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Toshiba
[A08] Error Lo pressure sensor lowering operation failure (Cooling/Defrosting operation)
Replace flow switch
Remove waste
Flow switch is normal
Secure water
circulation amount
Circulation flow
shortage
Waste stuck inside
water circuit
12 M or longer water
pipe to a branch,
or 5 or less branches
Remove sufficiently
excess air
Place buffer tank and
the second pump
No
Excess air
noise comes from
inside pump
Chattering
noise comes from
flow switch
Start
No
No
Yes
Raise set temperature
Yes
(Cooling overload operation)
Continued
operation at low outside
temperature and at 15°C or lower
set temperature
No
Defrost outdoor unit
where frost remains
Yes
Defrosting
takes 15 mins or longer
(Frost remains)
No
Replace lo pressure sensor
No
Lo pressure sensor
is normal
Yes
Yes
Yes
Replace water heat
exchange control board
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 80 Monday, October 5, 2009 2:09 PM