Raypak Heater Trouble

[wireform]

Good morning with an ambient temp of 38° now. Came out to one of my pools with a
Raypak model #P-R406A-EN-C,
serial #1412246332
that's usually close to 90° but is only at 80° now, I guess residual water temperature from constant heating because the display reads " sensor failure " and heater is obviously not firing now. Anyone familiar with this as I need guidance before I delve into it . Thanks in advance, Allan.

 

[ajw22]

SNS error is a bad water sensor.

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Part 6C.

P/N 009577F

 

[jimmythegreek]

I believe you can ohm out the sensor and get a value that relates to current temperature its seeing for a reference

 

[ajw22]

I believe you can ohm out the sensor and get a value that relates to current temperature its seeing for a reference

It is a 10K thermisitor. The sensor can be tested with a multimeter. It should read 10,000 ohms at 77F (25C) degrees. You can lookup other test values in the Temperature vs Resistance Conversion Chart for 10k Thermistors.

Temperature Sensors - Further Reading

 

[wireform]

The temp sensor it was. Replaced and all is working well now. Thanks to all that chimed in.

 

[wireform]

I'm back. Customer contacted me saying temp sensor on again. I know it was heating when I left. What need I look for now.

 

[jimmythegreek]

Start by teating the temp sensor. Crappy luck could have gotten you a bad sensor, I know that would be my luck. What is the screen showing?

 

[wireform]

Ok, back again. @James thanks for your response. I don't buy the bad luck too fast. With the temp at 36° now I went at it. Screen reads sensor failure after I turned the power switch to on and heard the igniter try once and stop. My experience told me a possible contact issue at the board end, so I wiggled the connector and wallah heater ignited so then I did the following. I used a razor blade knife and carefully scoured the three contact points that mate with the plug assuming it is oxidation not giving good contact. All is well now.