Hi. I got strange issue, i've build prusa i3 and get some successful prints, but today i started new print and on 4th layer get error "Error:Temperature heated bed switched off. MAXTEMP triggered !!", heat bed increase maxtemp (120C).
Restarted printer, in pronterface set bed to 100C and it heat and keep this temperature, but when when i started print it hit 105C (temp. fo 1st layer) and don't stop, increase to 115, i stoped the print, set temp to 0 in pronterface, but it don't turn off and continued increasing.
Thermistor is ok, i checked temp with ir thermometer.
RAMPS 1.4, marlin, mk2a heatbead.
In marlin BED_MAXTEMP is 120, in slic3r 105 for 1st and 100 for other.
p.s. Sorry for my english.