SECTION 5-4
MAINTENANCE
FLOWMAX RO MANUAL REV: B 05/1999
USFilter
United States Filter Corporation
5.4 TROUBLESHOOTING
PROBLEM: CONTROL POWER IS OFF
CAUSE
ACTION
Power source disconnect is opened or fuses
have blown.
Check the power source and fuses.
RO unit Control Panel fuses may be blown.
Check the fuses and replace them if necessary.
RO unit Control Panel low voltage circuit
breaker may be tripped.
Check the Control Panel low voltage circuit breaker
and reset it if necessary.
PROBLEM: RO UNIT WILL NOT START IN THE HAND MODE
CAUSE
ACTION
The RO unit pre-treatment interlock may be
engaged because of a filter backwash or a
softener regeneration cycle.
Check the operational status of the pre-treatment
system.
Check out the Control Panel circuitry to ensure the
proper jumpers have been installed.
Low feed pressure fault may have caused the
RO unit to drop out of service.
Turn the RO unit H-O-A switch to the OFF position
and then to the AUTO position. Allow the RO unit to
restart, and check that the feed pressure is at least 10
PSIG.
The RO unit Control Panel motor overload
may have tripped.
Reset the motor overload and observe the operation of
the RO unit to determine if this was a transient trip or
if there is a more serious electrical problem.
The RO unit Control Panel may have an
electrical component failure.
Inspect all components of the Control Panel.
PROBLEM: RO UNIT WILL NOT START IN THE AUTO MODE
CAUSE
ACTION
The RO unit pretreatment interlock may be
engaged because of a filter backwash or a
softener regeneration cycle.
Check the operational status of the pretreatment
system. Check out the Control Panel circuitry to
ensure the proper jumpers have been installed.
The RO water storage tank may be full.
No action is required. unit is in standby mode, storage
tank full indicator should be on.
The RO water storage tank level sensing
device may be broken or require adjustment.
Inspect the electrical functioning of the RO water
storage tank level sensing device. Inspect the settings
of the RO water storage tank level sensing device.
PROBLEM: AUTOMATIC FEED WATER VALVE WILL NOT OPEN
CAUSE
ACTION
Solenoid valve may have failed.
Replace the solenoid valve.
Feed water valve actuator may have failed.
Repair or replace the actuator.
