Toshiba HWT-602S21SM3W-E(TR) Service Manual page 137

[F14] TTW sensor failure
Start
TTW sensor connector
(CN603 (MCC-1753), CN03,
CN20 (MCC-1755)) is
connected
TTW sensor
characteristic is normal
Check water heat exchange control board
If defective, replace it
[F17] TFI sensor failure
Start
TFI sensor connector
(CN603 (MCC-1753), CN03,
CN20 (MCC-1755)) is
connected
TFI sensor
characteristic is normal
Check water heat exchange control board
If defective, replace it
[F18] THO sensor failure
Start
THO sensor
connector (CN602) is
connected
THO sensor
characteristic is normal
Check water heat exchange control board
If defective, replace it
No
Yes
No
(Refer to Characteristic table on page 137)
Yes
PC board
MCC-1753
MCC-1755
No
Yes
No
(Refer to Characteristic table on page 137)
Yes
PC board
MCC-1753
MCC-1755
No
Yes
No
(Refer to Characteristic table on page 137)
Yes
PC board
MCC-1753
136
Correct TTW sensor
connection
Replace TTW sensor
Correct TFI sensor
connection
Replace TFI sensor
Correct THO sensor
connection
Replace THO sensor