Mitsubishi Electric PURY-P200 Service Handbook page 157

City multi r410a
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Phenomena
3
"HO" display on remote
controller does not disappear
and ON/OFF switch is
ineffective.
Check method & Handling
In case MELANS is not used
Same symptom for all
units in a single
refrigerant system?
YES
Check outdoor unit
address
51 ~ 100?
YES
Check centralized
control switch SW2-1 at
outdoor unit
ON?
NO
Faulty outdoor unit
control circuit board
In case with MELANS used
When MELANS is used, "HO" display on the remote controller will disappear at the group registration of the indoor unit and local remote controller.
If "HO" does not disappear after the registration, check the items (11) ~ (13) in the Factors column.
Factors
(Without using MELANS)
(1) Outdoor unit address is set to "00"
(2) Erroneous address.
1 Address setting of indoor unit to be coupled with remote controller incorrect.
(Indoor unit = remote controller – 100.)
2 Address setting of remote controller incorrect.
(Remote controller = indoor unit + 100.)
(3) Faulty wiring of transmission terminal block TB5 of indoor unit in the same
group with remote controller.
(4) Centralized control SW2-1 of outdoor unit is turned ON.
(5) Disconnection or faulty wiring of indoor unit transmission line.
(6) Disconnection between indoor unit M-NET transmission line terminal block
(TB5) and connector CN2M.
(7) More than 2 sets of power supply connector (CN40) are inserted into
centralized control transmission line of outdoor unit.
(8) M-NET remote controller is connected to the terminal block of MA remote
controller.
(9) Faulty outdoor unit control circuit board.
(10) Faulty indoor controller board.
(11) Faulty remote controller.
(Interlocking control with MELANS)
(12) No grouping registration from MELANS (Neglecting to set the relation
between indoor unit and network remote controller).
(13) Disconnection of centralized control transmission line (TB7) at outdoor unit.
(14) Power supply connectors (CN40) of Multiple outdoor units are inserted into
transmission lines.
Or in the system to which power supply unit for transmission line, power
supply of the outdoor unit (CN40) is inserted into transmission line.
NO
NO
Outdoor unit
address setting
miss
Switch setting
YES
miss
Change from
ON to OFF
indoor unit M-NET
Repair spot
in trouble
- 154 -
Confirm address of remote
controller with "HO" displayed
Address setting
NO
Indoor unit + 100?
miss of remote
controller
Check address of
coupling indoor unit
Indoor address
NO
Remote controller
setting miss
Check voltage of indoor unit M-NET
transmission terminal block
Transmission line
wiring miss of
NO
Check connection between indoor
unit M-NET transmission terminal
block (TB5) and connector CN2M
Disconnection
YES
of CN2M
connector
Faulty indoor controller board
or remote controller
YES
-100?
YES
17 ~ 30V?
YES
Disconnection
NO

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