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Heater light flashes but heat will not come on on its own

I con turn it on manualy when i turn the pump on but if the tub sits for a few days the tempurature will drop way down

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I have just filled my hot tub after cleaning it out
all the pumps work but it will not start to heat up.
the heater light is flashing and I am sure it should just be a permanent light on.
any ideas

Posted on Oct 31, 2009

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Sounds like the heating element is going bad, have someone come out and change it, it will be fine

Posted on Jun 04, 2009

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Posted on Jan 02, 2017

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http://waterheatertimer.org/How-to-install-under-counter-water-heater.html
Under-counter water heater located near tub will supply hot water just like ordinary household water heater. But it will not reheat water that circulates inside the spa tub.
Otherwise, a spa heater is made with electric element that can work with 120V or 240V. Water from tub circulates through tank that holds element. Element must be fully immersed in water.
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How big is your bathtub? Is your water heater set on the hottest setting? What is the temperature of the hot water at the tap?

Keep in mind that hot water can cause severe burns. Children and those with diminished mental capacity can be seriously harmed by hot water.

The "40 Gallon" rating on the water heater is usually the amount of hot water the unit can produce in one hour. So the tank, and the amount of immediately available hot water, might be smaller than 40 gallons.

My bathtub is 2 feet wide by 1 foot deep and 4 feet long. This is 8 cubic feet or almost 60 gallons. So a 40 gallons of water at 120 degrees, mixed with 20 gallons of cold water (60 degrees), fills the tub with 100 degree water. My January cold water is 42 degrees, so it will take 40 gallons at 129 degrees to fill the tub. If the tub is cold to start it will take even hotter water.

So the water heater might be just fine.

Possible solutions:
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2. insulate your hot water pipes so that the water loses less heat on the way to the tub.
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