Toshiba ESTIA HWS-1501CSHM3-E, Service Manual

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[F23] Error Low pressure sensor detach failure
[F29] Error EEPROM failure
A failure is detected in the IC10 non-volatile memory on the water heat exchanger board during a hot water supply
unit operation. Replace the service board.
* If the unit does not have EEPROM inserted when the power is turned on, or if EEPROM data read or write is
unavailable, automatic address mode repeats. In this case, the intensive control unit displays [97 Abnormal].
[F30] Error Enhanced IC failure
Enhanced IC on water heat exchanger control board is abnormal.
Replace the water heat exchanger control board to a service board.
[L07] Error
At the time of power on, detecting the above failure automatically activates the automatic address setting
mode.
(Check code is not output)
Note that if the above failure is detected in the automatic address setting mode, a check code may be output.
Attach lo pressure sensor
Replace lo pressure sensor
Yes
No
Lo pressure sensor
is detached (CN207, 212)
No
When operation
is stopped, lo pressure sensor
is normal *1
Yes
Start
*1 How to determine: When operation is stopped
Replace water heat exchange control board
(Power on) Handy remote
controller displays
"Setting" "Setting"
disappears
Reboot
(reset)
(Repeat)
(Approx. 3 mins) (Approx. 1 mins)