Fujitsu General 410A Error 21: Reverse VDD (electric air clean power supply circuit abnormal)

Fujitsu General 410A · taken from the manufacturer’s manual, pages cited

Error code21

Reverse VDD (electric air clean power supply circuit abnormal) The manual's first action is: “-Check if front panel and door are closed. -Check if main switch for open/close operation is opened. -Controller PCB defective.”

Model
Fujitsu General 410A
Display shows
21
Type
Error code
Source
Manual p. 25

What 21 means

Reverse VDD (electric air clean power supply circuit abnormal) p. 25

Common causes

  • Electric air cleaner error - When the air cleanliness monitor trial protection operates 4 times. p. 25
  • Electronic air clean filter error p. 25

What to do

  1. -Check if front panel and door are closed. -Check if main switch for open/close operation is opened. -Controller PCB defective. p. 25
  2. 4 flashes p. 25

If 21 is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact Fujitsu General service.

Open the manual at page 25 All 410A error codes Manual details & download

This page summarises what the manufacturer’s manual says about 21; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Fujitsu General. Found a mistake? Report an error.