A.O. Smith TWI 35-130, Instruction Manual

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46 Instruction manual TWI 35-130 G/TWI 45-190 G
Instruction manual -
TWI 35-130 G/TWI 45-190 G
46
9.3
T
roubleshooting table for errors visible on the control
Errors visible on the control
Light pulses
Cause
Solution
Remark
1 (SC)
Air pressure switch closed
Defective air pressure switch
Replace the air pressure switch.
The error will automatically disappear when the air pressure switch opens again.
2 (SC)
Air pressure switch is not functioning well
Break in the cable / Open circuit
1.
Check the cabling between the air pressure switch and the control.
2.
Replace the cabling if necessary
.
Contact the installation engineer if the error cannot be remedied or if it reoccurs.
Also contact the installation engineer for replacing
the required parts.
Air pressure switch does not close
1.
Check if the fan is running
2.
Check if the hoses are correctly mounted on the air pressure
switch. 3.
Check the hoses on the air pressure switch for cracks. Replace the hoses if necessary
.
4.
Check if the
fl
ue gas discharge is suf
fi
cient
(3.8 “Air supply
and
fl
ue gas discharge”)
.
5.
Check for blockage of the air supply and the
fl
ue gas
discharge. Remove any blockage.
6.
Check for blockage of the condensation drainage. Remove
any
blockage.
7.
Measure the pressure dif
ference over the pressure switch.
See the table in
(10.2 “Prepare maintenance”)
. Clean the
heat exchanger and burner in case of insuf
fi
cient
pressure
dif
ference. If the pressure dif
ference is suf
fi
cient, check if the
air pressure switch closes using a multimeter
.
8.
Check the supply voltage.
This should be 230V
AC
(-15%
+10%).