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Hiya, If he's an electrician and not a Whitegoods engineer then you've firstly go the wrong person in to look at the appliance. Get a tube of high temp sealant. Take the door off the appliance. Take the door apart so you can work on the inner door only. Take the glass off, clean off all the...

Your repairer is talking rot. Whirlpool have always supplied end user pcbs. Blanks were used by Whirlpool engineers who could write the software to them on site. I know because I'm ex Whirlpool

You don't need a pcb. Don't know who told you you did but it's 99%certain you don't need it. 4 flashes is a drainage failure. Get a kettle, fill it and while it's boiling take out the fine filters in your machine. Once it's boiled, pour it into the sump of the dishwasher getting as much...

Yep, model and serial number would help. Might be able to find the pcb for you then.

Hiya, ADP8322 is a Whirlpool appliance. What was the original problem? What is the part number of the pcb?

Check the top spray arm pipe is locating properly at the rear of the basket.

start light should be flashing. count the flashes.

3 flashes is a heating fault. NTC, heater or main pcb.

You haven't provided the product number or serial number so have to guess at the age. Continuous flash is a single flash. Single flash is error code F1 which is an NTC fault. NTC regulates the temperature. It's fitted from the underside, twist fit and has two thin blue wires going to it.

4 flashes is a draining failure. something stuck in the pump or a blocked drain hose.

Water hammer is a common fault of the inlet valve. You've pretty well understood how it should work. Take the side panel off and watch whats happening. If you manually activate the pressure switch water should stop, release it and it should take in water again.

Intermittent heating can be a dry joint at the heater relay on the pcb. However, if there's not enough water, it won't heat. Water level is controlled by the pressure chamber.

faulty inlet valve, not closing, or faulty main pcb.

As far as I remember the issue is a lack of water in this machine. If the transfer pipe is clear then the pressure chamber would be the next item to check.

Its easier if you stick to one thread. We need the enr number to see what appliance you have. If you post the enr number and the fd number I'll be able to look up the exact machine you have. That'll maybe help diagnose the fault.

The metering tank to sump hose will be blocked (if you're lucky it won't have blocked the rest).

The alternating valve is fitted between the circulation pump and the pipework feeding the spray arms.

Whirlpool machine rebadged. 4 flashes is a draining failure. If it's draining ok then the fault will lie with the water indicator (pressure switch) or main pcb.

Well documented failure. Use the search facility and search for Whirlpool and 4 flashes.

Something stuck in the pump?