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 fl ue gas discharge is suffi 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 difference over the pressure switch.
See the table in
(10.2 “Prepare maintenance”). Clean the
heat exchanger and burner in case of insuffi cient pressure
difference. If the pressure difference is suffi cient, check if the
air pressure switch closes using a multimeter.
8. Check the supply voltage. This should be 230VAC
(-15% +10%).
