Defrost timer.

Ken asked so the replacement for this defrost timer was the slow delivery item.
This is from the new fridge I bought and had become unreliable, only noticeable if its motor stalled whilst in the defrost stage but that stirs the panic button. I had put the old big fridge back into service after that happened, then diagnosed this as the villain. They're cheaply available on-line but usually with different timings so I ordered a one with switches that allows a setting close to it, and it's working fine again, well so far at least.
Now I have to try and persuade Olivia to change fridges again but that can wait.