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[A09] Overheat protection operation
Put water into water circuit
(Recommended: 1 - 2 Bar)
Replace heater unit
exchanger air vent valve
or
Check water heat
exchange control board
If defective, replace it
Replace flow sensor
No
No
Water cycle contains water
Yes
Flow sensor 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: 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).
PC board
MCC-1753
MCC-1755
Check water
heat exchange
control board
If defective, replace it
PC board
MCC-1753
MCC-1755
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