Isn't mesh bed leveling in tool change g-code? That's run during T0 / T1 commands.
Check macros "tfree0.g" "tpre0.g" "tpost0.g"

I'm stupid. I don't know why but I had it in homeall.g
I didn't notice it before.
Thanks everybody for help

@randyl00123 What about using conditional Gcode with some global variable (turing on and off "verbose mode") and do conditional M117-display message in macro files?

@phaedrux
Took the board out, cleaned with IPA, tried several heat cycles on bench without issue, assembled back, taking care every connection is good, printed for 4 hours without issues. Today after one 0.5 hour print it's back again.

@phaedrux
I'll give it another try tomorrow. I thought it was fixed somehow, it worked now 2 days without issues, but today I came and again nothing was possible to print. It is really strange because first hour it was doing pre-heating fine but after that when homing and Z was triggered it shut down power supply. Then it become in a state i wasn't able to preheat. I disconnected everything keeping just power in, heater and thermistor connected and I still cannot preheat. I'll disassembly tomorrow also power supply and put it to bench and test there. Video from today here: youtube

@phaedrux No, but I'll try o take them down. I haven't tried it yet. But they are there for a longer time than I have the issue.

Yesterday I put back RRF, I made some minor adjustment from last setting (for new extruder/hotend) and tried to calibrate PID on hotend. It made a good test because it's heating on full power. And it passed! 🥳 No issue at all!

Then without touching board I tried to heat hotend to change filament and crap! In like 5 seconds power down again!

I really don't see anything what could cause the issue. And as I say it is strange because when I connect multimeter it shows me just 1.7A, only thing what could be causing it is some kind of current spike, but why?

@dc42 But it keeps doing also with disconnected heater. So it's switching power to open circuit and also it's failing.

@phaedrux
Yes, exactly. When no heater is connected and I turn on heating power supply reset. It looks like over current protection triggered, but on the other hand, it's not immediately, it took 5-10 seconds, sometimes 2-3. When I connect multimeter and check current I cannot see any abnormality. Of course I cannot see short current spike but why would that happen? After 2 seconds power supply "protection circuit" reset and it start to deliver power again.
I haven't tried to install previous extruder/hotend combo because I reused some parts, but after disconnecting current hotend/extruder combo I got same results = power supply resetting.
I'm currently not using RRF, I'm using Klipper, but I'll try to get back to RRF and see if problem persist.

Hi,

I have just recently changed my hotend/extruder combo and I've started to have an issue on my Duet 2 Meastro. After turning on hotend heater my power supply keep restarting when hotend heater is driven by 100% duty cycle. Is there anything coming to your mind what can be causing this issue?
What I've found yet:

• when I turn on bed heater everything is good and stable (without hotend heater). Bed heater is drawing ±8A
• when I drive hotend heater max 50% duty cycle is almost without issues (didn't tried long print but ±30 minutes turned on and everything fine)
• hotend connection OK, normal resistance, no short between wires, no short to heat block / thermistor
• when try to disconnect hotend heater and turn on output of that heater it keeps resetting (time is not stable but between 2-5 second on and then 2 sec off)
• use second heater output instead - same issue
• current draw measured from power supply - 1.7A when turn on hotend heater that's perfectly normal
• disconnected everything else from board (including extruder stepper, just bed heater, LCD, hotend thermistor (another one not from hotend) and XYZ steppers kept connected - same issue
• visual check of board - no issue found

I have no idea what other to try, I think I have eliminated everything already

I'm stupid. I don't know why but I had it in homeall.g
I didn't notice it before.
Thanks everybody for help

I changed M558 in config.g. to:

M558 P5 F100 H20 C"!zprobe.in" A3 T1200 S0.02

Thinking order of parameters can affect it. But no result. Even probing speed is not working for me
It still go to 2.6mm and speed of probing is 10mm/s.
To be sure I checked in console and it reports parameters which I set, but probing is doing differently.
"Z Probe 0: type 5, input pin !zprobe.in, output pin nil, dive height 20.0mm, probe speed 100mm/min, travel speed 1200mm/min, recovery time 0.00 sec, heaters normal, max taps 3, max diff 0.02"