Fujitsu General 410A Error 4: Indoor heat ex. (Pipe) thermistor error

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

Error code4

Indoor heat exchanger thermistor error detected. The manual's first action is: “Check thermistor resistance value.”

Model
Fujitsu General 410A
Display shows
Indoor heat ex. (Pipe) thermistor error (4)
Type
Error code
Source
Manual p. 4

What 4 means

Indoor heat ex. (Pipe) thermistor error p. 4

Common causes

  • -Check thermistor for open or short. p. 4
  • -Controller PCB defective. p. 4
  • Primary unit: LED404 is lit. p. 4

What to do

  1. Check thermistor resistance value. p. 4

If 4 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 4 All 410A error codes Manual details & download

This page summarises what the manufacturer’s manual says about 4; 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.