Strange fan problem all of a sudden

MartinNYHC

Duet 2 Wifi with RRF 3.2.2. Since two days - all of a sudden - I have a problem with my bed fans and can't figure out what's the cause.

; Fans
M950 F0 C"fan0" Q1000                                   ; create fan 0 on pin fan0 and set its frequency
M106 P0 C"Bed" S1 H-1                                  ; set fan 0 name and value. Thermostatic control is turned off
M950 F1 C"fan1" Q2000		                           ; create fan 1 on pin fan1 and set its frequency
M106 P1 C"Hotend" L0.70 H1 T70 S0.70 B5                ; set fan 1 name and value. Thermostatic control is turned on
M950 F2 C"fan2"										   ; create fan 2 on pin fan2
M106 P2 C"Light" S0.5 H-1							   ; set fan 2 name and values

The bed fan is no longer working. If I put it to a permanent fan port it works. If I move it to port another PWM port it also works. But it doens't work on PWM port fan0. How can this be?

Thx for your help guys.

Phaedrux

@martinnyhc said in Strange fan problem all of a sudden:

How can this be?

One possibility is that the fan0 mosfet has failed. Do you see any visible damage?

Similar to that shown here: https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_Fan_mosfet

MartinNYHC

@phaedrux That's it Thx!