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TROUBLESHOOTING GUIDE
AIR SUPPLY MALFUNCTION
1. Check to be sure all airdrops are working properly. They
should be bubbling evenly and forcefully. A septic (rotten egg)
odor could mean that the system is not getting enough air. If
the air system is not working, partially working or working very
little (slight bubbles), check the following:
a. Check to be sure the air pump is working.
• check timer if one is used
• bypass timer; temporarily connect directly to source
• check the electrical source
• if electrical source is OK – check service guide for
pump unit troubleshooting information
• wash air filter on pump
• consult manufacturer for servicing information
b. Check to be sure tank is not severely out of level. Air
follows a path of least resistance. The pressure differences
at the bottom of droplines can be enough to prevent or
restrict air flow.
c. Check for broken or cracked air lines both outside and
inside the tank.
d. Ants will destroy an air pump. Check to see if there is an
ant nest around the air pump.
e. Air pump should be protected from rising water.
f. Always check to see if inlet and outlet lines are correctly
installed.
INTERNAL ASSEMBLY MALFUNCTION
1. Improperly installed or loose seals and/or gaskets where the
pipe goes through the clarifier wall can allow raw, untreated
sewage from the aeration chamber (bubble zone) to enter
the clarifier (quiet zone). Check the size of holes to be sure
that there is no clearance for matter to pass through the wall
around the piping.
2. Check to be sure all internal piping and connections are tight.
DESIGN OVERLOAD
1. The system could be hydraulically overloaded (there is too
much water going through the system for the size of the
system).
2. The system could be biologically overloaded (there is too
much waste for the size of the system).
NO HARSH CHEMICALS SHOULD BE PUT IN THE SYSTEM
1. Water in the aeration chamber (bubble zone) should be the
color of chocolate milk. Blue or gray/blue water indicates
heavy use of detergents or other chemicals. If water appears
sudsy, there is too much detergent being used.
2. Water in the clarifier (quiet zone) should be clear, but scum
and debris may appear on the surface. Water is discharged
Delta Treatment Systems • 9125 Comar Drive, Walker, LA 70785 • 1-800-219-9183 • www.deltatreatment.com
into the discharge tee at a minimum of 6–8 inches below water
surface. You may not be able to see clear water by looking into
the tank. Samples must be taken at the sample port.
3. Oils and grease should be kept to a minimum. Grease tends
to form in white balls.
TROUBLSHOOTING ELECTRICAL SYSTEM
1. Air pump does not run:
a. Check main service for power.
b. Check and/or replace fuse with same rating as is in control
panel.
2. Alarm does not occur when air pump is off:
a. Malfunctioning pressure switch – replace.
b. Malfunctioning light or buzzer – replace.
3. Alarm occurs continuously even when air pump is running:
a. Air leak in main air system or air tubing to pressure switch –
repair leak or replace air line.
b. Malfunctioning pressure switch – replace.
c. High water level in tank – inspect for cause.
d. Short in float switch wire or float switches – repair or
replace.
Note: All replacement parts are available through your local
dealer.
CAUTION: Electrical shock or hazard may occur if unit is
not serviced properly. The manufacturer recommends that
a licensed electrician be called when electrical problems
occur.
COMPONENT REPLACEMENT PROCEDURE
• Air Pump: Follow the same procedure as outlined in the
"Installation Instructions."
• Float Switch: Remove Aerobic Treatment Plant's Riser or
24" cover. Locate float switch cable. Untie knot. Disconnect
float switch inside conduit box. Slip float switch cable
through rubber grommet into the plant. Replace with
exact replacement float switch. Reinstall by reversing the
procedure. Reconnect float switch wires using underground
rated compound filled wire nuts. See Float Switch Mounting
Details.
• Pressure Switch: Turn all power off to the control panel.
Remove back plate. Remove screws securing pressure switch
as well as connectors and tubing. Reverse procedure to install
new pressure switch.
• Buzzer: Turn all power off to the control panel. Remove screw
attaching the buzzer to back plate as well as connectors.
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