That error code means there is an issue with the drainage pump or over flow sensor and there is still liquid in the bottom of the dishwasher. Please fund the info that I have sauced from the Haier service support centre for technicians

Code:E30

Description:Overflow Alarm

Cause:

1.The drain pump does not work
2.Water is in the bottom tray
3.The overflow switch failure
4.The connecting failure
5.The overflow switch is assembled on incorrect position
6.The mainboard failure
Simple Solution:
1.Replace the mainboard
2.Check the leakage position and then reassembly it or replace the leakage component and record the leakage reason
3.Replace the overflow switch
4.Reconnect the harness
5.Reassemble the overflow switch
6.Replace the mainboard

These are not full steps you have to take but more guide lines for service techs that come to your house to do repairs.

If you still have warranty, call Haier and they will send a fisher and paykel service tech to your house

Hope this helps.

thank you

Water leaking from the door would indicate that there is an issue with the door seal. This could be from a damaged seal to even something being in the way of the seal and allowing water to escape. I have looked up codes for this model as I have one and I was curious but there is nothing within the manual. A very long call to Fisher and Paykel are also known Haier as they seem to have one staff member working their call centres for Australia and New Zealand. The result was a flow meter error which also could be why water is leaking out the door. This error could cause the unit to overfill.

If you haven't in the past, clean the spray arms, filter and mesh bottom. The run a heavy wash with a finish Dishwasher cleaner and run the unit. This issue could result from a Control panel error to sensor error and if it is just the sensor, I hope there is just some grease built up and the cleaner hopefully will clean it away. This is in no way a fix if there is an issue but just what I would do before replacing or getting the unit repaired.

Furthermore, I recommend doing the finish clean once a month with normal use or more often with heavy use. I also recommend not using short cycles and either using Auto or heavy cycles.