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

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In line heater will not light up when turn on

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  • Jacuzzi Master
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You will need to check where it is installed and compare that to the model number of the heater. A vacuum heater must be installed in front of the pump on the suction line coming from the suction cover inside the bathtub. If you have a WOW pump then that style of heater will not work in the suction line because the pump doesn't have enough '****' to operate the vacuum switch.
A pressure heater is installed in the pvc piping after the discharge of the pump. anywhere in that line before a the jets.

Posted on Jan 12, 2011

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Posted on Jan 02, 2017

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The light is supposed to be on when the tub is full of water and the pump comes on. Make sure the heater is plugged into a seperate breaker, it cannot be on the same line as the pump.
Look on the heater for a label. If your heater is installed on the discharge side of the pump it should say "pressure heater" on it. If it is installed in front of the pump it should say "Vacuum Heater" on it.
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I am not familiar with this heater but it sounds like it could be a blockage in the main gas line into the heater or perhaps a blockage to the pilot gas line and maybe starving for gas. Best bet first is to check the main gas line from the heater. Easiest way to do this is to remove it from the heater and blow it through with compressed air. Then try the heater again. If that doesn't fix the problem then you can try blowing compressed air down through the pilot line. Could be a little dirt creating a blockage there. Then try the heater again. If it still does the same thing then try removing the panels to expose the heater's piping. If you can remove the main pipe into the heater from the gas and blow compressed air through it it should clear any obstruction from both the main line and the pilot. If this doesn't work then I would think you have a more severe problem and will need to take it to your local Heater Repairer. Hope this helps.

Regards
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