12
XL-AS20015BM-en-US Rev B · 2019-09-05 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND, SAF,
and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.
Troubleshooting
6. Troubleshooting Chart
PROBLEM
POSSIBLE CAUSE
POSSIBLE REMEDY
Tire Pressure LOW
and Warning Light
ON
Damaged tire, rim, and/or valve stem Repair/replace tire, rim and/or valve stem
Air system valve closed
Open valve
Inadequate supply pressure
Supply pressure must be a minimum of 10psi greater than the desired tire pressure.
Correct as necessary.
Inadequate supply voltage
Supply voltage must be a minimum of 12V DC. Correct as necessary.
Defective Pressure Protection Valve
Replace pressure protection valve
Note: System cannot use the same PPV as the air suspension. A dedicated port on the
air tank is required with a dedicated pressure protection valve.
Defective pressure switch
Replace pressure switch
Defective solenoid valve
Replace control box assembly
Regulator out of adjustment
Adjust regulator
Defective regulator
Replace control box assembly
Corroded butt connectors at solenoid Replace butt connectors
Loose/leaking air lines or fittings
Spray all air lines and fittings with soapy water and repair leaks as needed
Leaking rotary union
Replace rotary union
Leaking tire hoses
Replace tire hoses
Tire Pressure LOW
and Warning Light
is OFF
Regulator out of adjustment
Adjust regulator
Inadequate supply pressure
Supply pressure must be a minimum of 10psi greater than the desired tire pressure.
Correct as necessary.
Inadequate supply voltage
Supply voltage must be a minimum of 12V DC. Correct as necessary
Leaking rotary union
Replace rotary union
Leaking tire hoses
Replace tire hoses
Tractor does not have constant
power to the center pin of the 7way
connector (constant blue)
Update tractor wiring to have constant power to the center pin of the 7way connector
(ABS constant blue)
Tire Pressure HIGH
and Warning Light
is ON
Low supply pressure
Incoming pressure must be greater than 100psi, or desired tire pr10psi
(whichever value is higher). Correct as necessary.
Low supply voltage
Incoming voltage must be greater than 12V DC. Correct as necessary.
Defective Pressure Protection Valve
Replace pressure protection valve
Note: System cannot use the same PPV as the air suspension. A dedicated port on the
air tank is required with a dedicated pressure protection valve.
Regulator out of adjustment
Adjust regulator
Defective pressure switch
Replace pressure switch
Defective solenoid valve
Replace control box assembly
Corroded butt connectors at solenoid Replace butt connectors
Loose and/or leaking air lines
and/or fittings
Spray all air lines and fittings with soapy water and repair leaks as needed
Leaking rotary union
Replace rotary union
Leaking tire hoses
Replace tire hoses
