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Diplomat dishwasher fault codes and spare partsFault or error codes used in dishwashers produced by Smeg for Diplomat and Hygena that were sold by MFI. These dishwasher were almost always integrated models with a cupboard door on the front of them and the LEDs on the top edge of the dishwasher door although the same codes may apply to other dishwasher models.

These dishwasher fault codes will displayed as a digital code, exactly as you will see below, in an LED or LCD panel or display on the dishwasher door. The lights will be flashing or lit as shown giving you the fault code.

Before you start any investigation of the fault or open up your Diplomat dishwasher please read and fully understand this article in full and pay particular attention to the safety and information notices at the bottom of this page as they contain extremely important information!

Please remember to support our site by buying spares from our spare part store here and, if you decide that you really need an engineer please support the local repairers that help make this site possible, you can search for a repairer from the link below.

  Diplomat Dishwasher Fault Codes

Like other fault codes these written for dishwasher repairers and not for the general public by Diplomat and they assume a certain level of competence on the part of the user in diagnostic routines. We may have added some notes to try to assist you in determining the nature of the fault you have but, you will still need to investigate each failure on its own merits. For more help and advice on fault finding on a dishwasher please refer to our basic dishwasher fault finding guide from this link before you begin.

Please check that any Diplomat dishwasher spares recommended are suitable for use on your particular model and production code or serial number. If you are unsure about the suitability of any spare part please ask to ensure that you get the correct spares for your Diplomat dishwasher. Please, don't guess or assume as spares can be altered on a production run with the same model number having several different alternative components used.

  Fault Code Lights Legend

This is our very simple legend to show the state of the lights, lamps or LED's as they are unlit, flashing or lit continuously.

Light or LED not lit Light or LED flashing Light or LED lit solid, no flash

  Diplomat Dishwasher Fault Codes

Flood protection system activated (E1 & E9)


Safety pressure system activated (E2)


Failed to heat in allotted time (E3)


NTC (temperature sensor) error (E4)


Failure to fill with water (E5)


Failure to drain in time allowed (E6)


Flow meter detected when not fitted, reset required (E7)


  More Dishwasher Help, Advice & Guidance

Should you need more help and guidance please use the links from this article as most of them will help you to understand your dishwasher a lot better and probably very much help you in diagnosing the fault you have. Of course there are many other articles on the site that will also help you do this.

In addition you can post in our help and advice forums after registering but please do pay heed to the information below before doing so and read the guides, they are there to help you. But if you are in any doubt at all or don't think you are up to diagnosing the fault yourself please use our engineer search to find a local dishwasher engineer.

You must understand certain things before you begin or attempt any repairs on your own and we want to make these points very, very clear to anyone that decides to investigate one of these or any other dishwashers:

  • We are not responsible for your safety, you are and by using this guide you accept that and accept that any damage that you may cause and work undertaken is entirely at your own risk.
  • We will advise the common causes of the fault codes but we cannot guarantee that any parts or work recommended will resolve the issue. It is entirely your responsibility to diagnose your particular problem and resolve it.
  • We are not responsible for you buying spares that do not resolve the problem, this is down to your own diagnosis not ours.
  • No warranty is inferred, implied or given.

Be aware that these Diplomat dishwasher fault or error codes are not a "magic bullet", they will not tell you what the problem is, they will only offer you an indication of where the problem lies and they are no substitute for diagnostic skills. You can find out more about what fault codes actually tell you in this article. So please be well aware that, even with this new found knowledge you will still have to actually be capable of investigating and diagnosing the problem and this means adhering to basic appliance safety for working on them.

Please do note that manufacturers can and do change fault codes without notice and we cannot guarantee that these error codes will apply to your particular model as all codes apply to a wide range of appliances and not normally any one specific model. To determine if these fault codes do apply to your particular dishwasher model please post a request to confirm this in the forums.

  Diplomat Dishwasher Service Notes

From an older article:

Smeg dishwashers (and these Diplomat and Hygena integrated dishwashers) utilise the five programme LEDs to indicate faults. A combination of the first four lamps will flash and lamp five will be lit and steady. A basic interpretation of these codes will be found in the user manual.

There are four circumstances which can cause spurious lights on the control panel.

The various culprits which can cause this error

  Diplomat Dishwasher Mains Suppressor

These have a habit of blowing up, but still allowing power into the machine. As a consequence, they generate electrical noise which can cause corruption of the computer board. If you are lucky, replacing the suppressor will set the PCB to rights. There are two types of suppressor, one is a plastic cylinder on a metal frame in the back corner, the other is a plastic three lead cylinder in the front left of the wiring loom, under the tub.

  Diplomat Dishwasher Soap Dispenser

This device is operated by a solenoid on the inside of the door. Over time, the solenoid can deteriorate internally; it also suffers from dampness and dodgy wiring connectors. As above, replacing the dispenser may restore order.

  Diplomat Dishwasher Computer Board Or Programmer

They do go wrong, simple fact. Occasionally there is visible evidence of blown tracks and burnt connections, for instance. Often, they simply stop working.

  Diplomat Dishwasher Door Lock In Door Closed Position

Occasionally, the door switch can be faulty or the door lock itself jammed in the door closed position (although the door is in fact open). This may cause spurious flashing lights and cause the programme buttons to become inoperative.

The conclusion to be drawn from the above is that there is no simple, sure-fire way of diagnosing problems on these machines. They are technically complex and replacement parts are expensive. Many repairers will carry the suppressors and dispensers as stock items, allowing testing by substitution. This is not a practical option for the home repairer guessing is an expensive way of repairing an appliance.

If you wish to carry on with the diagnosis, remember, power off for anything other than observation.

Diplomat dishwasher fault
Hi I have a diplomat adp8322 and it has stopped working. I wonder if anyone can help?
It has power until I try and close the door and then the lights go off with no power at all. There is a little click when I open it again and the lights come back on. Any ideas?

Margaret Dick
Fault code
Dishwasher is 10 years old. Stops at rinse and shows fault code F4. What is this? Not trying to repair myself just want to know what it indicates.
Frances kay
Diplomat integrated dishwasher model adp8342
I put a little hand dish detergent in by mistake
Run a cold rinse only cycle a few times and hope for the best is all you can do.
Dishwasher starts but we hear a clicking sound and water inst filling properly
Monica Martin
My Diplomat dishwasher runs continually regardless of which cycle is used.
Glenda Bennett
J leahy said :
All lights stay on on control panel. I can't choose a programme ax they all light up when I power up please help.
J leahy said :
All lights stay on on control panel. I can't choose a programme ax they all light up when I power up please help.
All lights show up when I switch on so I'm not able to choose a program or get the dishwasher to work..please help

Mrs Dawn Clay
Hi, I own a Diplomat dishwasher which is approx 10 years old. It has stopped working showing an error code of a diamond with a 1 inside the diamond shape. Can you help me with what this error code is please. Many thanks x
my diplomat adp8322 dishwasher has no error codes ,when i switch it on it stops after 3- 4 minutes.
Julie Grogan
All lights stay on and can't get it to do anything.Model Diplomat is ADP8132thank you

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