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SECTION 6. TROUBLESHOOTING - CAFS
Observed
Probable Cause
Symptom
Lack of air supply to
Lack of air pressure
clutch (for air-clutch
from compressor
systems)
Compressor not
No PTO engagement
engaging
Auto-Sync switches not
in correct position.
(electric valves) Verify
there is power to the air
solenoid and check
operation of solenoid.
Compressor
engaging. No air
supply to
Air check valve defective
discharges or
Trim valve out of
insufficient air
adjustment
supply.
Restricted minimum
pressure valve
Air plumbed before
discharge valve seal
Incorrect air line size
System functioning
correctly, pressure
Gauge malfunction, air
gauge reading
line detached
obviously incorrect.
FIXED has
pressure but AUTO
No water supply to
has
balance valve.
no pressure
Red hose circuit
Air discharge
(compressed air control)
pressure too high
has leak or is
disconnected.
F-1031, Section 2416
Suggested Remedy
Repair air leak or re-establish air supply
Confirm OK TO PUMP light is on, if not check wiring for damage or disconnected wire,
check PTO.
Confirm 40 PSI in UNLOAD position (200 CFM systems) and 50+ in run position.
Smaller compressors have lower UNLOAD pressures.
Verify when in FIXED/RUN whether pressure reflects 145-150 PSI
Air discharge solenoid not working.
Repair/replace solenoid
Air solenoid working - leak between solenoid and discharge. Repair leak.
Replace or correct installation.
Refer to trim valve instructions
Clean rust or debris from valve
Relocate to discharge side of discharge valve
Size according to discharge and replace line with correct size.
Check for air leaks, replace gauge
Check line for proper installation, with no kinks or obstructions.
Refer to trim valve instructions.
Repair leak or attach hose
Page 15 of 23
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