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Failure Diagnosis - Toshiba VN-M150HE Service Manual

Air to air heat exchanger concealed microcomputer control type
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9

Failure Diagnosis

9-1. Failure Diagnosis
9-1-1. Before diagnosing failure
Symptom
Operation does not start after pressing
the button.
• Air does not come out.
• The sound is loud.
The unit runs though the operation lamp
does not turn on.
The unit starts running without any
operation of the remote controller.
9-1-2. How to diagnose failure
Situation
Where to check
Displayed on the remote controller...Depends on the check code.
Displayed on the central controller...Depends on the check code.
• Lead wire
• Connection
The motor
• Motor
does not run.
• Fan rotation
• Capacitor
• Motor
• Fan
An abnormal
sound is heard
from the
• Screws
inside.
• Filter
• Heat exchange
element
• Capacitor
The motor is
not running
fast enough.
• Motor
• Lead wire
• Damper motor
The damper
does not open
• Damper
or close.
• Connector
assembly
• Is the circuit breaker turned off?
• Has a power failure occurred?
• Does the
indicator light up?
(The ventilation delay setting is set to CODE No. [49] "ON" and it is not
malfunction. The Air to Air Heat Exchanger will start running after the time set has
passed.)
Are the filters or heat exchange elements clogged? For maintenance, see page
134.
Does the
or
The nighttime heat purge operation or 24-hour ventilation is set to CODE No. [4C]
[49] "ON". See page 80 for how to use the functions.
Has the unit just recovered from a power failure or have you just turned on the
circuit breaker?
(The settings concerning recovering from power failure or start/stop by power on/
off are set to CODE No. [28] [9D] "ON". Consult your dealer for details.)
Cause
The circuit is open.
A connection is loose.
The motor bearing is locked.
The motor coil or temperature fuse is broken.
The fan is not rotating.
The capacitor is not working properly.
Electromagnetic sound (the motor is buzzing).
The bearing is in poor condition.
The fan has not been installed properly.
A foreign object has been taken in.
The fan has been deformed.
A screw(s) is/are loose (not tightened
completely).
The filter is clogged.
The heat exchange element is clogged.
The capacitor is not working properly.
The motor bearing is not running smoothly.
A connection is loose.
The coil of the damper motor is broken.
Something is caught on the sliding part.
A connection is loose.
44
Cause
indicator appear on the display?
• Replace the motor with a new one.
• Connect firmly.
• (Electric board, Motor connector)
• Replace the motor with a new one.
• Remove any obstacles.
• Replace the capacitor with a new
one.
• Replace the motor with a new one.
• Install the fan securely.
• Remove the foreign object.
• Replace the fan with a new one.
• Tighten the screws firmly.
• Clean the filter.
• Clean the heat exchange element.
• Replace the capacitor with a new
one.
• Replace the motor with a new one.
• Connect firmly.
• Replace the damper motor with a
new one.
• Remove whatever is caught.
• Replace the assembled connector
with a new one.
Remedy

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