Check Codes Displayed On Remote Controller And Smms-U Outdoor Unit (7-Segment Display On I/F Board) And Locations To Be Checked - Toshiba MMW-UP0271LQ-E Service Manual

9-4. Check Codes Displayed on Remote Controller and SMMS-u Outdoor Unit
(7-Segment Display on I/F Board) and Locations to Be Checked
For other types of outdoor units, refer to their own service manuals.
Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
Detected indoor
unit No.
A01 A01
Detected indoor
unit No.
A02 A02
Detected indoor
unit No.
A04 A04
E01 — —
E02 — —
E03 — —
E04 — —
Location
Description
of
detection
Indoor unit Flow switch
(M-HWM) operation
trouble
Indoor unit Water
(M-HWM) temperature
decrease
trouble
Indoor unit Activation of
(M-HWM) water heat
exchanger frost
protection
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)
Indoor unit (including Hot Water Module)
Check code detection
System status
condition(s)
All stop When water flow rate is
reduced.
All stop Water temperature
continued the low status
regardless of that the
water-heater and water
pump is operating.
All stop Frost protection for water
heat exchanger is activated.
Stop of Communication between
corresponding indoor P.C. board and
unit remote controller is
disrupted.
Stop of Signal cannot be transmitted
corresponding from remote controller to
unit indoor unit.
Stop of There is no communication
corresponding from remote controller
unit (including wireless) or
network adaptor.
Stop of Indoor unit is not receiving
corresponding signal from outdoor unit.
unit
– 54 –
Check items (locations)
• Check the pump.
• Check the strainer.
• Check the flow switch.
(Type, directtion of
attachment and point of
contact)
• Check the water
temperature.
• Check the heat insulator of
water pipes.
• Check the line heater
• Check the PMV coil and
PMV.
• Check the 2-way valve coil
and 2-way valve.
• Check remote controller
inter-unit tie cable (A/B).
• Check for broken wire or
connector bad contact.
• Check indoor power
supply.
• Check for failure 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
and network adaptor
wiring.
• Check order in which
power was turned on for
indoor and outdoor units.
• Check indoor address
setting.
• Check indoor-outdoor tie
cable.
• Check outdoor terminator
resistor setting (SW100,
Bit 2).