P4
TCL
Drain Pump Fault (for pump-equipped models)
Portable AC displays P4 and stops
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed internal condensate pump, Blocked pump discharge hose, Pump float switch stuck, Loose pump wiring connector
How to Fix / Troubleshooting
Safety first: Unplug the unit before opening any panels.
- Step 1 – Check external drain hose: Ensure the pump discharge hose is not kinked, elevated too high, or blocked at the outlet.
- Step 2 – Drain manually: If possible, drain the internal tank using the gravity drain to relieve water load on the pump.
- Step 3 – Inspect pump area: Access the pump compartment (per service manual). Clean any slime or debris around the float and pump inlet.
- Step 4 – Check wiring: Ensure the pump connector is firmly attached to the control board.
- Step 5 – Replace pump: If P4 persists and the pump does not run when water is present, replace the condensate pump assembly.
Warning: Water and electricity are a dangerous combination; ensure everything is dry before restoring power.
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Repair Difficulty
Medium
3/5
Required Part
Condensate Pump Assembly
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