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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 Troubleshooting 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 ue gas discharge is sufcient (3.8 “Air supply
and ue gas discharge”).
5. Check for blockage of the air supply and the ue gas
discharge. Remove any blockage.
6. Check for blockage of the condensation drainage. Remove
any blockage.
7. Measure the pressure difference over the pressure switch.
See the table in (10.2 “Prepare maintenance”). Clean the
heat exchanger in case of insufcient pressure difference.
If the pressure difference is sufcient, check if the air pressure
switch closes using a multimeter.
8. Check the supply voltage. This should be 230VAC
(-15% +10%).
Contaminated air inlet
lter
Clean the air inlet lter (10.4.4 “Cleaning the air inlet lter)
46


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A.O. Smith TWI 45-190 Usermanual and installation guide - German - 64 pages

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