I am having an issue related to a newly purchased (genuine) BLTouch v3.0 and my i3 based printer running Marlin-1.1.9 on a RAMPS1.4 board. Around 15-20 seconds after the z-axis is homed using the BLTouch sensor, a ‘heating failed’ error is thrown, even without any heaters active. The BLTouch itself works as expected when homing and when using M280 commands.
Error always occurs 15-20 seconds after z-homing is completed. WATCH_TEMP_PERIOD is set to 20 seconds for extruders, and WATCH_BED_TEMP_PERIOD is 60 seconds. Both are set to 2 degrees temperature change.
The error thrown is “Heating failed, system stopped! Heater_ID: X - Printer halted. kill() called!”. The Heater ID X changes based on connector T0. If there is a thermocouple in T0, heater 1 will fail, but if T0 is not connected to anything, heater 0 fails.’
Printer was functional and while using a capacitive sensor. The homing is fine and works as expected, but then a few seconds after this error occurs.
This will happen at any time, including directly after a power cycle when running G28. No temperature change is notable in any sensors and OctoPrint does not indicate any heaters activating.
Though I believe this is a software issue, I have shielded the power and PWM signal wires for the BLTouch.
I haven’t been able to find any info online on this issue, and from what I understand on the manual, the LED indicators on the BLTouch are acting normal.
