56 Culligan® Culligan Top Mount (CTM) Water Filters
56 Cat. No. 01029343
Troubleshooting
Drain Line Flow Control—Service
Located on the drain connection of the valve, the purpose of the backwash flow controller is to regulate the up flow back-
wash required to expand and agitate the media in the filter. The filter will allow maximum expansion of the media, while
preventing any loss to the drain.
The flow control principle is simple and trouble free. The specified rate of flow will be constant regardless of inlet pressure
variations.
Occasionally, the Backwash Flow Controller may become plugged with scale, rust, or other foreign material. If this occurs,
cleaning is required. This can be done while the filter is in SERVICE and under pressure.
General Troubleshooting
NOTE Error Codes can be found in the GBE Programming for Commercial Softeners and Filters manual
(01027295)
PROBLEM OR SYMPTOM CHECK PROCEDURE CAUSE
Slight Leak to Drain Disconnect pilot valve tubing at drain port
on the valve.
Flow from tubing indicates leaky seal in
pilot valve spool.
If pilot valve is not leaking, use a test kit
and check for hard water at the drain.
Possible missing or damage piston/cap
O-Rings or T-Seal. If water tests soft
then fast rinse drain piston is open. If the
water tests hard then backwash drain
piston is open.
High Flow to Drain During
Service
Check position dial pilot. If not in Position #1, manually cycle
the pilot drive assembly to Position #1.
If the flow stops, check the pilot drive
assembly.
Use a test kit and check the hardness of
the water at the drain.
Use a test kit and check the hardness
of the water at the drain. If soft then fast
rinse drain piston is open. If the water
tests hard then backwash drain piston is
open.
Check the feed water pressure Water pressure is less than 35 psi.
Piston Does Not Close or Open.
CAUTION: make certain that
the water pressure is relieved
from the system before remov-
ing the spool manifold.
Turn off the water pressure, remove
spool manifold, then remove piston from
control valve.
If there is no flow from the tubing, the pi-
lot strainer may be plugged.
• T-Seal may be dirty, worn or loose.
• Seat may be eroded.
• Upper piston o-ring may be torn.
Piston Does Not Open Turn off the water pressure, remove
clamp, remove external plumbing con-
nections then remove valve body from
tank adapter. Visually inspect T-Seal.
T-Seal may be fouled or swollen.
Unfiltered Water Leakage Into
the Service Lines.
CAUTION: make certain that
the water pressure is relieved
from the system before dissas-
sembling the control valve.
Inspect the bypass piston. If no flow from the tubing the pilot strain-
er is probably plugged.
• T-Seal may be dirty, worn or loose.
• Seat may be eroded.
• Upper piston o-ring may be torn.
Build-up on the inside of the valve cavity
may be preventing the piston assembly
from seating.
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