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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.
Indoor unit (including Hot Water Module)
Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
• 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.
Remote
controller
Indoor-remote
controller
communication
trouble
(detected at
remote
controller end)
Stop of
corresponding
unit
Communication between
indoor P.C. board and
remote controller is
disrupted.
E01 — —
• Check internal
transmission circuit of
remote controller.
--- Replace remote
controller as necessary.
Remote
controller
Remote
controller
transmission
trouble
Stop of
corresponding
unit
Signal cannot be transmitted
from remote controller to
indoor unit.
E02 — —
• Check remote controller
and network adaptor
wiring.
Indoor unit Indoor-remote
controller
communication
trouble
(detected at
indoor end)
Stop of
corresponding
unit
There is no communication
from remote controller
(including wireless) or
network adaptor.
E03 — —
• Check the pump.
• Check the strainer.
• Check the flow switch.
(Type, directtion of
attachment and point of
contact)
Detected indoor
unit No.
Indoor unit
(M-HWM)
Flow switch
operation
trouble
All stop When water flow rate is
reduced.
A01 A01
• Check the water
temperature.
• Check the heat insulator of
water pipes.
Detected indoor
unit No.
Indoor unit
(M-HWM)
Water
temperature
decrease
trouble
All stop Water temperature
continued the low status
regardless of that the
water-heater and water
pump is operating.
A02 A02
• Check the line heater
• Check the PMV coil and
PMV.
• Check the 2-way valve coil
and 2-way valve.
Detected indoor
unit No.
Indoor unit
(M-HWM)
Activation of
water heat
exchanger frost
protection
All stop Frost protection for water
heat exchanger is activated.
A04 A04
• 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).
Indoor unit Indoor-outdoor
communication
circuit trouble
(detected at
indoor end)
Stop of
corresponding
unit
Indoor unit is not receiving
signal from outdoor unit.
E04 — —
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
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