[BUG] Bed Heating "undershoots" by ~8°C

[Seref]

Bug Description

When setting the heated bed to 60°C it normaly rises to 52°C and then stops or rather holds the temprature, this triggers an error because the temprature isn't increasing. The overall system does reach 60°C when PID-Autotuning and also hold it there (I'm taking eight measurements).

My Configurations

Configuration_adv.zip I'm using an SKR Mini V1.2 E3 with an MK2B heated bed and a 100K NTC Thermistor with Marlin bugfix-2.0.x

Steps to Reproduce

1. Set the temp in Pronterface to 60°C
2. Wait

Expected behavior: It delivers "full power" until 60°C and then starts to hold the temperature

Actual behavior: Around 50-52°C it starts to hold the temperature

Additional Information

[ellensp]

This is often hardware. Possible cause are: Thermistor not secure on the bed, Bed wires not thick enough to power bed. Bed wires not securely fastened at controller. Power supply to week not providing enough current. No insulation under the heated bed.

[Seref]

This is often hardware. Possible cause are: Thermistor not secure on the bed, Bed wires not thick enough to power bed. Bed wires not securely fastened at controller. Power supply to week not providing enough current. No insulation under the heated bed.

Well I thought so too and replaced the Thermistor with a new one, added to that I also have insulation under my heated bed and like mentioned before when PID-autotuning it does reach 60°C without a problem and also holds it for eight measurements.

Edit: I did multiple runs and it always stopped 10°C before the set temperature. I also tried 70°C and it stopped heating 10°C before it at around 60°C

[Lord-Quake]

What happens with Marlin 2.0.0 ?

[Seref]

Okay well with 2.0.0 (same config files) it works without a problem!

[Seref]

Okay the latest bugfix-2.0.x fixes the problem.

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