It goes on when probe is in, off when probe is out. Consistently

 

What about LED3?

 

When low probe is in, LED2 on, pump off
When low and high probe in, LED2 on, LED3 on, pump on, LED1 on
Remove high probe from water, LED2 on, LED3 off, pump on, LED1 on
Remove low probe, everything goes off.
This is how it should work, yeah.

Tested the other parts.....
When I press SW2, LED1 is on and pump is on. LED2 has a very very slight flash to it.

When I use the transmitter SW1, the pump and LED1 is on and oddly LED2 comes on, it should not be on.
The radio receiver is connected to an electronic switch which reads the PWM signal from the receiver. The channel on the transmitter is like a toggle switch, so it is either on or off. I tried the input power to the electronic switch from 5v from the circuit and the 8v from the power supply.

This is the electronic switch. It's the 20amp version.
https://www.ebay.com/itm/226295046177?var=525539438279

 

When I use the transmitter SW1, the pump and LED1 is on and oddly LED2 comes on.

Possible the transmitter is too close to the breadboard especially with all those wires around.
Try adding 100nf capacitors C3 and C4 across resistors R7 and R8.

 

LED2 still goes on with the transmitter

 

LED2 still goes on with the transmitter

Is it fully ON and how close is the transmitter to the breadboard?

 

Yes, and on solid.

I stepped about 20 feet away and can still see it going on. Any further and I can't see what is happening.

 

You could try changing C3 to a 1uf cap.

 

I have lots of caps, but nothing that size or nothing close to 1uf.

 

This only happens on LED2, correct?
What is the closes size you have on hand to a 1uf?
If you remove that yellow jumper from R3 to the main board does LED2 still come on when transmitting?

 

Yes correct.
I'll check again in the morning. Have electrolytic caps that I did not check if one of those might work?
Have to call it quits for today. I'll try again tomorrow.

Appreciate your help and sticking with this. Almost there.