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Trouble Shooting Chart
Symptom
Symptom
Possible Cause
Possible Cause
Solution
Solution
The foam pump is operating but not
producing flow.
The foam pump is not primed.
Prime the foam pump.
The concentrate tank is empty.
Add concentrate to the tank.
The strainer is plugged.
Clean or replace the strainer.
The shutoff valve is closed.
Open the shutoff valve.
The check valve does not open.
Clean or replace the check valve.
The intake valves do not open.
Pressurize the suction side of the pump with water to clear any dried foam.
It takes too long for foam solution to
come out of the discharges.
The system has a flush valve or dual tank and is completely flushed after
each use.
Make sure to prime the system with Class A foam after flushing out Class
B foam. Most Class A foams are less corrosive and do not require the foam
pump to be flushed—turn the system off and just flush the foam manifold.
Only flush the foam pump after using Class B foam.
The pump is losing prime.
Air is entering the concentrate supply hose.
Repair or replace the deteriorated hose or improperly sealed fitting.
The concentrate supply hose is blocked, collapsed, or too small.
Repair or replace the hose.
The foam concentrate is too viscous (above 2000 centipoise).
Use foam with lower viscosity (below 2000 centipoise) and calibrate the
system for the foam being used.
Excessive concentrate is being injected
into the solution.
The speed sensor is misaligned or out of adjustment.
Check the alignment of the speed sensor.
The flowmeter is out of calibration.
Calibrate the flowmeter.
The system is operating in manual mode.
To enter or exit manual mode, refer to:
for the manual OIT and
"Operating in Normal Mode" on page
for the digital OIT.
The foam system is out of calibration.
Calibrate the foam system.
The foam control module is defective.
Replace the foam control module.
Insufficient concentrate is being
injected into the solution.
The flowmeter is out of calibration.
Calibrate the flowmeter.
The foam system is out of calibration.
Calibrate the foam system.
The foam concentrate is too viscous (above 2000 centipoise).
Use foam with lower viscosity (below 2000 centipoise) and calibrate the
system for the foam being used.
The pump runs at full speed whether
the foam pump is on or off.
The controller is malfunctioning.
Replace the controller.
The power connections are reversed.
Replace the controller—reversing the power connections will result in
instant damage.
The foam pump runs at full speed
whenever the foam system is on.
There is a bad ground between the controller and chassis.
Repair or replace ground wire or ground connection.
The green light on the OIT does not
illuminate when the foam system is
enabled.
The cables are not properly connected.
Make sure that all cables are properly connected.
There is a bad ground between the controller and chassis.
Repair or replace the ground wire or ground connection.
Improper voltage.
Make sure that the voltage supplied is correct.
