It is most likely not a bad reading on the on the display.
One culprit of a false temp reading could be:
If the temperature sensor is installed after the heater and the circulation pump is clogged or failing, this would allow super heated water to reach the temperature sensor and give you that reading. However, most pool/spa heaters have a high limit switch that would shut down the heater @ 150 degrees F. So this is also unlikely.
The most reasonable answer is to replace the temperature sensor.
If you refer to page 22 in this manual http://www.jandy-downloads.com/pdfs/Allbutton_manual.pdf
you will see that the temperature sensor is installed on terminals 5 and 6.
Trace these wires. They will goto a thermowell (which holds the temperature sensor) either in the pool plumbing, or to a temperature sensor in the heater itself. Temperature sensors when in the heater are located typically above the inlet/outlet header. There will be some disassembling required to access it in this case.
If it is in the heater and you need more help, e-mail me @ [email protected]
Please take the time to give me a positive rating on this post if I have helped.
Thanks
adam
Testimonial: "Thanks for the prompt response. I'm at work now but I will follow your instructions when I get home. I had a feeling that it is a 'bad' sensor. "
System locked
up. Handheld is frozen at WAITING screen
means Microprocessor is locked.
Here is what
you do:
1.
Turn off
power to the system (control box)
2.
Disconnect
battery at the Power Center (9volt battery in control box/cross tip screwdriver
required)
3.
Turn on power
4.
Reconnect the battery
5.
Reset time and date on PDA.
6.
Thank me.... BadWally sends
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