Mitsubishi Electric LGH-250RVXT-E Handbook page 17

No. Problem
3 The fan does not
stop even though
the remote control-
ler is operated to
stop operation.
4 Even though the
remote controller is
operated to change
the fan speed, the
fan speed does not
change.
5 The fan operation is
unstable.
6 Air volume is abnor-
mally large or small.
7 The damper does
not operate even
though the trial
operation switch
(SW2-1) on the cir-
cuit board is turned
ON.
Factor
The pre-heater or operation moni-
tor with delay operation is set to
be used.
The indoor negative pressure
setting or the indoor positive pres-
sure 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).
The pre-heater is ON.
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
If the pre-heater or operation monitor with delay
operation is set to be used, the fan continues op-
erating for three minutes after the stop operation.
Check the function selection switches (SW2-8
and 5-6) on the circuit board or the function set-
tings (No. 57 and 58) of PZ-61DR-E. (See the
Lossnay technical manual.)
Check the function selection switches (SW2-
4 and 2-5) on the circuit board or the function
settings (No. 6 and 7) of PZ-61DR-E. (See the
Lossnay technical manual.)
When PZ-61DR-E is used, it displays the icon " ".
Check the fan speed switching input (CN17).
When PZ-61DR-E is used, it displays the icon " ".
Check the function selection switches (SW2-3
and 2-6) on the circuit board or the function set-
ting (No. 63) of PZ-61DR-E. (See the Lossnay
technical manual.)
When PZ-61DR-E is used, it displays the icon
" " that indicates the protective operation is
in-progress.
For details, see the Lossnay technical manual
or remote controller manual.
When the pre-heater is ON, Lossnay runs at
Fan speed 2 or higher speed. Even when Fan
speed 1 is selected with the remote controller or
external fan speed input, Lossnay runs at Fan
speed 2.
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. (11) Setting status record (page
51).)
Check the connection of the connector (CN7) on
the power circuit board.
Remove the rod of the damper board and check
if the damper board can be moved by hand.
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 GM assembly.
Disconnect the connector (CN7) from the power
circuit board and check the voltage value be-
tween the pins of CN7 when the trial operation
switch (SW2-1) is turned ON.
(Voltage is output in about 30 seconds after
switch ON.)
If there is no voltage value, replace the circuit
board.
If the problem persists, replace the GM assem-
bly.
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Corrective action