PC02 Compressor top overheat (OLP)

What the control is telling you

The overload protector on top of the compressor opened (top above about 194 F / 90 C). Outdoor board shows P0; 48K HH shows P2. Note: the indoor manual's flow chart page for PC02 talks about IPM overheat instead; the error tables in both manuals say compressor top.

Applies to: DLCM(R/H)B multi-zone outdoor units with DLFSHBH high wall indoor units (Midea, Carrier, Viessmann)

Likely causes

• Poor indoor or outdoor airflow
• Low charge or restriction
• Bad OLP or loose OLP plug
• Bad PCB

Test and repair steps

1. Safety kill power at the disconnect and wait for the inverter capacitors to discharge before touching boards or wiring.
2. Check indoor and outdoor airflow clear the inlets, outlets and coils.
3. Leave power off 10 minutes so the compressor cools, then check whether the top is still above 194 F (90 C).
4. Check the overload protector (OLP) plug and wiring. With the compressor cool, the OLP should read 0 ohms; open = replace the OLP.
5. Check the refrigerant side for a leak or restriction and repair.
6. If OLP and system are good, replace the outdoor control PCB.

Models that show this code

12 models in Carrier DLCM(R/H)B multi-zone outdoor, Carrier DLFSHB high wall indoor

Other codes on the same units

• PC00 Inverter module (IPM) protection
• PC0A Condenser high temperature protection
• PC0F PFC module protection
• PC0L Outdoor temperature too low
• PC03 Pressure protection
• PC04 Inverter compressor drive error
• PC06 Discharge temperature protection
• PC08 Outdoor over-current protection