3155 osmolator sensor not recognizing low water

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OTB008

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Hello,

I noticed the other day my ATO is not turning on the pump when the water drops below the optical sensor. When I unplug and plug back in the to low light is red for a short time then it goes through the normal 15 seconds or so of running the pump. It then says the water level is ok even if it is not. I have cleaned the sensor and no change. I'm pretty sure the optical sensor is bad. Can the optical sensor be replaced?

Thanks,
Jared
 

rvitko

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The optic sensor can be replaced, however, the most common cause is mineral deposits which will appear as a dull haze when the sensor is dry, they may be invisible when it is wet. I would try a roughly 2 hours soak in vinegar first. If this Osmolator was made after mid 2015, replacing the sensor is easy, it just plugs in, prior to that they are soldered.
 
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OTB008

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Ok thanks. I have dried it and cleaned it with vinegar but I did not let it soak so I will try that this evening. I purchased the unit a year ago but the sensor does not unplug from the display so it must be older than that. When I power it up after the four lights light up the too low light is red for about 15 seconds. Does this mean anything?

Thank you,
Jared
 

rvitko

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That means it failed the self test, it would unplug inside the controller so you have to open it to see the plug. It can fail the self test though just from being very dirty, all the red light means is the voltage was less than half of what it should be.
 
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OTB008

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So I soaked the optical sensor in vinegar for 2 hours and let dry and the sensor is still not working. I am still getting the failed self test red light when I power up.
 

rvitko

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If you have the plug type I can just send a new optic sensor, I would just need a copy of the receipt, if it is the solder type, I would knock it out within a day of getting it.
 
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OTB008

OTB008

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I purchased on amazon and I have the invoice from that will that work? How do I identify the plug type? Thank you for your help.
 

rvitko

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Yes, that is fine. Just undo the 2 screws on the back and open it, there will either be a white 4 pin plug or 4 wires soldered to the board.
 
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OTB008

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I sent you a DM with my address and the receipt. It is a plug in. Thank you for your help.
 

Reeferdood

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Mine just kicked the bucket today.. I wonder if there is a way to bypass the optical sensor and just use the float switch for now?
i just ordered a new one and Ill send this unit to Roger for a back up...
 

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Mine just kicked the bucket today.. I wonder if there is a way to bypass the optical sensor and just use the float switch for now?
i just ordered a new one and Ill send this unit to Roger for a back up...
Roger is amazing. Best customer service bar none!
 
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