When my last variflow packed up it just went with no warning. I was at one customer and it was working fine. Got to next customer - nothing. Went home and put a meter across it and there was no output voltage. This is Friday with a whole day to do and work booked in for the weekend.
Phoned my usual supplier, no we are waiting for them to come in. Phoned another supplier to get the answerphone.
So I phoned Williamsons the manufacturer, I was prepared to drive to Sussex if need be. They said a new batch was due in any day. This was no good for me, but they gave me the name of someone else who it turns out had several. Nearer as well.
So when I went I bought two. My pump is two years old so I bought a spare pump at the same time. An expensive day but a lesson learned.