I've got a grey water pump out problem and it all seems to boil down to this circuit board. I need to draw up a schematic for it but I'm hoping until then someone can help me out with a few questions.
In my grey water tank I've got 2 float switches, an upper and a lower.
The lower level float switch is usually in the up position until the upper float switch is triggered. The pump then runs until the lower float switch is open. Usually about 3 minutes.
What is telling this pump to run for 3 minutes once the upper float switch is open?
I'll walk you around the board.
1. 24vac incoming on the 2 yellow leads.
2. Rectified... to 32vdc. upper right hand corner.
3. Green/Black wires go to lower float switch.
4. White/Black wires go to upper float switch.
5. Power out to a 24vdc/120/vac relay to trigger pump.
I've replaced the float switches, rectifier, the 2200uF 50V Cap and the diodes with no change.
I've jumped from the red on the relay to bypass the MOV and resistor that goes to Green wire (I have no power to the green) Doing this I do get the pump to turn on at the upper float switch trigger, but it only runs until it falls back down, maybe 20-30 seconds.
So maybe it's gotta be that MOV causing a problem? Among other things...
The biggest head scratcher for me is where is the timing coming from?
Thanks in advance for your help!