One of the jets in the back of the tub stopped working a few weeks ago and now the second jet in the back has quit working. The tub is only a year and half old and is in a vacation home/rarely used. The tub is built in, so access to the works is limited.
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Mine is a jet3 ultra and I had this problem a few weeks ago and I thought it might be the batteries.
Turned out that the connection at the control arm was quite dirty.
Once cleaned it works OK ... you could try that.
First of all, what you have is a WOW pump that has an E-switch for a control.
There is a knob on the top lip of your tub that you turn a 1/4 turn to turn this pump on/off.
There is a small circuit board inside the box on top of the motor. This is likely the source of your problem.
Here is your biggest problem. That little circuit board is not made anymore. We have the e-switch but you will be better off changing out the pump (which you have to do anyway) with a new WOW pump with an air switch and change the switch on the top lip of the tub to an air button which will turn the pump on/off.
This sounds to us like maybe you have an air lock in the system.
Turn the pump on and while it is trying to operate, loosen the discharge union on the water pump until it is spraying water (do NOT unthread it very far).
Most of the time if you have an air lock this will solve the problem.
This is an automatic feature to dry out the pipes and prevent mold. The next time you turn on the pump after leaving these tubs for a few weeks you get lots of black **** in the water and this is what this feature prevents. Sounds like the tub is working fine :)
Most jetted tubs turn off after 20 to 30 minutes. It is a safety feature as well as a thermal protection feature for the motor. I doubt if there is anything wrong with your tub. If you contact the manufacture of the tub, they will most likey confirm what I have said to be what is going on. If it was a hot tub, like the ones used outdoors, this would signify a problem.
check behind the access door for a air tube that goes from motor switch to button if either side has come off you have to re attach it just cut off 1/4 inch of the tube before you do. that will make it fit tighter