please help me on trouble shoot /tunze 3155 ato

[cracker]

The pump won't turn on when the water level drops. the too low light is blinking.
If I unplug & plug in, it runs for a while & stops again .
The pump runs & is well submerged & no air is trapped.
If I add some rodi to the mark, the water level light stays green . When enough evap occurs. The pump will not turn on to refill.
I took out the float sensor & cleaned.
I have another new pump on hand & about to try this. However woild rather leacve it in the bag if You Folks think it could be a controller issue. Thanks for any insight.

 

[Reefltx]

The pump won't turn on when the water level drops. the too low light is blinking.
If I unplug & plug in, it runs for a while & stops again .
The pump runs & is well submerged & no air is trapped.
If I add some rodi to the mark, the water level light stays green . When enough evap occurs. The pump will not turn on to refill.
I took out the float sensor & cleaned.
I have another new pump on hand & about to try this. However woild rather leacve it in the bag if You Folks think it could be a controller issue. Thanks for any insight.

Likely it’s the pump. I had one do the same thing that was about 4yrs old. Would not start unless I shake it. I replaced it with a new one. I totally forgot how quiet these can be.

 

[cracker]

I will give it a good shake & gentle whack to the side of the barrel . Just topped offso it will be a while before all the lights come on again.
That being said. The pump does run when unplugged then plugged in for a short while. A lot less than the 10 mins stated in the instructions.

 

[cracker]

I did try the shake & bang already no deal. If it had kicked on I'd know for sure it was the pump.

 

[cracker]

thing works fine now . No tellin most likely user issues.