Toshiba HWS-802XWHT6-E - Manual (Page 82)

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Toshiba
[A09] Error Overheat prevention thermostat failure (Hot water supply/Heating operation)
Put water into water circuit
(Recommended: 1 - 2 Bar)
Replace heater unit
exchanger air vent valve
Replace flow switch
No
No
Water cycle contains water
Yes
Flow switch is normal
Yes
No At normal temperature,
overheat preventive thermostat
is normal
Yes
Start
Replace water heat exchange control board
or overheat preventive thermostat failure
*Replace water heat exchange control board or overheat preventive thermostat failure: After the control
board is replaced, if the same operation repeats, the overheat preventive thermostat is determined as
defective (does not operate at 75°C).
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 81 Monday, October 5, 2009 2:09 PM