From a different model, but may have some relevance, check your manual if you have one
E9000: DPF must be regenerated, but low engine rpm is unable to start DPF regeneration.
Rev up the engine rpm and start DPF regeneration.
If this error code number still appears, immediately contact your local dealer.
E9006: DPF must be regenerated, but unable to start regeneration because the inhibit switch is activated. Move the machine to a safe place and release the inhibit switch to start DPF regeneration.If this error code
number still appears,immediately contact your local dealer.