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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
There are a couple of things for you to check. Look for the heat indicator light on the topside panel. Is it on? If it is on you may need a new temp sensor or hight limit sensor. If it is NOT on the the pressure switch may be out. Not sure why you are not getting an error code on the topside panel.
Turn off all power to the hot tub as soon as you realize it is
overheating. The spa should have an automatic shut off when the water
temperature reaches about 112 degrees fahrenheit. Call your hot tub dealer or manufacturer for service options. There are a
variety of conditions that could lead to the overheating of your hot
tub, but may differ in various hot tub models and brands. Check the water level of the hot tub. Low water levels could be the culprit for the over heating, so you may just need to add more water to the hot tub. Check the shut-off valves in the hot tub. If they are closed while the hot tub heater is on, it could cause the water to reach unsafe temperatures. Clean the hot tub filter. A dirty filter could be blocking the flow of water, causing the water to sit in the hot tub and overheat. Turn the power back on after finding the problem and talking to the hot tub dealer. The hot tub will probably not start back up until the water reaches a safe temperature
Hi, 3 Flashing dots (display) - Water flow problem check for closed valves, dirty filters, water level, pump/wet end operation/defective pressure switch. If your spa has been off for a while its likely something is blocking the lines. Flashing dots & Lit light on display - Hi-limit trip, reset power to clear.
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.