Toshiba HWT-601XWHM3W-E - Page 118

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[E04] Regular communication error between hydro unit and outdoor unit
[F03] TC sensor error
Outdoor unit error occur
(Check the display board
of outdoor unit)
Yes
Solve the outdoor unit error
No
The wiring and
connecting between outdoor
unit and hydro unit
are correct
Correct wiring and
connecting wire
No
Yes
Hydro unit
CN01 connector and
TB01 terminal block (1, 2, 3)
wiring are correct
Correct connector and
terminal block wiring
No
Yes
When power is
on again, D503 (Yellow LED)
Flashes
Check outdoor
control board
If defective, replace it
No
Yes
Check water
heat exchange
control board
If defective, replace it
PC board
MCC-1753
PC board
<401, 601> MCC-1768
<801, 1101> MCC-1675
Correct TC sensor
connection
Replace TC sensor
No
No
TC sensor
connector (CN601) is
connected
Yes
TC sensor
resistance characteristic
is normal
Yes
Start
Check water
heat exchange
control board
If defective, replace it
PC board
MCC-1753