Honeywell MO08CESWK 8,000 BTU Compact Portable Air Conditioner P1 Error Fix: Water Collection Full (Pump Alert)

Error code P1 on the Honeywell MO08CESWK 8,000 BTU Compact Portable Air Conditioner means: Water Collection Full (Pump Alert). The water collection tank is full or the condensate pump has encountered an error — functionally similar to E4 but specifically triggered by the float switch or pump sensor; drain the tank using the drain plug at the base of the unit; check that the float switch moves freely and is not stuck in the up position; in dehumidifier mode, connect a continuous drain hose to avoid repeated P1 alerts

The most successful fix is "Replace Condensate Pump or Float Switch Assembly" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$30. 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 Condensate Pump or Float Switch Assembly") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Needle-nose pliers, Multimeter.

DIY cost: $15-$30. Professional repair typically costs $120-$180. 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: CF (Clean Filter Reminder), E1 (Room Temperature Sensor Fault), E2 (Evaporator Temperature Sensor Fault), E3 (Condenser Temperature Sensor Fault), E4 (Water Tank Full — Unit Stopped), and 3 more.

Error code P1 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.