Hi guys, where would you start to find problem of runaway temps on both the bed and the extruder, the temps are set for 55c on the bed, 200c on extruder, when I call for heat they both continue on past set temps until they reach max temp and then shut off. The printer is a prusi clone with Marlin 1.0.(DMYDP model P802MA).
Thanks for any help offered.
Terry