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9-4. Diagnosis flow chart for each error code
9-4-1. Hydro unit failure detection
[A01] Error Pump flow determination
Pump rotates
Replace TC sensor
Remove waste
Dirt clogging inside
water circuit
12 M or longer water
pipe to a branch,
or 5 or less branches
Fit buffer tank and the
second pump
Attach or replace
flow switch
Connect flow switch
connector to board
No
No
(Identify causes, and resolve)
(strainer)
Excess air noise
comes from inside
the pump
Flow switch is
connected to board
Built-in pump is
connected to board
Flow switch is normal
Chattering noise comes
from flow switch
Pump stops 2-3
minutes after its rotation
started
TC sensor characteristic
is correct
Yes
Yes
[A01] occurs
Operation restarts
Water heat exchanger control board
is defective, replace it
Perform
air vent
Flow shortage
No (No pump sound)
No
Connect pump
connector to board
No
Replace flow switch
No
No
No
No
Yes
Flow switch is normal
Yes
Replace pump
Yes
Yes
No
Yes
Yes
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 74 Monday, October 5, 2009 2:09 PM