SYMPTOM
Air compressor will not start.
Air compressor will not start,
but motor hums, then stops.
Air compressor does not stop
even though the maximum
pressure allowed has been
reached.
16
TROUBLESHOOTING
PROBABLE CAUSE
Power Cord not plugged in.
Motor/Pressure Switch turned "OFF".
Motor Thermal Overload tripped on
air compressor.
Circuit breaker tripped or fuse blown
at power source.
Lack of oil in the air compressor.
Extension cord is too small.
Motor voltage does not match power
source.
Air tank pressure achieved the "Max-
imum setting" or "Stop pressure" of
the Motor/Pressure Switch.
Pressure release valve on Motor/
Pressure Switch has not unloaded
pump head pressure.
Pilot valve's check valve stuck open.
Defective motor, or Motor/Pressure
Switch.
Extension cord too small.
Loose electrical connection.
Improper ventilation.
Oil weight too heavy.
Too many appliances being oper-
ated on same circuit.
Incorrect voltage, incorrect sized
circuit breaker, fuse or motor. De-
fective motor.
Defective Check Valve or Motor/
Pressure Switch.
Motor/Pressure Switch not operating
correctly.
REMEDY
Plug Power Cord into a grounded
outlet.
Move Motor/Pressure Switch to
"AUTO" position.
Turn unit off, wait 5 minutes, then
press Motor Thermal Overload until
click is heard.
Reset circuit breaker or replace fuse
if necessary, using only "Fusetron"
type T fuses.
Check for low voltage conditions.
Disconnect any other electrical ap-
pliances from circuit or operate air
compressor on its own branch circuit.
Add oil. (See page 9 or 11)
Use additional air hose instead of
extension cord, or use proper wire
gauge and cord length. (See page
12)
Contact Mi-T-M
Customer Service.
®
When Pilot Valve is set in the Start/
Stop position, motor will start au-
tomatically when air tank pressure
drops down to the "Cut-in" or "Start"
pressure of the Motor/Pressure
Switch.
Bleed the line by moving the switch
to the "Off" position.
Remove and clean or replace.
Contact Mi-T-M
Customer Service.
®
Use additional air hose instead of
extension cord, or use proper wire
gauge and cord length. (See page
12)
Contact qualified electrician.
Move unit to well ventilated area.
Use lighter weight oil. (See pg. 9 or
11)
Use another circuit or remove excess
appliances from circuit.
Contact qualified electrician.
Replace.
Replace.
Portable Electric Air Compressor Manual