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Sand Filtration System (ST1100 & ST1600) Troubleshooting

sand filter system
Note: Disconnect the pump from the electrical outlet before performing any troubleshooting pump.
The Pump motor fails to start The Pump not plugged in OR the GFCI Power Cord Set not activated The GFCI Set must be plugged into a grounded power outlet. Then press the RESET button to start the Pump.
Low voltage Check and make sure the line voltage is between 105 AC and 125 AC.
The GFCI Power Cord Set and/or circuit breaker tripped Reset the circuit breaker. If problem persists, have the circuit checked by a qualified electrician.
The Pump motor is too hot, and the thermal safety switch shut it off Let the motor cool down and restart the Pump.
The Sand Filter doesn't clean the pool Inadequate chlorine or pH level A. Adjust Adjust the chlorine and pH levels. Consult your local pool supplies stores.
No sand in the Sand Tank Fill sand in as per SETUP INSTRUCTIONS (8)-(10) on p. 10-11
Wrong 6-Port Valve 10 setting Set the Valve Handle 20 to “FILTER” position.
The pool is too dirty Run the Pump longer.
Clogged Suction Fitting Clean the strainer of the Suction Fitting.
The Sand Filter doesn’t pump water, or the flow is very slow Clogged Suction Fitting or inlet of the Pump Clean the Suction Fitting and the Hose 13 connecting it to the Pump inlet.
An air leak on the intake Hose Check the Hose for damage; tighten the Hose Clamps 15, and check the pool water level.
The sand is too dirty Backwash the sand more frequently.
Crusting or caking of sand surface Replace about 1” (25mm) of the sand, or all the sand if problem persists.
A pool vacuuming device is attached to the Pump Remove the device.
The Pump doesn’t work Low water level Fill water up to the FILL LINE marked on the pool wall.
Clogged Suction Fitting strainer Clean the strainer.
An air leak on the intake Hose Check the Hose for damage; tighten the Hose Clamps 15 , and check the pool water level.
Faulty motor or the impeller is jammed Contact our Customer Service.
The 6-Port Valve 10 or its locking ring is leaking The 6-Port Valve O-Ring 9 is missing Remove the 6-Port Valve 10 and check to ensure the O-Ring is in place.
The 6-Port Valve O-Ring 9 is dirty Clean the O-Ring with garden hose water.
Loose Hose Clamps Tighten/reinstall the Clamps.
Faulty 6-Port Valve Contact our Customer Service.
Leakage at Hoses Loose Hose Clamps Tighten/reinstall the Clamps.
The O-Rings of Hose connections
are missing
Ensure that the O-Rings are in place and intact.
Pressure Gauge doesn’t work Clogged inlet of the Pressure Gauge Unscrew and remove the Gauge, then clear any obstructions in its inlet.
Faulty Pressure Gauge Contact our Customer Service.
Sand ended up in the pool The sand is too small for the Pump Use only #20 grade silica sand with particle size range 0.45-0.85 mm (0.018-0.033 inches) and uniformity coefficient less than 1.75
The sand bed is calcified Discard all the used sand and replace with new sand.


Useful Tips

Symptom 1: Water is leaking from the top of 6 port valve near the valve handle:

Check to see that the O-ring is inserted correctly on the inner lip of the 6-port valve cavity. This usually comes pre-assembled loosely.

Unscrew the dark grey threaded locking ring that is holding down the 6 Port Valve handle (#20) to the top of the 6 Port valve (#10). Please remove the ring entirely.

Lift the 6 port valve handle (lighter grey)(#20) up and out of the 6 port valve (darker grey) (#10).

Check that the large O-ring is seated properly inside the opening of the 6 port valve.

When replacing the 6 Port valve handle, please make sure that you properly align the notch on the handle portion (lighter grey), with the groove in the 6 Port Valve (darker grey). Check that it is seated correctly, as the notch will allow the handle to create a tight seal on top of the O-ring.

Once this is properly aligned and seated; thread the locking ring back over the 6 Port valve handle being careful not to cross thread the locking ring when tightening.

Place this entire 6 port Valve unit back on the Sand Filtration System tank, making sure the bottom Large O-ring is in place before you attach them together with the clamp.


Symptom 2: Pump will not start or stay on and may turn off suddenly on its own.

Hold down the button "test" If you have a GFCI for 30 seconds, then release the button. Press the reset button to start the pump.

Check another appliance or small device, such as a hair dryer. If that doesn't work, the problem is not with the pump and the client should reset their circuit breaker. If the problem persists, call an electrician to check the circuit.

Is the pump hot? Pumps are protected by thermal overload. If the pump gets too hot, the circuit opens and the pump will stop operating until it cools. Please check in the operating times here. For best results, run the pump at night when the temperature is lower.


Symptom 3: There is no water flow or slow water flow:

Check for obstructions at all sites of the hose. You can also look inside hose for debris.

Check to see as air can be trapped inside the hoses. Be sure to backwash the sand before using the pump to clean the pool water. Fix and inspect hoses to prevent captured air pockets.


Symptom 4: Pump is not cleaning the pool (Murky or green tinted water):

Make sure you have the valve set to "Filter" position. 

Ensure you have sufficient amount of sand in the canister. 

Check for obstructions at all sites of the hoses and strainer at the pool outlet fitting.

Use a chemical substance float device to release and ensure chemical are being released when the pump is not running. Apply to the pool on a regular basis.

Be sure to NOT use the swimming pool cover when the outside temperature too hot. The covered pool will become hot and will create algae.


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