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Heater displays SNS - sensor failure. what do i do?

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Sns occurs when sensor reads temps under 36 degrees or above 110 degrees. check temp of of water to verify.....may need a new water sensor

Posted on Mar 13, 2014

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SOURCE: I get SNS Error on my Raypak Digital pool heater display . . .

refers to flame sensor in combustion chamber

Posted on Jun 20, 2009

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Getting a sns code on control panel display. Where is the sensor located on this pool heater?


In the header... Plumbing side
And wire plugs onto heat / control assembly board.
SNS indicates that the Temperature Sensor is out of range! There are two thermistors within that sensor, and if there is a difference of 2 degrees, the board will throw a Fault Code: SNS
check for good connection at board, and ensure the sensor is all the way seated properly in its well.
otherwise, it may be bad.

Apr 25, 2015 | Rheem M266A 266K BTU Pool or Spa Natural...

1 Answer

Display is reading sns. what does this mean?


SNS 1) SENSOR IS FAULTY
2) TEMPERATURE IS ABOVE 110°F
3) TEMPERATURE IS BELOW 36°F

It is one of the above situations

Apr 27, 2011 | Raypak 2100 Pool Heater Gas 336000 BTU'...

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I get sns on my heater


SNS on Raypak heaters means the following:

1. Water temp is below 36 degrees F, or above 110 degrees F.

2. The sensor contains 2 thermistors. If they are more than 2 degrees aparts, an SNS failure will occur. Replace sensor.

3. Loose or corroded connection at P1 on the main CPU board (right behind the LCD screen)

4. If the sensor is not mounted ALL THE WAY into the JACO fitting (on top of the header) it will give a false reading.

It is more likely than not, that you need to replace the temperature sensor. Part number 009577F.

Jan 26, 2011 | Raypak Free Hydraulic Lift Gate Delivery -...

1 Answer

Rheem 206 propane heater will not fire has code #sns what is the problem? the water is 65 degree.


SNS means the temp sensor is out of acceptable range. Could be the following:

1. Water temp is below 36 degrees F
2. The sensor contains 2 thermistors, if they are more than 2 degrees apart and SNS failure will occur
3.Loose or corroded connection at P1 on the main board
4. If the sensor has come out of the JACO fitting on the header, it may read a SNS failure.

Solution, visually inspect the connections for corrosion. If it looks ok, then replace the temp sensor.

Jan 01, 2011 | Rheem M206A 206K BTU Pool and Spa Propane...

2 Answers

Codes for model 335B Raypack Gas Heater


Codes should be found inside of the cabinet in the uper left corner.
If they are not there, here are the basics

EOL = Testing mode
BDI = BOARD FAILURE
EEP = MEMORY CHIP FAILURE
PRS = PRESSURE SWITCH FAILURE
HL1+HL2 = HIGH LIMIT EXCEEDS 135F
SPR = AUXILLIARY INPUT FAILURE
ROL = ROLL OUT SENSOR TRIPPED
SNS = TEMPERATURE BELOW 36 OR ABOVE 110F
FFL = FALSE FLAME SIGNAL
GCO + GVC = POWER TO GAS PV OR MV WHEN NOT SUPPOSED TO BE
FAN = AIR SWITCH OR FAN FAILURE
TAB = TAB FOR LO NOX NOT BROLEN OFF OR AIR PRESSURE SWITCH FAILURE
ILO = PROPANE GAS LOCKOUT AFTER 90 IGNITION TRIAL
IGN= LOSS OF FLAME OR FLAME SIGNAL

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2 Answers

Opened pool. Rheem heater has the service light blinking


rollout switch is open, and sns is a sensor failure. replace rollout switch, clean out vents, inspect heat exchanger. water sensor senses too cold or too hot water

May 28, 2010 | Rheem 266K to 399K BTU Swimming Pool...

1 Answer

My raypak heater is not working I have power but the screen is showing an error message SNS. What do I look for what sensor is not working.


Here is the link for the manual for your boiler.

http://www.raypak.com/uploads/6000.59R.pdf

SNS Sensor failure, Water temp. below 36°F
or above 110°F - The water temperature sensor has failed or a wire is broken. (page 35)

Jul 16, 2009 | Raypak Free Hydraulic Lift Gate Delivery -...

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