6
Troubleshooting
O-ring, Inlet Coupler
Relief Valve Assembly
Closure Sleeve Test Cock with O-ring
Sleeve O-ring and Gasket
Service, Replacement Parts, and Maintenance
For repair kits and parts, refer to the Backflow
Prevention Products Repair Kits & Service Parts
price list PL-RP-BPD at www.watts.com.
Second Check Module
SYMPTOM
CAUSE
SOLUTION
Relief valve discharges water while system is not flowing
Check #1 is fouled
Remove and clean check #1
Relief valve does not properly close
Service relief valve
Municipal water pressure is fluctuating
Install check valve upstream of backflow assembly
Relief valve does not shut off properly
Fouled relief valve seat
Service relief valve
Incorrectly Installed diaphragm
Remove diaphragm and correctly install
Damaged rubber surface on piston
Replace with new piston
Damaged or plugged pressure hose
Replace or clear pressure hose
Check Module
O-ring
First Check Module
Relief Valve
Disc, Elastomer for tight shutoff
Closure Sleeve
E-clip
Spider Bushing
Spring
Piston Assembly
Screw, Cover
Body
Diaphragm
Cover Plate
Assembly
