Toshiba MMW-AP0481CHQ-E Service Manual page 52

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
A27 — —
A28 — —
E01 — —
E02 — —
E03 — —
E04 — —
No. of indoor units from
which signal is received
normally
E06 E06
— E07 —
Duplicated indoor
address
E08 E08
E09 — —
Location
Description
of
detection
Indoor unit High-pressure
(H-HWM) protective
operation
Indoor unit H-HWM
(H-HWM) communication
trouble between
I/F and IPDU.
Remote Indoor-remote
controller controller
communication
trouble
(detected at
remote
controller end)
Remote Remote
controller controller
transmission
trouble
Indoor unit Indoor-remote
controller
communication
trouble
(detected at
indoor end)
Indoor unit Indoor-outdoor
communication
circuit trouble
(detected at
indoor end)
I/F Signal lack of
indoor unit
I/F Indoor-outdoor
communication
circuit trouble
(detected at
outdoor end)
Indoor unit I/F Duplicated
indoor address
Remote Duplicated
controller master remote
controller
Check code detection
System status
condition(s)
Stop of PD sensor detect
corresponding pressuere is higher than
unit the specified value.
Stop of Communication
corresponding interrupted between
unit H-HWM P.C. board (I/F)
and H-HWM P.C. board
(IPDU).
Stop of Communication between
corresponding indoor P.C. board and
unit remote controller is
disrupted.
Stop of Signal cannot be
corresponding transmitted from remote
unit controller to indoor unit.
Stop of There is no
corresponding communication from
unit remote controller
Stop of Indoor unit is not
corresponding receiving signal from
unit outdoor unit.
All stop Indoor unit initially
communicating normally
fails to return signal for
specified length of time.
All stop Signal cannot be
transmitted from outdoor
to indoor units for 30
seconds continuously.
All stop More than one indoor
unit are assigned same
address.
Stop of In two remote controller
corresponding configuration both
unit controllers are set up as
master.
(Header indoor unit is
shut down with alarm,
while follower indoor
units continue operating.)
– 52 –
Check items (locations)
• Check PD pressure sensor trouble.
• Check clogging of PMV 2.
• Check clogging of heat exchangers.
• Check H-HWM P.C. board (I/F)
trouble.
• Check refrigerant overcharge
(R134a).
• Check H-HWM P.C. board (I/F)
trouble.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check remote controller inter-unit
tie cable (A/B).
• Check for broken wire or connector
bad contact.
• Check indoor power supply.
• Check for trouble in indoor P.C.
board.
• Check remote controller address
settings (when two remote
controllers are in use).
• Check remote controller P.C. board.
• Check internal transmission
circuit of remote controller.
--- Replace remote controller as
necessary.
• Check remote controller wiring.
• Check order in which power was
turned on for indoor and outdoor
units.
• Check indoor address setting.
• Check indoor-outdoor wiring.
• Check outdoor terminator resistor
setting (SW30, Bit 2).
• Check power supply to indoor unit.
(Is power turned on?)
• Check connection of indoor-
outdoor communication cable.
• Check connection of
communication connectors on
indoor P.C. board.
• Check connection of
communication connectors on
outdoor P.C. board.
• Check for trouble in indoor P.C.
board.
• Check for trouble in outdoor P.C.
board (I/F).
• Check outdoor terminator resistor
setting (SW30, Bit 2).
• Check connection of indoor-
outdoor communication circuit.
• Check indoor addresses.
• Check for any change made to
remote controller connection
(group/ individual) since indoor
address setting.
• Check remote controller settings.
• Check remote controller P.C. boards.