ASI Dental Specialties
7 – TROUBLESHOOTING
www.asisupport.com
Page 2
65-0057 Rev-A (11/12/20)
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The handpiece quick connect coupler or swivel coupler may be clogged and not allowing the air to
exhaust from the handpiece. Remove the coupler from the tubing and try a different coupler. Another
way to test a bad coupler is to move it to a different tubing that previously worked fine. Does the
problem exist with the coupler on a different tubing? If so, replace or repair the coupler by following the
coupler manufacturer’s recommendation.
Air or Water Coming out of Handpieces When Hung Up
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Diaphragm(s) in the control block are worn or have holes from improper water line disinfection
chemicals, over pressurized air supply or over five years old. Replace the diaphragm(s).
o
Order ASI PN 95-0215,
Control Block Diaphragm Pucks Full Set
and refer to the applicable
technical guideline (located on ASIsupport.com) for more information.
Water Filling Up Oil Mist Recovery Jar
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Bad gasket on handpiece or coupler is not tight or is misthreaded. Remove handpiece coupler, verify
gasket and firmly re-tighten.
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Water condensation from main air compressor is in the air lines. Check central compressor.
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If the diaphragm pucks have recently been replaced, and the jar is overflowing with water, the pucks
may be upside down in the control block. Open the control block and verify that the ridged side of the
diaphragm puck is facing down.
Water Not Flowing From Handpieces or Air/Water Syringe
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Check the water bottles and ensure they are full, switched on and that the air pressure gauge is reading
around 25-35psi.
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If the pressure is below 25 psi, then the check valve needs to be replaced.
o
Order ASI PN 95-0216,
Mini-Inline Regulator, 35psi, 1/16” Barbs
and refer to the applicable
technical guideline (located on ASIsupport.com) for more information.
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Air leak in pickup tube or cartridge not secure onto pickup tube. Secure or replace tubing if necessary.
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Bottle threads worn and not sealing correctly. Replace bottles annually or sooner if necessary.
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Blocked or pinched tubing. Make sure tubing is not pinched. If tubes are not pinched, inspect for
blockage.
Water Flows from Air/Water Syringe but not Handpieces
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Pinched water line.
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Check to see if water is not flowing from any handpiece to determine if it is isolated to just one tubing.
Ensure that all the flow control valves for water have been opened.
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Check the water on/off toggle located either on the foot control or on the delivery system to see if it is
working. Remove the cover on the foot pedal from the toggle to see if the signal line could be kinked.
Remove the gray air signal line from the relay and activate the foot pedal and ensure that an air stream
is coming out.
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Press straight down on the water on/off toggle and activate. If water flow resumes, replace toggle
tower assembly if defective.
65-OS01 Rev-A | 11/12/20
