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Self-diagnosis with faults:
A continuous beep or three successive 
beeps sound.
A continuous beep signals a fault in the 
electronics or a battery connected with the 
incorrect polarity.
● Turn the ignition key to the "engine off" 
position. (Ö 8.1)
● Check the polarity of the battery 
connections and connect the wiring 
correctly if necessary. (Ö 15.19)
● Repeat self-diagnosis.
If the continuous beep continues to 
sound even after the battery is correctly 
connected, an electronic fault is 
present. Consult your specialist dealer; 
STIHL recommends STIHL specialist 
dealers.
Three successive beeps signal a fault in 
the electrics (short circuit) or in the seat 
switch. It is not possible to start the engine.
RT 6112 C, RT 6112 ZL, RT 6127 ZL:
The relevant symbols and the text ERROR 
flash on the display.
● Turn the ignition key to the "engine off" 
position. (Ö 8.1)
● Have a detailed diagnosis carried out 
by a specialist dealer. STIHL 
recommends STIHL specialist dealers.
9.2 Ride-on mower faults during 
operation
The electronics monitor the safe condition 
during operation. Three successive beeps 
sound if there is a fault in the electrics 
(short circuit, loose connectors, broken 
wire).
The engine is stopped – the respective 
symbol and the text "ERROR" flash on the 
display on the models RT 6112 C, 
RT 6112 ZL, RT 6127 ZL.
Behaviour:
● Turn the ignition key to the "engine off" 
position. (Ö 8.1)
● Activate self-diagnosis. (Ö 9.1)
9.3 Electronics faults
In rare cases, electronics faults may occur 
during operation of the mower. A 
continuous beep sounds and the engine is 
stopped.
Behaviour:
● Turn the ignition key to the "engine off" 
position. (Ö 8.1)
● Activate self-diagnosis. (Ö 9.1)
● Restart the engine. (Ö 13.2)
Faults, operating information and active 
functions are shown on the display.
If the fault cannot be rectified, 
detailed diagnosis is necessary. 
Consult your specialist dealer; 
STIHL recommends STIHL 
specialist dealers.
If the fault cannot be rectified, 
detailed diagnosis is necessary. 
Consult your specialist dealer; 
STIHL recommends STIHL 
specialist dealers.
10. Display on the 
RM 6112 C, RM 6112 ZL, 
RM 6127 ZL
The display is protected against 
damage (e.g. due to water) on 
account of its design. It may be 
affected by fogging due to 
temperature variations and high air 
humidity. After the ride-on mower 
has been started, ingressed 
moisture dissipates within a few 
minutes under the influence of heat 
from the engine.
1 5-digit segmental display (Ö 10.1)
2 Set button (Ö 10.2)
3 Mode button (Ö 10.3)
Faults (Ö 10.4)
4 Engine oil pressure too low 
(RT 6127 ZL)
5 Battery fault
Operating information (Ö 10.5)
6 Reverse mowing
7 Driver's seat unoccupied
8 Grass catcher box open or missing
9 Fuel reserve
10 Grass catcher box full
11 Parking brake engaged