Troubleshooting 57
Cat. No. 01029343
PROBLEM OR SYMPTOM CHECK PROCEDURE CAUSE
Restricted or No Service Flow Either Service Inlet piston or Service
Outlet piston are not opening fully. To
determine which one, turn the pilot to po-
sition #2. Observe the flow to the drain.
Cycle the pilot to position #4 and com-
pare the flow of water in position #4 to
the flow in position #2. Return the pilot to
position #1.
Flow should be the same for both posi-
tions but if not:
• Service Outlet piston is not opening
properly.
• If backwash (position #2) is high-
er, then Service Inlet piston is not
responding properly.
Potentially clogged distributors or com-
pacted media bed.
Failed distributors.
Contamination of resin bed.
Check feed water pressure Water pressure is less than 35 psi.
Restricted or No Drain Flow
During Backwash
Turn the pilot to position #2 and then to
position #4, comparing the rate of flow to
the drain. Return the pilot to position #1.
Flow should be the same. If not:
• If the flow in position #4 is low, see
Restricted or No Service Flow Check
Procedures and causes.
• Inlet water pressure may be low.
• Backwash flow control may be
plugged.
• If flow rate in position #4 is greater
than position #2 then Backwash Inlet
piston and Backwash Drain piston
are not functioning properly
Media to Service Check tank distribution system Broken lateral
Bad distributor.
Trace and examine the plumbing Unit is plumbed backwards
Media to Drain High flow of water to drain. Check/replace backwash flow control
washer(s).
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