Toshiba HWT-602S21SM3W-E(TR) Service Manual page 141

[F32] Flow sensor failure
Start
Flow sensor
connector (CN609)
is connected
Flow rate detected
by flow sensor is almost same
as actual value
Check water heat exchange control board
If defective, replace it
[F33] Flowing quantity failure
Start
Miswiring between
flow sensor connector (CN609)
and low pressure sensor
connector (CN607)
Water flow is detected
by flow sensor during no
pump P1 operation
TC sensor
characteristic is correct
Flow rate detected by
flow sensor is almost same
as actual value
Check water heat exchange control board
If defective, replace it
No
Yes
No
Yes
PC board
MCC-1753
Yes
No
Yes
No
Identify the cause and resolve it
ex.) Flow due to the external pump
No
Yes
No
Yes
PC board
MCC-1753
Connect each sensor
correctly
Flow rate detected by
flow sensor is almost same
as actual value
Yes
Replace TC sensor
Replace flow sensor
140
Correct flow sensor
connection
Replace flow sensor
No
Replace flow sensor