44
Moderate
Carrier · Central Air Conditioners & Furnaces
Blower RPM Below Set Speed
Quick Answer
Error code 44 on your Carrier Central Air Conditioners & Furnaces means: Blower RPM Below Set Speed. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Remove and clean the blower wheel thoroughly with a coil cleaner or degreaser
2
Verify blower speed dip switch settings match the installation requirements
3
Measure static pressure in the duct system and compare to specifications
4
Check ECM motor for fault codes using the motor's built-in LED diagnostics
5
If motor cannot maintain speed after cleaning, replacement is likely needed
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
ECM blower motor
Blower wheel
Coil cleaning solution
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