Overheat Protection (Outdoor Pipe)

What does Ud (100) mean?

The outdoor pipe thermistor (TH2) detects a temperature of 70°C [158°F] or more during compressor operation. This indicates either a defective outdoor fan (fan motor), a short cycle of the outdoor unit during cooling operation, or a faulty outdoor pipe thermistor (TH2).

• Outdoor pipe temperature has exceeded the overheat protection threshold (Ud code).
• Insufficient refrigerant flow causing localized overheating.
• Blockage in the outdoor unit's heat exchanger or piping.
• Ambient temperature is too high, leading to poor heat dissipation.

Click steps to track your progress.

1. 1

   Check the outdoor unit air passage for obstructions.

2. 2

   Turn the power off and on again to clear the error code. If U9 is subsequently displayed, follow the U9 troubleshooting procedures.