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Toshiba
[A07] Error Pressure switch operation (Hot water supply/Heating 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
Lower set temperature
Yes
Continued
operation at high outside air
temperature and at 50°C or higher
set temperature
No
Attach TWO sensor
No
TWO sensor
is attached
to pipe.
Yes
Replace pressure switch
No
Pressure switch
is normal
Yes
Yes
Yes
Replace water heat
exchange control board
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 79 Monday, October 5, 2009 2:09 PM