code to know exactly which motor is installed and what airflow curves to command across the full range of firing rates. During installation or after a control board replacement, the technician must enter that size code. If the wrong code is selected, the board expects a different motor than the one actually wired in, and it flags E 202.
This is closely related to the other ECM configuration faults on this board. E 203 is raised when no capacity size code has been entered at all, while E 201 is a communication failure where the board cannot talk to the motor. E 202 is the specific case where the board can see the motor but its size does not match the programmed capacity. Left uncorrected, the mismatch can cause the blower to run at the wrong speeds, producing poor airflow, comfort complaints, or reduced efficiency.
What You'll Notice
- Airflow feels too strong or too weak for the amount of heating or cooling being delivered
- The code appears shortly after a new furnace installation or a control board replacement
- The 7-segment display shows E 202 in the diagnostic error history
- Comfort or short-cycling complaints that started right after recent service
- The furnace may still run, but performance seems off compared to before
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Incorrect furnace size code programmed during installation | Most common | ✗ Call a pro → |
How This Is Diagnosed
A technician compares the size code stored in the control against the actual model and blower motor installed, using the configuration guide shipped with the furnace or the values in the installation instructions. The stored capacity code is checked through the board's setup menu.
If the programmed code does not match the physical unit, the technician re-enters the correct size code and confirms the fault clears. They also verify the correct motor was installed in the first place, since a genuine wrong-motor situation (rather than a mis-entered code) requires correcting the hardware. Programming the size code is a pro-only setup step.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- This code appears after a new furnace installation or control board replacement
- The blower seems to run too fast or too slow for the heating or cooling output
- The furnace was recently serviced and the code appeared afterward
- You also see E 203, suggesting the capacity was never programmed correctly
Frequently Asked Questions
Is E 202 dangerous?
It is not an immediate safety hazard like a venting or gas fault, but it should still be corrected. A mismatched size code makes the variable-speed blower run at the wrong airflow, which hurts comfort and efficiency and can stress the system over time.
Can I reprogram the size code myself?
No. Entering the correct unit size code requires the manufacturer's configuration guide and access to the control's setup menu, and getting it wrong affects safety-related airflow. This is a job for a qualified HVAC technician.
Why did this appear right after my furnace was serviced?
If the control board was replaced or the setup menu was changed, the size code may have been entered incorrectly or reset. The technician who serviced the unit can re-enter the correct code to clear it.
✓ Verified against manufacturer service manual — March 2026