P4
Blaupunkt
Inverter Module Overheat Protection
Unit shows P4 and may stop; often related to inverter module temperature.
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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
Blocked outdoor coil, Failed outdoor fan, Poor heat transfer from IPM to heatsink, High ambient temperature with inadequate ventilation
How to Fix / Troubleshooting
Safety first: Isolate power before cleaning or inspecting the outdoor unit.
Steps:
- Clean coil and fan: Ensure the outdoor coil is clean and the fan is operating correctly.
- Check installation: Verify that the outdoor unit is not installed in a confined or enclosed space that traps heat.
- Inspect PCB heatsink: With power off, check that the IPM module is firmly attached to its heatsink and that any thermal pads are intact (visual only).
- Professional service: Persistent P4 may require replacement of the Blaupunkt outdoor inverter PCB if the IPM is overheating internally.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Inverter PCB / Outdoor Fan Motor
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