Toshiba HWS-P804XWHM3-E1(TR) Service Manual page 99

[F19] Error THO sensor detach failure
THO sensor
is attached to pipe
THO sensor
characteristic is normal
TWO sensor
characteristic is normal
Replace water heat exchange control board
AMP Air Conditioning
Start
No
Yes
No
(Refer to Characteristic table on page 113)
Yes
No
(Refer to Characteristic table on page 113)
Yes
98
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Attach THO sensor
to pipe
Replace THO sensor
Replace TWO sensor