Question about Jacuzzi RapidHeat In-Line Heater U395000 [ Bathtubs and Whirlpools,

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How do you know if the rapid heater for jacuzzi tub is bad?

We have had our jacuzzi tub, model number DC25 for a little over a year.. Long enough now fot the warrenty to be over with. We have used the tub and the heater was working fine, kept the water warm. We notices now that the indicator light on the front of it is not on. We have taken the heater off and looked inside to see if there is any visable reason for the heater to not be lighting up. No visible reason seen. Do you know any suggestions for testing the heaters internal components? Do you know where I can find a schematic on the heater? We did notice that the reset button feels like it is maybee broken. It will not push in at all. I dont know if it just wont because its not tripped. With regular reset buttons that I have seen in other electrical components they can be pushed in and out even if its not tripped, but it just will feel easy. When they are tripped there is a little effert to push them in (like clicking the buttons on a keyboard). Not sure if we need to buy a new heater or if its just something simple internaly. We dont want to buy a new heater if its just the reset button or some other component that can be replaced cheaper.

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All heaters have a thermostat (or multiple) and heating elements. 
Start by removing the elements and seeing if they are burnt through.  If so, replace. 
If they look fine then replace the thermostat(s).
Both are relatively easy and cheap to perform.
Remember to turn off the power and water to the heater and drain the unit completely before doing any servicing.

Posted on Apr 13, 2009

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Posted on Jan 02, 2017

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Need a users manual


Kathy,

I think what you're looking at are the part numbers for the heater and control systems used in some Jacuzzi hot tubs rather than the Jacuzzi model number. I ran into the same issue and discovered through some cross-referencing on the web (jacuzzi parts suppliers) that this is the part number control unit made by Balboa. Odds are they were used in multiple Jacuzzi models.

My suggestion: Look here http://clearcreekspas.com/model_id.html to identify the control panel for your Jacuzzi and then follow the link to the correct manual. Some cover multiple models so you will need to know the electrical requirements of yours (120 V or 240 V?) and then check the layout of each tub shell to determine which model is yours.

I figured out mine is a Jacuzzi Essence Model 350 this way.

Good luck!

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