Had the varistream about 4 years been fine but just packed in. Just not turning the pump on. The green light comes on and just flashes. By passed controller and pump works. Any ideas
If it is a Varistream then the green light flashing is a flat battery according to the Varistream instructions. The green light constantly on is the pump running.
So if possible swop the connections onto a good battery - ie van battery and see if this solves the problem. It could also be a poor/bad connection somewhere from the battery to the Varistream. Suspect a bad connection at the fuse holder, cable joins or at the battery. It could also be a problem on the black neutral back to the battery.
The battery may still have had enough current in it to run the pump, but the Varistream has a low voltage cut-out at 10.4v (or somewhere there abouts on older units) to prevent 'killing' the battery.
If you have a split charge relay connected, will running the engine solve the problem? If so then it's most likely to be the battery being flat.