Mitsubishi Electric Lossnay LGH-50RVS-E Handbook page 18

No. Problem
6 Even though the
remote controller is
operated to change
the fan speed, the
fan speed does not
change.
7 The fan operation is
unstable.
8 Air volume is abnor-
mally large or small.
9 The damper does
not operate even
though the trial
operation switch
(SW2-1) on the cir-
cuit board is turned
ON.
Factor
The indoor negative pressure
setting or the indoor positive
pressure setting is set.
The external fan speed input is
set. (CN17)
The external fan speed input is
set. (CN26)
The system is operating in the
protective mode (intermittent
operation).
Airflow setting is performed
with PZ-62DR-E.
The motor rotation speed is
under control.
The model selection switch
(SW6) is not set correctly after
the circuit board is replaced.
The connector between the
damper motor and circuit
board is disconnected.
Mechanical failure
Damper motor failure
Circuit board failure
Poor connection of the con-
nectors (CN14, CN113)
Check the function selection switches (SW2-4 and
SW2-5) on the circuit board or the function settings
(No. 6 and 7) of PZ-62DR-E.
(See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
When PZ-62DR-E is used, it displays the icon "
Check the fan speed switching input (CN17).
When PZ-62DR-E is used, it displays the icon "
Check the function selection switches (SW5-6,
SW5-7, and SW5-8) on the circuit board or the
function setting (No. 66) of PZ-62DR-E.
(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 protective operation is in-progress.
For details, see the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.
Check the "Airflow" screen or the function settings
(No. 73 to 78, 87, and 88) of PZ-62DR-E.
(See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
This product controls the motor by detecting the
motor rotation speed. The fan operation may be
unstable during rotation speed control (for maxi-
mum about 10 minutes).
Make the SW6 setting appropriate for the model.
( See Chapter 7. (9) Setting status record (page
47).)
Check the connection of the connector (CN12) on
the power circuit board.
Remove the rod of the damper board, and check
that the damper board can be moved by hand.
If the damper board cannot be moved, check for
obstacles that are obstructing the movement of the
damper board.
Remove the rod of the damper board and turn the
trial operation switch (SW2-1) ON.
The damper motor operates in about 30 seconds.
If the damper motor does not operate, replace the
damper motor (GM assembly).
Disconnect the connector (CN12) from the power
circuit board and check the voltage value between
the pins of CN12 when the trial operation switch
(SW2-1) is turned ON.
If there is no voltage value, replace the power cir-
cuit board.
If the problem persists, replace the damper motor
(GM assembly).
Check the connector connections.
Control circuit board: CN14
Power circuit board: CN113
─ 18 ─
Corrective action
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