Error - Toshiba HWS-802XWHM3-E Service Manual

[E04] Error
Outdoor unit operates
Check water heat exchanger
control board
If defective, replace it
No
Yes
of remote controller is
connecting wire (1, 2, 3)
and terminal block (1, 2, 3) wiring
on again, D502 (Amber LED)
Check outdoor control board
Group address
correctly set
Yes
Hydro unit
Internal wiring and
are correct
Yes
CN04 connector
are normal
Yes
When power is
blinks
Yes
If defective, replace it
84
No
Check item code "14"
No
Correct wiring and
connecting wire
No
Correct connector and
terminal block wiring
Check water heat
No
exchanger board
If defective, replace it