Dreame A2 mower cannot unlock repeated PIN request and wheel lift errors

Dear Dreame Support,

I am contacting you regarding my Dreame A2 robotic lawn mower.

Last Monday morning the mower was found stuck in a patch of grass. I manually placed it back on the charging base. The battery level was normal and the mower powered on correctly, however it immediately began requesting the PIN code.

Since then, the mower is unusable.

Observed behavior:

• 
  
  The correct PIN code is accepted but the mower does not unlock and immediately asks for the PIN again (infinite loop)
• 
  
  Constant “lifted” alarm while the mower is sitting flat on the ground
• 
  
  Rear right wheel error and rear left wheel error at the same time
• 
  
  The mower interface and screen are working normally
• 
  
  Charging works normally
  
  

Troubleshooting already performed:

• 
  
  Changed PIN code
• 
  
  Factory reset from the menu
• 
  
  Mapping deletion
• 
  
  Power cycles multiple times
• 
  
  App re-pairing attempt
• 
  
  Cleaning of wheels and underside
  
  

The problem persists exactly the same.

The mower now cannot be unlocked and cannot start mowing at all.

Based on the symptoms (PIN accepted but not validated, lift alarm, both rear wheel errors after wheel blockage), this appears to be a mainboard / motor controller communication failure rather than a mechanical obstruction.

The product has not been opened or modified.

Hello,

Thank you for providing the detailed information and for performing so many troubleshooting steps already. We are very sorry to hear that your Dreame A2 mower is experiencing these issues.

Based on the symptoms you described — including the repeated PIN request, continuous lift alarms, and simultaneous rear wheel errors — the issue does appear to be hardware‑related and cannot be resolved through standard troubleshooting procedures.

We recommend that you contact our after‑sales service team and provide the following information so they can arrange the appropriate next steps for you:

1.The mower’s serial number (S/N)
2.Proof of purchase

Thank you very much for your understanding. Our after‑sales service team will be glad to assist you and provide a solution as soon as possible.

After-Sales and Technical Support
0808 502 1616
aftersales@dreame.tech
(Mon. to Sun. 9:00–18:00)

Seems like the engineer checked the logs, they suspect it's a problem with the sensor wiring harness is there anybody with that trouble here ?