Duet. 0.6 temp problem

Hello and excuse me for my poor english (I write from Italy).
I have a problem with my old Ormerod 2 (528.2): I finally decided to update firmware (now 1.26.1) and web interface (1.22.6)..... but when I restarted the printer, bed and hotend show 2000° (open circuit) !
I test the thermistors (both 122k) and also wires appear ok. Pheraps a bad config.g or a vssa fuse problem?
This is my config heaters section:

; Heaters
M305 P0 T10000 B3988 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C

Thanks

Edited 1 time(s). Last edit at 04/04/2022 08:14AM by SM180.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Thanks
I post my question in hardware and wiring section.


Edited 2 time(s). Last edit at 04/05/2022 03:13AM by SM180.