Hello XXADRIANOXX & welcome to the forum,
the error message indicates temp errors of hot-bed or nozzle(s).
Nozzle check:
Examine heating cables and thermistor wires at each extruder:
- are all cables in place with electrical contact to heater / thermistor?
- is the insulation of the cables intact & free of crossovers (short circuits)?
- are the other ends of the cables still plugged in?
- are the cables free of any metal parts (e.g. extruder / blower housing) squeezing them?
Hot-bed check:
Unscrew & unplug the hot-bed Gx16-5 plug at the back of your SV04. Test the electrical resistance of the heater & the thermistor using a multimeter: The plug has 5 connector pins. Pin 1 & 2 at the right side of the plug connect the heater, measurement should show in 2.6 ohms.
Pin 4 & 5 at the left side of the plug connect the bed thermistor, measurement should show around 72 kilo ohms at 32°C.
In case of 0 ohms between pin 4 & 5 there is a short circuit that can be solved as shown here.
If all the above is O.K. then you need to check the electrical resistance of the nozzle thermistors using a multimeter, too. It is described here.
Good luck!
Björn