A.O. Smith TWI 45-190 Troubleshooting table for errors visible on the control, Light pulses, 1 SC

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Instruction manual TWI 35-130 G/TWI 45-190 G

9.3Troubleshooting table for errors visible on the control

Errors visible on the control

Light pulses	Cause	Solution		Remark
1 (SC)	Defective air pressure	Replace the air pressure switch.		The error will automatically disappear when the air pressure
Air pressure switch	switch			switch opens again.
closed
2 (SC)	Break in the cable /	1.	Check the cabling between the air pressure switch and the	Contact the installation engineer if the error cannot be remedied
Air pressure switch is	Open circuit		control.	or if it reoccurs. Also contact the installation engineer for replacing
not functioning well		2.	Replace the cabling if necessary.	the required parts.
	Air pressure switch	1.	Check if the fan is running
	does not close	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 flue gas discharge is sufficient (3.8 “Air supply
			and flue gas discharge”).
		5.	Check for blockage of the air supply and the flue 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 insufficient pressure
			difference. If the pressure difference is sufficient, check if the
			air pressure switch closes using a multimeter.
		8.	Check the supply voltage. This should be 230VAC
			(-15% +10%).

Instruction manual - TWI 35-130 G/TWI 45-190 G 46