Roomba 400 error codes
"Uh-oh" + beepsError conditionPossible causes
0

Stopped due to wheel drop

Broken wheel drop switch wire; failed or contaminated wheel drop 

switch; wheel off cliff 

1

Main brush stall 

 

Clogged main brush bushings; broken motor wire, damaged main brush 

motor gearbox

2

Side-brush stall 

 

Hair jammed under sidebrush 

 
3

Vacuum stall 

 

Foreign material in impeller 

 
4

Drive stall 

 

Wheel jammed; dirty encoders; broken belt 

 
5

Constant cliff 

 

Contaminated cliff sensors; broken cliff wire 

 
6

Wheel drop rate 

 

Intermittent bad drop switch contacts 

 
7

Stasis stuck 

 

(never reached production) Failed stasis switch 

 
8

Vacuum connection failed 

 

(never reached production) Bad vacuum bin contacts. 

 
9

Wheel drop failure 

 

Broken wheel drop switch wire; failed or contaminated wheel drop 

switch