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How do you turn this on? If it is an air button that you push, it may well be the air switch in the motor is bad. The air switch is latching so when you push the button on the tub it closes the switch and lets the power go to the motor. When the button is pushed a 2nd time the switch will open and shut off the power going to the motor.
An air switch will cost about $21 to purchase.
If your bath pump LD7A-C will not shut off when you push the air button then the AIR SWITCH in the motor needs to be replaced. This is a pretty common problem with Bath Pumps and easily fixed.
If your Bath Pump will not shut off when you push the Air Button, it sounds as if the Air Switch is not working in your Bath Pump. Click on the Air Switch name and it will show you the replacement part you need to fix the Bath Pump.
The air button on your tub may be bad and not sending enough air to the air switch located on the bath pump. The way to check this is to remove the bath pump and see if you can turn the bath pump on by taking a large straw and blowing into the air switch on the bath pump to see if you can get the bath pump to turn on. If the bath pump comes on then you know you have a bad air button. If you cannot get the bath pump to turn on then remove the air switch and plug the two wires going to the air switch together and then plugging the pump into a power outlet you know has power. If the bath pump comes on then you know you need a new air switch in the motor. If the motor does not come on then you need a new bath pump.
What you are experiencing when you push the Air Button down and it engages the BATH PUMP but when you release the the Air Button is a bad Air Switch in the BATH PUMP. When you push the air button down it sends a column of air to move a small switch in the BATH PUMP. When the switch in the BATH PUMP is bad it will not engage. What you need is a new Air Switch model TBS-339.
I assume you hooked the hose back up to the air switch on the motor. There will only be a couple of things to check. Make sure you have a good connection with the air hose to the air switch on the motor. Sounds like maybe the air switch may be bad. The Air Switch is a latching air switch so if is broken then it won't latch when the air button is pushed.
The Magic Touch control has been discontinued now for some years. You will need to remove it and install a control that will have it operate with an air switch/air button system. This is a pretty simple fix but will run you right around $70 for an Air Switch Kit.
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