How to test if a hot tub heater is bad?


Old 08-13-19, 10:20 AM
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How to test if a hot tub heater is bad?

When I purchased my home it came with a hot tub. I was told that the hot tub needed a new heater. As much as I want to believe this, I would like some validation before purchasing one. I am hoping to tackle the diagnosis and repair myself as the local hot tub repair shop wants $90 an hour, plus $90 for coming to my house.

How can I verify that the heater is not working and it is for sure the heater is bad? Then if the heater is bad, how much is involved to repair this?

I attached a photo of my hot tub for reference.


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Last edited by PJmax; 10-01-19 at 08:49 PM. Reason: resized picture
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Old 08-13-19, 11:38 AM
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Your control panel looks like what Hot Spring used 1998-2008. Unfortunately it means the 5 year heater warranty has expired.

This is a quick and dirty way to test the heater. This only checks to make sure the element is not burned out and that it isn't shorted out. First you need a multi meter. Disconnect power to the spa and open it up so you can access the heater. Label the wires that go to the heater and take a picture. Then disconnect the wires. Set the meter to test for resistance and put your probes on where the two wires connected to the heater. You should see some resistance number. If it shows an open condition the heater is bad. If it had resistance then set the meter to test for continuity. Place one probe where a wire attaches to the heater and touch the other probe to the metal flange on the face of the heater or to the heater's metal body. There should be no continuity. If there is the heater is bad.
pfar54 voted this post useful.
Old 08-14-19, 07:16 AM
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Thanks! I'll give it a try this weekend.
Old 08-16-19, 02:36 AM
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good topic, i am also investigating
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