Mitsubishi Electric LGH-250RVXT-E Handbook page 21

Individual check items
If the system cannot be started/stopped using the remote controller after installation is completed, check the
following items.
1 PZ-61DR-E
No. Problem
1 Some Lossnay units
in the group do not
operate.
2 The screen display
of the remote con-
troller changes by
itself. Even if you
press the buttons,
the screen returns
to the original
screen right away.
3 The ventilation
mode cannot be
changed with the
remote controller.
4 Even though the
function settings (No.
37 and/or 38) of PZ-
61DR-E are set to
"1", the indoor tem-
perature and/or sup-
ply air temperature
are not displayed.
5 Even though the
function settings
(No. 36, 37 and/or
38) of PZ-61DR-E
are set to "1", the
outdoor tempera-
ture, indoor temper-
ature and/or supply
air temperature are
not displayed.
6 The indoor, outdoor,
and/or supply air
temperature display
of PZ-61DR-E blink.
Factor
The power of the Lossnay unit is
not ON.
Faulty connection of the remote
controller transmission cable
The remote controller transmission
cables are not correctly connected
between the terminals (TM4 12)
of the Lossnay units in the group.
The system is operating in the
protective mode (intermittent
operation).
Faulty connection of the remote
controller transmission cable
The group wiring and the group
setting of the system controller do
not match.
When the system controller is
used, the Lossnay unit, which is
set as the main Lossnay (SW5-10
ON), is not set to the address with
the smallest number in the group.
The Lossnay unit is performing
the Night-purge operation.
The signal is input to the Bypass
mode switching input (CN26
12).
The Lossnay unit is performing
the Bypass mode ventilation.
The setting of PZ-61DR-E is not
correct.
The indoor, outdoor, and/or supply
air temperature are outside the
measurement range.
Check the items described in (1) 1.
Check the items described in (1) 2.
Connect the remote controller transmission
cables correctly between the terminals (TM4
1 2) of the Lossnay units in the group.
For details, see the Lossnay technical manual.
Check the items described in (1) 2.
Check the group wiring or the group setting of
the system controller.
Set the Lossnay unit, which is set as the main
Lossnay (SW5-10 ON) to the address with the
smallest number.
(See the Lossnay technical manual.)
The ventilation mode cannot be changed during
the Night-purge operation. (See the Lossnay
technical manual.)
Check the Bypass mode switching input (CN26
12). (See the Lossnay technical manual.)
The indoor temperature and/or supply air tem-
perature are not displayed during the Bypass
mode.
Select "Yes" at "Temp. display" menu of PZ-
61DR-E. For details, see the installation manual
of PZ-61DR-E.
In the following cases, the temperature display
blinks.
Outdoor temperature:
0°C or lower, 38°C or higher
Indoor and supply air temperature:
8°C or lower, 38°C or higher
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Corrective action