Low Fan Speed Not Working - Heater Blower Resistor Coil Burned Out

Electricalbeginner✓ OP Confirmed

Problem

Climate control blower fan low speed not functioning. The lowest fan speed does not work during either heating or air conditioning operation.

Low fan speed not running during heatingLow fan speed not running during ACHigher fan speeds still work normally

Root Cause

The heater blower resistor module has a burned out coil. Specifically, the resistor coil between terminals 1 and 2 was open (broken), which controls the lowest fan speed setting.

Confidence

High confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted November 2025 on SupraForums.com