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Is the connector connected
to pressure sensor
disconnected or
disassembled?

Reconnect or
repair
the connector.

Is the resistance of the
pressure sensor out of
range?
(pin 1~ pin 3)
(21~23 

Ω ±10%)

Replace the
pressure
switch.

Is the AIR CHAMBER and
the tube clogged?

Replace the MAIN PWB
assembly.

Fix the air
chamber
and remove
the foreign
material.

Is       

displayed?

8-5. TROUBLESHOOTING ELSE

1. Be careful of electric shock if disconnecting parts while troubleshooting.
2. First of all, check the connection of each electrical terminal with the wiring diagram.
3. If you replace the MAIN PWB ASSEMBLY, reinsert the connectors correctly.

Check the
fuse or reset
the circuit
breaker.

Is the current rating of
multi-outlet power strip
enough?
(Avoid connecting several
electric devices.)

Is the supplied voltage
120V AC?(+10%, -15%)

Alternate with
explanation.

Is the connector connected
to PCB/Noise filter
disconnected or
disassembled?

Reconnect
or repair
the connector.

Replace the
MAIN PWB
ASSEMBLY.

Is LED on while the power
is on?

Replace the
DISPLAY
PWB
ASSEMBLY.

Is five pin wire of
display PWB broken?