Mitsubishi Electric LGH-15RVX3-E Handbook page 28

Individual check items
If the system cannot be started/stopped using the remote controller, check the following items.
[1] PZ-62DR-EA/EB
No. Problem
1 Some Lossnay units in
the group do not operate.
2 The screen display of
the remote controller
changes by itself.
Even if you press the but-
tons, the screen returns
to the original screen right
away.
3 The ventilation mode can-
not be changed with the
remote controller.
4 Even though the function
settings (No. 37 and/or
39) of PZ-62DR-EA/EB
are set to "1", the indoor
temperature and/or sup-
ply air temperature are
not displayed.
5 Even though the function
settings (No. 36, 37 and/
or 39) of PZ-62DR-EA/EB
are set to "1", the outdoor
temperature, indoor tem-
perature and/or supply
air temperature are not
displayed.
Factor
The power of the Lossnay unit
is not ON.
Faulty connection of the remote
controller transmission cable
The remote controller trans-
mission cables are not cor-
rectly connected between the
terminals (TM4 [1] [2]) 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, is
not set to the address with the
smallest number in the group,
or the address is duplicated.
The Lossnay unit is performing
the Night-purge operation.
The signal is input to the
Bypass mode switching input
(CN26 [1] [2]).
The Lossnay unit is performing
the Bypass mode ventilation.
The setting of PZ-62DR-EA/EB
is not correct.
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Corrective action
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 Operating/
Installation Instructions or PZ-62DR-E
Instruction Book.
Check the items described in (1) [2].
Check the group wiring or the group setting
of the system controller.
Lossnay unit with the smallest address
number in the group will be set as the main
Lossnay automatically.
Do not assign the same address number to
the other Lossnay units.
The ventilation mode cannot be changed dur-
ing the Night-purge operation.
(See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
Check the Bypass mode switching input
(CN26 [1] [2]).
(See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
The indoor temperature and/or supply air
temperature are not displayed during the
Bypass mode.
In addition, this function is available only
when "Sensor value" is set to "Yes" (Display)
by the remote controller PZ-62DR-EA/EB.
Select "Yes" at "Sensor value" menu of
PZ-62DR-EA/EB. For details, see the
Installation Manual of PZ-62DR-E.