Fisher & Paykel DishDrawer Code U4: other drawer has an error

What U4 means

On Fisher & Paykel DishDrawer DD605 and DS605 double units, U4 is advisory only. It tells you the other drawer has an error and has disabled the power supply. The Heavy and Fast LEDs show the pattern. The drawer showing U4 is not the one to repair: the problem is on the other tub, and that is where diagnosis and repair must be done.

Common causes of U4

An error on the other drawer that disabled the shared power supply
A flood, motor, heating or lid problem in the other tub

✓ One safe check you can try

1. Look at the other drawer's display or LEDs for a code of its own. 2. Switch the unit off at its breaker for one minute and restore power. 3. Note any code on the other drawer and call us. 4. Do not keep restarting the unit.

! Why to stop there

The real problem sits in the other drawer.
Treating the U4 drawer will not clear it.
Our technician puts the price in writing before any work begins and backs the job for 30 days.

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.

→Same appliance

Other DishDrawer & Dishwasher codes

F4Fisher & Paykel DishDrawer Code F4: no temperature rise while heating F5Fisher & Paykel DishDrawer Code F5: lid motor current too high F6Fisher & Paykel DishDrawer Code F6: lid motors did not reach stall current F7Fisher & Paykel DishDrawer Code F7: no lid motor current detected F8Fisher & Paykel DishDrawer Code F8: ground leakage detected 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

U4U4 questions

Is the drawer showing U4 broken?

Probably not. U4 only advises that the other tub has an error and has turned off the shared power supply. The drawer showing U4 is following that instruction.

How do I find the real problem?

Look at the other drawer for its own code and note it. We use that code to decide what to test, and we repair the tub that caused the shutdown.

Can I keep using one drawer?

Not while U4 is showing, because the power supply is disabled. Once the other drawer is repaired, both work again. We give a written price first.