Problem
Possible Cause
Solution
No Water Pro-
duction
*
No Water Supply
Ensure water supply is turned on
Insu
ffi
cient Pressure
Use booster pump if pressure is <40psi
GAC Filter Upside Down
Single gasket needs to be facing up
Clogged
fi
lters Replace
fi
lters
Fouled Membrane
Replace membrane
Defective Check Valve
Replace check valve
Defective Auto Shut O
ff
Replace auto shut o
ff
valve
Defective Flow Restrictor Replace
fl
ow restrictor
Obstruction In Line
Ensure valves open & no kinks in lines
Trace
fl
ow of water to pinpoint cause
Waste Water
Runs Constant-
ly
**
Insu
ffi
cient Pressure
Use booster pump if pressure is <40psi
Clogged
fi
lters Replace
fi
lters
Fouled Membrane
Replace membrane
Defective Check Valve
Replace Check Valve
Defective Auto Shut O
ff
Replace auto shut o
ff
valve
Defective Flow Restrictor Replace
fl
ow restrictor
Obstruction In Line
Ensure valves open & no kinks in lines
Trace
fl
ow of water
Tank Not Hold-
ing Water***
No Pressure in Tank
Check pressure in tank, min. pressure
4psi, max. pressure 10psi,
with tank
empty.
Defective Check Valve
Replace check valve
*
Water output will decrease as the tank empties and will only be a quick drip or slow
stream when the tank is empty. This is normal.
**
Water will run down the drain whenever the system is
fi
lling the tank. How long it
runs depends on water pressure,
fi
lter and membrane condition, membrane size,
system con
fi
guration, and amount of water taken from the tank. Average times for
re
fi
lling the tank range from 30-45 minutes for a couple glasses of water up to 4-5
hours to completely
fi
ll the tank.
***
The standard tank will hold a maximum of about 3.2 gallons of water, the up-
grade tank will hold about a maximum of about 10.3 gallons of water. Actual storage
capacity may be less depending on system con
fi
guration and water pressure.
Troubleshooting
Note: To remove tubing from quick connect
fi
ttings, hold in on the small col-
let ring at the end of the
fi
tting, push this ring in towards the
fi
tting while
gently pulling out on the tubing. This releases the tubing from the
fi
tting and
it will slide out easily
Quick Troubleshooting Guide
Zoi Series
Mu Pure System
Reverse Osmosis Water Filtration System
Replacement Filter Set
DFK-Mu
Typical Filter Life: 6-12 Months
Replacement Membrane
RF-MB-50F*
Typical Membrane Life: 2-4 Years
*Typical membrane used in most systems. Upgraded systems
may require a di
ff
erent membrane
www.afw
fi
lters.com
