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LED panel on heater does not light up and water temp reads higher then actual 107/64 degrees on control panel

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  • Master
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This is an indication of a bad water sensor. It also tells me that the pressure switch may be bad because if it is working then the light on the panel will light up telling you that the spa water is heating.

Rod
US Parts Center

Posted on Apr 14, 2014

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Posted on Jan 02, 2017

john224
  • 1378 Answers

SOURCE: Raypak RP2100 not showing even close to correct pool water temp.

Bad thermistor probably. It is not a very expensive part.

Posted on Jun 14, 2009

  • 990 Answers

SOURCE: water temp. reading isn't the the same as the

If you have drained the spa latly and refilled you could have an air lock keeping the heater dry. Simpley find the drain valve under the spa and open it till it run's water. This should help the problem by letting the pressure even in the pipeing and flooding. Good luck.

Posted on Mar 11, 2010

adamh294
  • 310 Answers

SOURCE: my hot tub control panel keeps showing OH and the

It sounds like your circulation pump is not keeping up with the heater. Check for debris in the pump impeller. If this is 24 hour circulation pump, it is probably failing. New units are about $200 US

Posted on Oct 28, 2010

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1 Answer

Master Temp 400 reading 32 degrees on LED read out and the remote control is reading 62 degrees. What can cause the difference?


The control panel has its own temp sensor which is a probe into your plumbing. It's typically found between the pump and the filter and is held on by band clamps.

The heater has its own temp sensor found on the header manifold area.

i doubt the water is 32 degrees so I assume the heater temp probe is bad, it needs to be replaced, it's plugged into the circuit board and threaded into the header of the heater.

The two sensors should match or be within one degree of each other for ideal operation.

The reason they have separate temp sensors is to protect the system.

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Standard 10K ohm sensor appears to be compromised. Replace it.
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Sorry this is a late response! Hope that it helps!

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