Fujitsu General 410A Error 42: Indoor heat ex. [P] thermistor error

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

Error code42

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

Model
Fujitsu General 410A
Display shows
Indoor heat ex. [P] thermistor error (42)
Type
Error code
Source
Manual p. 9

What 42 means

Indoor heat ex. [P] thermistor error p. 9

Common causes

  • -Check thermistor for open or short. p. 9
  • -Controller PCB defective. p. 9
  • Evaporator pipe thermistor detected an abnormal temperature. p. 9

What to do

  1. -Check thermistor resistance value p. 9
  2. -Ref. Thermistor Resistance Chart p. 9
  3. - Check thermistor for open or short. Check thermistor resistance value (Refer to "Thermistor characteristics table"). - Controller PCB defective. (Ref. Thermistor Resistance Chart) p. 9

If 42 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 9 All 410A error codes Manual details & download

This page summarises what the manufacturer’s manual says about 42; 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.