F-1031, Section 2119
Page 13 of 24
It is important to know what to do if your compressed air foam system in not operating properly. This troubleshooting
guide should help you diagnose, isolate and fix the problem encountered.
Problem
Cause
Fix
Lack of air supply from air com-
pressor
Is the air compressor engaging?
No - Lack of air supply to air clutch (Eclipse)
Repair air leak or re-establish air supply to air
clutch. Check operation of the electric 3-way so-
lenoid valve.
No - No PTO engagement
Confirm “OK TO PUMP” light is illuminated. If not,
repair as needed.
Yes - Confirm Electric Auto-Sync settings
Pressures should be as follows:
Air PSI of 20-50 when in FIXED and UNLOAD
Air PSI of 45-150 when in FIXED
Air PSI to match pump discharge PSI in AUTO
(+/- 5%)
Air compressor operating properly,
no air supply to discharges
Malfunctioning air discharge solenoid(s)
Verify power and operation of discharge sole-
noid(s). Repair or replace as needed.
Verify proper wiring to solenoid (polarity sensi-
tive) - See F-1031, Section 3027 (S100 Eclipse)
or F-1031, Section 3028 (CX Eclipse) for wiring
schematic.
Malfunctioning air check valve(s)
Verify direction of check valve (arrow to dis-
charge) and correct as needed.
Air inlet trim valve out of adjustment
Reference “Control Air Circuit Calibration In-
structions” on Page 12.
Debris in air inlet trim valve (AITV)
Clean debris from air inlet trim valve (AITV).
Minimum Pressure Valve stuck
Disassemble and clean or replace as required.
FIXED and RUN develops PSI but AUTO
and RUN fails to develop PSI
Lacking water supply to balance trim valve
Reference “Control Air Circuit Calibration In-
structions” on Page 12.
Air discharge PSI does not match water
PSI (+/- 5%)
Air discharge pressure higher than water dis-
charge pressure
Circuit has an air leak or is uncoupled. Trace the
red hose circuit to locate leaks and repair as
needed.
Air PSI gauge is not tapped into correct location
Verify that the air PSI gauge is tapped into the
Master Air Pressure tap on the black solenoid of
the Electric AUTO/SYNC control.
Water PSI gauge is not tapped into correct loca-
tion
Verify that the water PSI gauge is tapped into lo-
cation shown on the dimensional assembly.
Air inlet trim valve out of adjustment
Reference “Control Air Circuit Calibration In-
structions” on Page 12.
Air or water gauge not calibrated
Recalibrate and/or replace as required.
Safety pop-off valve opening
Balance trim valve completely closed
Reference “Control Air Circuit Calibration In-
structions” on Page 12.
Waterous CAFS Customer’s Troubleshooting Guide
