Watts ZRO-4, Installation, Operation And Maintenance Manual

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Trouble shooting
Problem Cause Solution
Low/slow production Excessive air pressure in tank Relieve pressure at schrader valve on tank (set
to 7 psi with the tank empty)
Pump not operating Wiring connection broken (plug 110 AC wall
plug back in at wall and/or reconnect the 24
VAC wire harness connectors)
Replace pump if needed
Fouled membrane Replace membrane
Plugged pre-filters Replace filters
Crimped tubing Check tubes to make sure they are not kinked
Angle stop or water line valve Ensure valves are opened by turning valve
not fully opened handle counter clockwise until it stops
Milky colored water Air in the system Air in the system is a normal occurrence with
initial start up of the RO system. This milky look
will disappear during normal use within 1-2
weeks. If condition reoccurs after filter changes,
drain tank 1 to 2 times.
Faucet Dripping Needs adjustment see page 12
Pump short cycles Ball valve on tank closed Open the ball valve on the top of the tank
Blue tube blocked between Remove kinked/damaged section and replace if
the tank and RO system necessary
Faulty pressure switch Call for technical support
Bowl leaks at the top after Damaged/Dry O-ring Lubricate with water soluble lubricant or replace
changing the filters O-ring as necessary (Do not use Vaseline or
other petroleum based lubricants)
Pump constantly running Electrical fault Call for technical support
Faucet left on Close faucet and let tank fill for 2 to 3 hours
Plugged pre-filters Replace filters
12
Once all water in the tank is purged, check air pressure using an air pressure gauge, it
should read between 5 - 7 PSI. (Digital air pressure gauge is recommended)
Check Air Pressure in the Tank
Important:
Step 3
Check air pressure only when tank is empty of water!
Step 1
Turn off the incoming cold water supply to the RO at the adapt-a-valve
clockwise until it stops. (Follow the green tube away from the RO
system to find the adapt-a-valve.)
Open the RO Faucet and allow water to drain from the tank until it is
completely empty.
Step 2
Check air pressure in the storage tank when you notice a decrease in available water from
the RO system. Air can be added with a bicycle pump using the schrader valve that is
located on the lower side of the tank behind a blue plastic cap.
Tip:
When water from the RO faucet slows to a trickle, with the faucet still in the open
position, you may add air to the tank to purge any left over water, this will ensure that
the tank is completely empty.