Whirlpool ADG 7540 - error 4 - help please

[turbo123]

Hello,

I have a Whirlpool ADG 7540 dishwasher with an error code 4 flashes.
Cleaned filters and diaphragm switch.

Does not run wash cycle

Water drains ok.

When the spray arm is removed (in wash cycle) you see the water pulsing up and down – about ½” to 1”

Could the problem be the circulating pump / motor?
Does the pump / motor need replacing or can you change the brushes?

I was going to try and by-pass the diaphragm switch to rule out the switch,
But not sure what voltage is used for the diaphragm switch or if that would be possible? Would just switch manually when in wash cycle.

Could I just remove the diaphragm switch and test with multi-meter?

Thanks,

Turbo.

 

[turbo123]

Removed the circulating pump / motor and found piece of plastics that could have been stopping motor running, but when I put back together I now have error code 6 flashes – any ideas?

Thanks,

Turbo.

 

[turbo123]

Ran diagnostics without failing (did not wash),
Checked error code – now 7 flashes

 

[turbo123]

Looks like it is failing,
F1 – F2 – F3- F4 – F5 – F6 – F7

 

[zipper]

It can't be showing every single error between F1 & F7...unless your pcb has thrown a wobbler. F4 (4 flashes) is a drain issue. F6 can be caused by a kinked/blocked inlet hose, tap closed, or a defective flowmeter. F7 usually points to a bad contact on the flowmeter or a defective flowmeter (but can also be caused by the same issues as F6). Plastic shards in the wash motor may be a sign of a damaged impellor (new wash motor required).