We have a 2004 jacuzzi J365 hot tub. In Jan we noticed the temp going down so we emptied the hot tub and drained all of the pipes. Last week we opened it up and saw the ground wire to the heater had detached. We reattached the wire, filled the hot tub and started it. After 2 days the temp went from 65 to 86. Not sure if it was the outside temp heating the water because it was in the 80s both days. When we put our hand where the heated water comes out, it doesn't seem to be hot. Any suggestions on what to do would be greatly appreciated before we call someone.
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If your hot tub is running but NOT heating then you need to look at a couple of things. First, on the topside, is the heat indicator light on? If it is on and the tub is not heating then the temp sensor or the high limit sensor is not working and need to be replaced. US Parts Center
first you have to unscrew the tub show which is the piece on the floor of the tub where the water drains out. then get behind the front of the tub and you will see youre waste and overflow. at the bottom where the pipe goes to the tub shoe there is a slip nut that connects the pipe to a tee. unscrew the slip nut and pull out the pipe and there you go.
Is the equipment to heat and filter the hot tub separate from the pool equipment or do both bodies of water share a common heater and filter pump? In most cases they share a pump and heater with valves that direct the flow of water depending on how the pool owner wants to use the pools. The first thing you need to determine then is if the equipment is working properly. Is there flow of water to and from the spa? If so, is the heater burner kicking on? If it is running, is it running properly with sufficient gas pressure, 3-4" tall bright blue flames and stays on continuously during the heating cycle for the spa? What is 'very quickly' for the time to heat the water? In other words, if everything appears to be operating normally but the water is not warming fast enough or at all how much time is elapsing before deciding the heater is not working? How old is this equipment and how much experience do you have with this pool tech or the company they are from?
Is it greasy, oily spider web type junk? Coming through the pipes, new construction or new tub? Could be from the pump, not that it is leaking oil but it has oil in it from the manufacture of it. I would call the jacuzzi people and tell them what you have and that your kids play in the tub and drink the stuff, ought to get them to move on that one. Ask them if they know what it is and what to do about it? Hope this helps.
The tub experienced an overheat situation. This may be due to leaving the t stat turned all the way up and not monitoring or the hi-limit sensor is defective. The hi-limit sensor will shut down the heating cicuit if temp gets above 105 D optimally.the fact that the heater light is on is a good sign that things are working at this point.Whether or not a suitable temp(100-103 D) will be arrived at is to be seen. If spa heat kicks off before set temp is reached then replace hi-limit sensor.
Depending on how you heat the hot water, whether gas or electric, is a missing detail in your problem, but if it is electric then your problem is the size, being only 40 gal, and needing probably about that to fill the tub, will always lead to your current position.
If the hot water heater is gas, the chances of it keeping up are slightly better, but again things like the temperature of the water leaving the tank, any mixing valves, etc. will effect the water temp at your tub. Before raising any temps, make sure you follow local code, as not to scald yourself or others.