SENTRY II 940ST Series User Manual

40
Problem
Possible Cause
Solution
No display on Control Valve
Circuit Board
No power at electrical outlet Repair outlet or use working outlet
Control Valve Power Cord not plugged
onto Control Valve Circuit Board
Make sure Control Valve Power Cord is
connected securely at both ends
Defective Power Adapter Replace Power Adapter
Defective Circuit Board Replace Circuit Board
Control Valve Circuit Board
does not display correct time
of day
Control Valve Power Cord plugged into
electric outlet controlled by light switch
Use uninterrupted outlet
Tripped Breaker Switch and/or tripped GFI Reset Breaker Switch and/ or GFI switch
Power outage
Reset time of day. If Circuit Board has
battery back up present, the battery may
be depleted. Replace if necessary.
Defective Circuit Board Replace Circuit Board
Time of day flashes on and off Power outage
Reset time of day. If Circuit Board has
battery back up present, the Battery may
be depleted. Replace if necessary.
Control valve does not
regenerate automatically when
the REGEN button is
depressed and held.
Broken Drive Gear or Drive Cap Assembly
Replace Drive Gear or Drive Cap
Assembly
Broken Piston Rod
Replace Piston Rod
Defective PC Board Defective PC Board
Control valve does not
regenerate automatically but
does when the UP and DOWN
arrow buttons are depressed
and held.
Bypass Valve in bypass position
Turn Bypass Handles to place Bypass in
service position
Incorrect programming Check for programming error
Defective Circuit Board Replace Circuit Board
Hard or untreated water is
being delivered
Bypass Valve is open or faulty
Fully close Bypass Valve or replace. Also
check for multiple bypasses
Media is exhausted due to high water
usage
Check program settings or diagnostics for
abnormal water usage
Water quality fluctuation
Test water and adjust program values
accordingly
No Salt or low level of Salt in Brine Tank Add proper type of salt to Brine Tank
Control Valve fails to draw in brine
Refer to Trouble Shooting Guide “Control
Valve Fails to Draw Brine”
Insufficient brine level in Brine Tank
Check refill setting in programming. Check
Refill Flow Control for restrictions or debris
and clean or replace
Damaged Seal and Spacer Stack
Assembly
Replace Seal and Spacer Stack Assembly
Control valve body type and piston type
mix matched
Verify proper control valve body type and
piston type match
Fouled media bed Replace media bed
System uses too much salt
Improper refill setting Check refill setting
Improper program settings
Check program setting to make sure they
are specific to the water quality and
application needs
Control valve regenerates frequently
Check for leaking fixtures that may be
exhausting capacity or system is
undersized
Slow drip from brine refill tubing. Float
Valve is not designed to shut off a drip
Replace Seal and Spacer Stack Assembly
Control Valve Trouble Shooting

SENTRY II 940ST Series Specifications

General

Brand	SENTRY II
Model	940ST Series
Category	Water Dispenser
Language	English