Mitsubishi Electric Lossnay LGH-50RVS-E Handbook page 16

Individual function check items
[6] If Lossnay does not work in the trial operation, or if Lossnay stops working during use, check the following
items.
No. Problem
1 The fan does not
operate even
though the trial
operation switch
(SW2-1) on the cir-
cuit board is turned
ON.
2 Though the remote
controller display
indicates the fan
is running, the fan
stops by itself.
Factor
The connectors between the
fan motor and circuit board are
disconnected.
The connectors between the
control circuit board and power
circuit board are disconnected.
Fan motor failure
Circuit board failure
Power with the rated voltage is
not supplied to the product.
The Lossnay unit is operating
in the protective mode (inter-
mittent operation).
The Lossnay unit is set to the
delay operation.
The interlocked air conditioner
(Mr. Slim indoor unit or City
Multi indoor unit) is stopped
due to defrosting.
The ventilation switching
damper is operating.
Check the connector (CN9) for the exhaust fan
motor and the connector (CN10) for the supply fan
motor.
* Before connecting or disconnecting the motor con-
nectors (CN9, CN10), turn off the power supply
isolator, and check that the all LEDs on the circuit
board are not lit.
Check the connector connections.
Control circuit board: CN14, CN19
Power circuit board: CN114, CN119
If the fan can be turned manually, replace the DC
motor of the fan.
Check the resistance between the motor leads.
(See (6) Motor resistance table (page 34).)
If the measured value is significantly different from
the values specified in the table, replace the DC
motor of the fan.
If LED6 located between CN9 and CN10 on the
power circuit board is not lit, check power supply
to TAB1 and TAB2. If no error is found with power
supply, replace the power circuit board.
If the problem persists, replace the DC motor of the
fan.
Check the power supply voltage.
When PZ-62DR-E is used, it displays the icon "
that indicates the protective operation is in-progress.
For details, see the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.
When PZ-62DR-E is used, it displays the icon "
that indicates the delay operation is in-progress.
When PZ-43SMF-E is used, it displays the icon
" " and the timer duration.
LED1 (green) on the control circuit board lights.
Lossnay operates in 30 minutes (or 15 minutes)
after the interlocked air conditioner is operated to
run.
Check the function selection switch (SW2-3) on
the circuit board or the function setting (No. 9) of
PZ-62DR-E.
The supply fan has been stopped to prevent cold
air from blowing out. When the air conditioner starts
operating, the fan operation is started automatically.
The fan stops while the ventilation switching
damper is operating.
Also, the fan may stop temporarily to check the
damper operation regularly.
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Corrective action
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