How do I fix error code Fd on a Samsung refrigerators?

1. undefined: Monitor defrost heater operation — buzzer beeps 0.5s ON / 0.5s OFF during defrost 2. undefined: Cancel by pressing test mode button again or by cycling power

Samsung Refrigerators2018–present

Error Code Fd

Q: What does error code Fd mean on a Samsung refrigerators?

Unit is in forced defrost mode Service test mode: Freezer Key + Alarm Key held 8 seconds, then two key presses to reach defrost mode

Unit is in forced defrost mode

Minor

Usually easy to fix - may resolve on its own

Also displayed as: Fd on display

What This Means

Service test mode: Freezer Key + Alarm Key held 8 seconds, then two key presses to reach defrost mode

What actually causes this:

Service mode intentionally activated for defrost system testing.

First Thing to Check

Verify forced defrost was intentionally activated during service; if not, cycle power to cancel.

Parts Involved

Defrost heater (AC 120V, 300W)F-DEF sensor (DTN-C502)

How to Fix

1
Monitor defrost heater operation — buzzer beeps 0.5s ON / 0.5s OFF during defrost
2
Cancel by pressing test mode button again or by cycling power

This Error Applies To

Samsung RH22H9010S Series Refrigerators (2018) (2018–present)

Service manual exact match: RH22H9010SR/AAService manual exact match: RH29H90**Service manual exact match: RH29H9000SR/AAService manual exact match: RH22H90**

Related Error Codes

PC-Er / PC-Ch

Display panel and main control board cannot communicate

44Er

Main control board and inverter board cannot communicate

46Er

I/O expander chip on main board has a communication fault

oP-Er / oP-Ch

There is a configuration mismatch between the panel and main boards

O-FF

Refrigerator is in Cooling Off mode — not cooling

Unit is in forced manual operation / cooling test mode

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