F
−
1031, Section 2407
Page 8 of 8
Troubleshooting Guide
It is important to know what to do if your foam system in not operating properly. This troubleshooting guide should help
you diagnose, isolate and fix the problem encountered.
Problem
Cause
Fix
Poor foam solution (wet or dry)
Using wetting agent in place of foam
Flush system and install Class “A” foam.
Lack of foam
Check if the Foam Pump is on. Check if there is
foam in the reservoir. Make sure the foam supply
valve is on and the Y strainer clean.
Foam in water system
Foam dumped into the water tank
Flush water tank and pump until foam is cleared.
Foam cell is leaking into water tank
Condition applies to tanks utilizing a common
wall(s) between the foam tank and the water
tank. If a leak is confirmed, repair the foam tank
and flush the water tank and pump until foam is
cleared.
Foam proportioning manifold check valve mal-
function
If the above conditions have been corrected, the
final cause for foam in the water tank may be the
result of a malfunctioning foam manifold check
valve. To troubleshoot, cap off one foam dis-
charge that is plumbed to the foam manifold,
open that discharge valve and increase the
pump discharge to 30
−
40 PSI. Disengage the
pump and monitor the corresponding discharge
PSI gauge, looking for a drop in discharge pres-
sure. If the PSI drops, it indicates the foam man-
ifold check valve is leaking and requires repair.
Foam manifold drain plumbed into master drain
Supply a separate drain for foam manifold.
