# Thermistor failed main board

**URL:** https://forum.sovol3d.com/t/thermistor-failed-main-board/1875
**Category:** Sovol SV04 IDEX
**Tags:** extruder-kit, solved, official
**Created:** [March 3, 2023, 6:31am UTC](https://forum.sovol3d.com/t/thermistor-failed-main-board/1875 "2023-03-03T06:31:23Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![Bjoern](https://avatars.discourse-cdn.com/v4/letter/b/46a35a/32.png) [@Bjoern](https://forum.sovol3d.com/u/Bjoern)
#### Post date: [March 3, 2023, 1:14pm UTC](https://forum.sovol3d.com/t/thermistor-failed-main-board/1875/2 "2023-03-03T13:14:18Z")

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It is a good idea to check the heating cables and thermistor wires of that extruder you took apart:

- are the cables still in place with electrical contact to heater / thermistor?
- is the insulation of the cables still intact & free of crossovers (short circuits)?
- are the other ends of the cables still plugged in?
- are the cables free of any metal parts (e.g. extruder / blower housing) squeezing them?

If all the above is O.K. then you might want to check the electrical resistance of the thermistor using a multimeter. [It is described here.](https://forum.sovol3d.com/t/adjusting-incorrect-thermistor-values/505/2)

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