I am installing a new 3155 in my Red Sea max 250. Installed sensors in far left rear sump chamber (viewing from front). Initially the optical sensor sees water level and turns off pump. Then after approximately 5 minutes the yellow LEDs flash and pump starts again. Water will run till eventually the float switch shuts the pump down and alarm occurs. Have tried this multiple times with same over filling occurring. Both sensors are clean. Ant ideas? Defective unit?
Tune 3155 optical sensor issue
- Thread starter zeke2000
- Start date
Kalen
New member
I had the same issue about a month ago on a new unit. I ended up sending it back to bulk reef supplies and am currently waiting on a replacement unit.
Start with the following self diagnostic-
Have the optic sensor clean and completely dry. Plug in the controller, it will flash four lights and beep and for about one second show a single LED before the pump on (yellow) light comes on and it runs the pump for about 15 seconds. That brief light means the following green- optic sensor is good, yellow- optic sensor is dirty, even just a fingerprint, red- the optic sensor failed it either has a break in a wire or is extremely dirty. Note that a wet optic sensor will always fail. The optic sensor is replaceable.
Assuming it passes, try rinsing the sensor in hot soapy water and reinstall it away from any sources of bubbles. The optic sensor only detects air vs water and cannot differentiate bubbles from being dry. A test for bubbles is to wipe your finger under the sensor if you catch it in the act, if it stops filling within 5 seconds, the cause is bubbles.
Have the optic sensor clean and completely dry. Plug in the controller, it will flash four lights and beep and for about one second show a single LED before the pump on (yellow) light comes on and it runs the pump for about 15 seconds. That brief light means the following green- optic sensor is good, yellow- optic sensor is dirty, even just a fingerprint, red- the optic sensor failed it either has a break in a wire or is extremely dirty. Note that a wet optic sensor will always fail. The optic sensor is replaceable.
Assuming it passes, try rinsing the sensor in hot soapy water and reinstall it away from any sources of bubbles. The optic sensor only detects air vs water and cannot differentiate bubbles from being dry. A test for bubbles is to wipe your finger under the sensor if you catch it in the act, if it stops filling within 5 seconds, the cause is bubbles.
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