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11/6/2018
© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Water Flow Servo (WFSV) Valve Removal
Ensure unit is isolated from water & power. Bleed water
pressure from system.
1. Remove (1) screw from WFSV valve housing. Rotate retainer
to release outlet water line. Pull copper line away from WFSV.
2. Remove stainless steel clip stamped 10-17 holding PRV line in
place. Pull line loose from bypass valve.
3. Unplug WFSV control valve seven wire connector (white, pink,
blue, red, grey, brown and orange wires).
4. Remove one screw holding ceramic anti-frost heater in place,
pull heater element out of WFSV body.
5. Remove stainless steel clip stamped 16-B from bypass valve.
Pull WFSV out of water heater.
6. Replace all O-rings before reassembling WFSV.
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