Troubleshooting guide – Ames Fire & Waterworks LFM500, LFM500N, LFM500Z Lead Free Stainless Steel Reduced Pressure Detector Assemblies User Manual
Page 7
7
Troubleshooting Guide
Difficulty
Possible Cause
Correction
#1 check is fouled
Remove and Clean #1 check
Relief valve discharges water
Relief valve does not properly close
Service relief valve
while system is not flowing
Municipal water pressure is fluctuating
Install check valve upstream
of backflow assembly
Fouled relief valve seat
Service relief valve
Relief valve does not
Incorrectly installed diaphragm
Remove diaphragm and
shut off properly
correctly install
Damaged rubber surface on piston
Replace with new piston
Damaged or plugged pressure hose
Repair or replace hose.
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