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4. System is using excessive
foam.
LVDT or water flow meter out of
calibration.
• Recalibrate LVDT and water
flow meter.
Wrong software version. • Contact Pierce for latest
software version.
Inspect the check valve at the
injection fitting.
• Foam should not leak past the
injection fitting check valve with
system OFF. If fitting leaks,
replace.
5. Delay before getting foam from
hand line.
Wrong software version. • Contact Pierce for latest
software version.
Needless flushing of system and not
recharging.
• See Chapter 3, Operating
Procedures.
System not turned on before
charging line.
• Turn on system at pump panel
as first step in operation.
Flowmeter (paddle wheel) sticking. • Pull flowmeter out of tee fitting
and clean with soap & water so
paddle spins freely.
6. Foam in water tank after using
foam system.
Hand lines not flushed. • Flush hand lines.
UPF tank issue. • Fill foam tank; add florescent
dye. Let unit sit overnight.
Check the water tank to see if
the florescent color is present in
the water. If so, the foam tank is
cracked.
Bad manifold check valve. • If foam manifold bleeds down
rapidly, replace or disassemble/
clean check valve. It is normal
for the manifold to bleed down
slowly.
Bad foam injection check valve. • Foam should not leak past the
injection check valve with
system OFF. If fitting leaks,
replace.
Manifold drain not bled down. • Manifold drain should be used
after each use.
7. Foam tank empty after pumping
operation with foam system
turned off.
Bad check valve for foam tank fill. • Check selector valve for being
in INJECTION mode.
Bad foam injection check valve. • Check injection check valve to
see if foam leaks by.
8. Tank fill inoperable. Selector valve in wrong mode. • Check tank fill/injection switch
at selector valve for being in
TANK FILL position.
Switch on Draft/Tank valve did not
open.
• Check Draft/Tank valve and the
switch on the valve. Switch will
open when in Draft Mode.
Float stuck full (false reading), High
Level Float.
• Check float. Make sure it moves
freely and opens/closes switch.
Tank fill check valve does not open. • Check to see if check valve is
free.
Table 4-3: General Troubleshooting
Symptom Possible Cause Corrective Action
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