F-1031, Section 2449
Page 12 of 18
CAFS (Continued)
Problem
Probable Cause
Recommended Action
Air flow meter stuck at
high CFM
Move large amounts of air out discharge and turn air flow on and
off to re-couple.
Poor foam (wet or dry) or
no foam (assuming air
pressure to discharges is
OK)
Using wetting agent and not
foam concentrate
Use foam concentrate
Foam proportioning control
turned too low
Increase amount of concentrate delivered to manufacturer
recommended amount
Foam proportioning control
OFF or turned too low, foam
tank empty.
Make sure proportioner is turned on, foam supply valve is open,
foam tank has concentrate, Wye-Strainer is clean, and supply line
is connected to injector.
Discharge hose shaking
(slug flow)
Foam proportioner ON,
setting correct, and tank has
foam concentrate, but not
providing foam solution
Refer to foam proportioner manufacturer’s instructions for
detailed calibration and troubleshooting instructions
Foam in the water system
(when
proportioner turned off)
Foam concentrate was
poured into the on-board
water tank
Flush tank and pump with clean water, refill
Foam manifold drain lines
not isolated from water drain
lines
Isolate to separate drain valve
Cooler line plumbed from
manifold
Relocate line to discharge side of pump
Foam manifold check valve
defective
Rebuild/replace check valves
Water in compressor
oil/air
Leaking inside cooler Freeze
damage
Isolate cooler and check for leaks, replace if needed, check drain
Defective air check valve
Replace or check
Missing air check valves for
discharges
Install check valves
Clutch smoking
Engaging in RUN
position
Engage in AUTO/UNLOAD only
Slight air leak from solenoid
to clutch
Repair air leak
High RPM engagement
Engage in lower RPM
Not allowing compressor to
bleed down before
engaging clutch again
Allow for bleed down
Contaminated clutch disc
Clean or replace
Safety pop off valve
opening at
low pressure
Auto-Sync system out of bal-
ance
Adjust the Auto-Sync system, making sure to not open the trim
valve on the compressor more than 3 turns
Sump fire damaged pop off
valve
Check system for other damage and replace valve
Safety pop off valve
repeatedly opening
Trim valve or inlet
completely open
Refer to trim valve instructions
Troubleshooting Guide
