Dishwasher Doesn't turn pump on?

Question

Hi all.

I've just installed a dishwasher, and I've noticed something which is going to make it a pain in the rear if it's not fixed!

When the dishwasher "asks" for water, I have to turn the tap on in order to get the pump running and feeding water to the dishwasher. I've noticed it does it 4 or 5 times a cycle, so I can't go out and leave the dishwasher on as it won't get water!

The only thing I can think of is the distance between the dishwasher and the supply pipe. I've got a "Y" splitter on the supply, and there's about 3m of hose between the supply and the dishwasher. The washing machine doesn't have this issue, and there's 1m of hose between it and the supply pipe.

Any suggestions appreciated!

Cheers,
Ash

Tony · Answer

It would seem that when you turn the tap on you relieve some of the pressure.  At lower pressures the valve may function normally but at the higher pressures it can't overcome the difference and open the valve.  Either there is too much line pressure or the valve on the DW is bad.

Check your water pressure at the hose outlet.  Go to Lowe's or HD and buy a gauge that screws onto the water line and check your pressure.  It should be normally around 50 PSI.  80 PSI is not uncommon but on the high side.  If your pressure is 100 or more I'd say you might have a bad pressure regulator - or you may need to adjust it down.  Your water pressure regulator can be either out at the meter or can be where the water enters the house.  Come to think of it I have no idea where mine is.  But then again I haven't gone looking for it.  It's certainly not inside the house (my house that is) because I've redone the plumbing from the main water valve throughout the house.  So it must be out by the meter.  Either that or the city is regulating the pressure over all.

If you can't find your regulator then you should probably have a plumber look at things.

If you're talking about well water (since you mention a pump) then the pressure in the system may not be set properly.  Proper pressure should be between 40 and 60.  At 40 PSI the well pump should come on and supply water to the system.  At 60 PSI the pump should shut off.  Since you said "Pump" there could be a problem with your well system.  That too should be looked at and made sure everything is correct.  The pressure switch that controls the pump may be going bad OR the reservoir may be overly full.  If your water pressure starts out strong and drops quickly then you might just need to recharge the reservoir bladder to maintain proper pressure.  Don't ask me how to recharge your system, I don't know.  I know very little about them but what I speak of I do know.  I won't tell you to do something when I don't know how to do it myself.

Hope this helps.

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Dishwasher Doesn't turn pump on?

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