If you machine shows an error6. That means the hotbed failed to heat up.
There are several reasons caused this.
1. The hotbed cable is broken. If it is this situation, you need a new hotbed cable.
2. The hotbed thermistor is broken. If it is this situation, replace a hotbed thermistor can solve the issue.
3. The hotbed is broken as the following picture shows. This may caused by the hotbed is been too low, then it scratch the back motor cause the broken.
