Hotend preheat error #26202 (MK4S) #13202 (MK4) # 27202 (MK…

What happened?

The printer is showing the message "Hotend preheat error: Check the print head heater and thermistor wiring for potential damage"

Error name: Hotend preheat error

Error code: #26202 (MK4S) #13202 (MK4) # 27202 (MK3.9S) #21202 (MK3.9) #31202 (CORE One)

This error is shown when the printer can't heat the nozzle more than 2 ºC for 20 seconds. The printer starts a safety feature that instantly stops the heating process and displays the message on the screen. The printer then waits for the user to inspect all parts and if needed fix the issue.

How to fix it?

Make sure that the ambient temperature where the printer is is stable, and above 10 ºC.

Extruder inspection

This error can be caused by any damage to the hotend heater or the hotend thermistor.

Access the LoveBoard and check the heater and thermistor cables. Make sure that they are connected correctly and that there is no damage along their length.

xBuddy board inspection

On the main board check if the fuse that protects the extruder is not damaged.

Make sure that the Loveboard main cable is correctly connected to the xBuddy board.

Multimeter check

If you have a multimeter available, use this guide to check the resistance on the hotend heater and the hotend thermistor.

15 comments

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If the image for this page language english is missing, check other language pages, the german one has 2 pictures helping out.
In my case, Core One, I've managed somehow to swap 2 termistor cables. The imaged helped to check that both are next to each other and bingo, calibration is working.

MrBaleenTheWhale

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I've had this issue come up on my Mk4S after updating to the newest firmware (6.2.4). Tried going back to the previous firmware, followed all troubleshooting steps, but no fix.

The printer is reporting that the Nozzle temperature is at 196C at room temperature. I've not checked the thermistor resistance yet, but it's the only failure I think could still be viable. There's a way to Thermal model calibration for Mk3/+/S but not for Mk4/S. Could be useful for fixing issues like this?

Looking at getting a new thermistor, the price of shipping is more than the cost of the component itself...

Hubble

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Hello, I had the same issue, it was working on the mk4 alone (but at the edge of the hotend self test : some time failling and some time working). When I upgraded recently with the MMU3 I experimented the same symptoms as Dan. I controlled the hotend and the heater resistance was too high (15,8 ohm), not by far but out of spec. I bought a spare hot end, and now it works fine with the MMU3 ( the heater resistance was 14,1 ohm on the new one). My conclusion is that the initial hotend provided with the mk4 upgrade (from mk3s+) either had a default or was a bit damaged when I installed it.

MIC1980

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I observed the same behavior today with my MK4s with MMU3. I updated my MK4 to an MK4S a few months ago. Single prints without multicolor change run cleanly. But now I wanted to make the first print with color change today and after about 1 hour I always got the error. I can rule out technical errors as it otherwise works perfectly with normal printing. Is there a remedy in the meantime or should I contact support?

Kboruff

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I just completed my upgrade from 3s to mk4s.
I am getting this warning. I double checked and made sure the hotend thermistor wasn't plugged into the heartbreak spot. Tried again and the error continues. Attempting basic continuity tests for the hotend and thermistors didn't cause the piezo speaked in my innova to go off so something is strange.

Kboruff

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Turns out my heater cartridge arrived with a broken lead right above the heater block. Trying to get a replacement. The wires on my heater cartridge were also badly frayed.