Maytag M-550 Operation And Service Manual page 14

Problem
High Total Dissolved Solids (TDS) in the
Product Water (continued).
Tastes and odors in the Product Water
Drain Water overflows at the Dispensing
Faucet
Faucet leaks or drips
Fitting leaks in general
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14
Possible Cause
The Product Water and Drain Water lines
are reversed.
No drain flow, Drain Restrictor is clogged.
No drain flow, the drain orifice in the
Dispensing Faucet is plugged.
The ASO Valve is not closing.
New In-Line Post Filter or Activated
Carbon Module not rinsed completely.
The Feed Water TDS has increased.
The In-Line Post Filter or Activated
Carbon Module is exhausted.
There is foreign matter in the Holding
Tank.
The Product Water and Drain Water lines
are reversed.
Dissolved gases in the Feed Water.
Increase in Product Water TDS.
Air Gap is blocked.
Drain tubing is clogged.
Drain Clamp hole is misaligned.
Excessive drain flow rate.
Leaks from base of the delivery tube.
Close the Feed Water Valve and relieve pressure before disconnecting any tubing or
replacing any fitting.
Before replacing a fitting, re-cut the tubing and re-insert into the fitting to see if that solves
the leak.
If pipe threads are leaking, remove and re-tape with Teflon tape.
Solution
Correct plumbing.
Clear or replace Drain Restrictor.
Clear or replace Dispensing Faucet.
Repair or replace the ASO Valve Components.
Flush with several full tanks of Product Water.
An increase in Feed Water TDS will give a
corresponding increase in Product Water
TDS.
Replace Filters.
Clean, flush and sanitize the system.
Replace the filters.
Correct plumbing.
Pre-treat Feed Water to remove dissolved
gases.
See high TDS in the Product Water section.
Clear air gap.
Rinse with vinegar for removal of calcium
buildup.
Clear tubing.
Align with hole in the drain pipe.
Replace Drain Restrictor.
O-ring is bad, replace O-ring.