Revo Six Heater 5 fault and temperature readings

[Pertti]

My Revo Six has some difficulties in reaching temperatures over 200 degreeds.
Error: Heater 5 fault: temperature rising too slowly: expected 1.70°C/sec measured 0.55°C/sec

I run M303 H5 S240
result:
M307 H5 R1.801 K0.337:0.000 D1.40 E1.35 S1.00 B0 V24.0
The test looks like this:

The temperature readings seem to fly through rouhg air...
Do I need a new E3D Revo heatercore perhaps?

Board: Duet 2 WiFi (2WiFi)******************
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.4.1 (2022-06-01)

[infiniteloop]

@Pertti

Do I need a new E3D Revo heatercore perhaps?

Before spending money, you might want to check all connectors, crimps and wires, from the Duet up to the heater #5. These are the first suspects coming to mind.

[Phaedrux]

There were some issues with early Revo heater cores, so may want to check in with E3D.

[Pertti]

@Phaedrux Ok, looks like a thermistor issue.

[Adam_Sw3]

@Pertti I had a dodgy revo six heatercore, simply shot them an email and they sent me out a new one!