15
TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE
WHAT TO DO
Motor doesn’t start or doesn’t restart
Voltage drop or electric supply is out
Check the installation and/or wait for the electric supply
stabilization
Damaged motor
Contact your local authorized dealer for Sierra Dental
Products, LLC
Thermal protector went off
Motor will re-start as soon as temperature decreases. If
this continues to happen, contact your local authorized
dealer for Sierra Dental Products, LLC
Tank is full of air
Motor will re-start as soon as pressure in the tank
decreases to 85 psig
Check valve does not seal because of impurities
Contact your local authorized dealer for Sierra Dental
Products, LLC
Reduced air production (pressure
gauge keeps showing a lower
pressure than that of the job)
The demand is above the compressor’s capacity
Evaluate the compressor’s capacity, if necessary to
verify
Filter element is clogged
Replace filter element(s)
Air leakage in the compressor
Re-fasten bolts and/or fittings (See Table 3)
The compressor unit overheats
High ambient temperature (MAX 104 degrees
Fahrenheit)
Improve installation conditions (climate control,
ventilation, etc
…)
Incorrect rotation direction (counter-clockwise)
Contact your local authorized dealer for Sierra Dental
Products, LLC
Demand above compressor’s capacity
Evaluate the compressor’s capacity, if necessary to
verify
Filter element is clogged
Replace filter element(s)
Premature wear of the compressor
unit internal components
Operating in a non-adequate environment
Improve local conditions and/or contact your local
authorized dealer for Sierra Dental Products, LLC
Abnormal noise or vibrations
Loose fastening elements
Find and re-fasten them
Loose fan
Re-fasten it
Compressor installed incorrectly
Contact your local authorized dealer for Sierra Dental
Products, LLC
Damaged connecting rod(s) bearing and rings
See Preventative Maintenance Section
Motor overheats
Deficient or inadequate electric power supply
Consult a specialized electrician to check the power
supply
Tank’s pressure goes up too fast or
many frequent starts (the normal
number of starts is roughly 6/hr)
Water excess in the tank
Drain the tank with the petcock
High temperature of the compressor
unit
Too much dust on the pump
Clean it externally
High ambient temperature (MAX 104 degrees
Fahrenheit)
Improve installation conditions (climate control,
ventilation, etc.)
Filter element is clogged
Replace filter element(s)
Compressor operates uninterruptedly
The system’s demand is above compressor’s capacity
Evaluate and verify the compressor’s stated capacity
Insufficient pressure for the job
Pressure regulator is not adjusted
Contact your local authorized dealer for Sierra Dental
Products, LLC to adjust it
