Honeywell MO08CESWK 8,000 BTU Compact Portable Air Conditioner CF Error Fix: Clean Filter Reminder

Error code CF on the Honeywell MO08CESWK 8,000 BTU Compact Portable Air Conditioner means: Clean Filter Reminder. The CF (Clean Filter) indicator has appeared after the programmed run-time interval — this is a reminder to clean or replace the air filter, not an error; remove the rear filter panel, vacuum or wash the filter with warm water, let it dry completely before reinstalling, then press and hold the Filter Reset button for 3 seconds to clear the CF indicator and restart the timer

The most successful fix is "Replace the Air Filter with Genuine Honeywell Part" (medium difficulty, ~30 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Replace the Air Filter with Genuine Honeywell Part") is rated medium difficulty and takes about 30 minutes. Tools needed: Flat-head screwdriver.

DIY cost: $15-$25. Professional repair typically costs $100-$150. Many homeowners save money by trying the top-ranked community fix first.

The Honeywell MO08CESWK 8,000 BTU Compact Portable Air Conditioner has 8 other known error codes, including: E1 (Room Temperature Sensor Fault), E2 (Evaporator Temperature Sensor Fault), E3 (Condenser Temperature Sensor Fault), E4 (Water Tank Full — Unit Stopped), E5 (System Defect — Contact Service), and 3 more.

Error code CF also appears on 1 other Honeywell model: MN14CCSBB 14,000 BTU Portable Air Conditioner with Dehumidifier and Remote Control. The fix may vary by model, so check each model's specific page for tailored repair steps.