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I had a perfectly running Rostock Max v2 until I tried to change the nozzle and shorted the wrench to the heating resistor (on the side that does NOT have the thermister). There was an arc/spark and she went dead as in completely dead, no led lights, no lcd screen, nothing (except the power supply) Discovered that the F3 fuse was bad. Ordered replacement fuses form ultimachine, got them today and replaced the F3 fuse. I now have power, LCD screen works, I can connect to pC, fan works, motors work, etc...

The problem now is my bed and nozzle temps are DEF on the LCD screen and neither will heat up.

So... where do I go from here? Did the short cause the resistor that shorted to go bad? Or something else? What do I test?

Secondly, locally, Fry's electronics I believe has heating resistors but they are 5.2 OHM or 10 OHM, not the 6.8 ohm as the kit came with. If that is the part I need, can I use one of those? (and let the auto calibration deal with the difference)

Thank you for any help.

On the main board, the "Indicator LED's" show green for power and nothering for status in case that helps someone understand what is going on with my printer. So...

Top LED - not lit
Bottom LED - green

i would check the thermistor on the hotend first. It is either not hooked back up on the proper spot on the rambo board, or you broke a lead at the hotend side, when you were wrenching around.

Hi, thank you for the response. I didn't ever disconnect anything from the rambo board except the LED display connects so I could remove the fuses so it shouldn't be in the wrong place (it was working fine before the short). The thermistor is still inside the hot end, engulfed in the sealant and the leads look fine. Could the thermistor have blown when the resistor was shorted with the wrench on the other side of the hot end?

Problem solved. I checked the connection for the thermistor on the main board and it was slightly out from the board (slightly unseated)... I pushed it firmly against the board and it now works. Crazy... thank you for suggesting I double check the cables...

You just help me with my own problem!.....I pushed it like you said and it work!
Thank You