Toshiba HWS-803XWHM3-E Service Manual page 107

[F20] Error TFI detach failure
Start
Mixing valve is attached.
Mixing valve connection
is correct.
Mixing valve setting
is correct.
TFI sensor
is attached to pipe
TFI sensor
characteristic is normal
TWI sensor
characteristic is normal
TWO sensor
characteristic is normal
Replace water heat exchange control board
No
Yes
No
(Refer to wiring diagram of hydro unit on
page 22)
Yes
No
Yes
No
Yes
No
(Refer to Charasteristic table on page 122)
Yes
No
(Refer to Charasteristic table on page 122)
Yes
No
(Refer to Charasteristic table on page 122)
Yes
FC_0C: Mixing valve rumning time
106
Attach a mixing valve.
Make the mixing valve
connection correct.
Make the mixing valve
setting correct.
(30sec to 120sec)
Attach TFI sensor
to pipe
Replace TFI sensor
Replace TWI sensor
Replace TWO sensor