Fisher & Paykel DishDrawer Code U1: wash pump has not primed

What U1 means

On Fisher & Paykel DishDrawer DD603 and DD605 series dishwashers, U1 means the wash pump has not primed. The fill valve stayed open for more than three minutes without the pump catching its water. Possible reasons are the tap off, low supply pressure, siphoning, a spray arm or flapper issue, foaming, the motor or the controller. Owners see U1 and the cycle ends early.

Common causes of U1

Water tap turned off or low supply pressure
Siphoning of water out of the drawer
Spray arm or flapper not working
Foaming from too much detergent
Motor or controller

✓ One safe check you can try

1. Open the water valve fully and test the kitchen tap. 2. Make sure only dishwasher detergent is in the unit and use the recommended amount. 3. Check the spray arm spins freely. 4. Switch the unit off and on and run a short cycle. If U1 returns, call us.

! Why to stop there

Siphoning and flapper problems need the drain path checked.
A motor or controller problem cannot be seen from outside.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other DishDrawer & Dishwasher codes

F9Fisher & Paykel DishDrawer Code F9: power supply or controller error F30Fisher & Paykel Built-In Dishwasher Code F30: flooding switch activated F40Fisher & Paykel Built-In Dishwasher Code F40: water flow error F50Fisher & Paykel Built-In Dishwasher Code F50: electronics error F90Fisher & Paykel Built-In Dishwasher Code F90: data or electronics error FA0Fisher & Paykel Built-In Dishwasher Code FA0: electronics or power supply A70Fisher & Paykel Built-In Dishwasher Code A70: temperature sensing alarm FFFisher & Paykel DishDrawer Code FF: top tub not responding

U1U1 questions

What does priming mean here?

The wash pump must fill with water before it can circulate it. If that does not happen within about three minutes of the fill valve opening, the controller stops and shows U1.

Can too much soap cause U1?

Yes, foaming is on the list of causes. Suds keep the pump from catching water. Use the right amount of dishwasher detergent and never hand dish soap.

When is U1 a repair call?

If the valve is open, supply is strong, detergent is correct and U1 returns, the pump path needs testing. We quote in writing before repairs and back them with 30 days.