Whats the 428?, is that the glow-worm hxi?. Never been able to tell the difference between one vaillant and another as they call them all virtually the same thing.
Had jerry rigged the pump to a switch so that I could at least get some hot water - not entirely ideal but needs must (an all manual op - timer was switched off)
When i came back to measure the voltage this morning - nice 250v supply going to the pump.
The only thing that's been touched is the green pump connector - so i suspect there's a dry joint on the connector.
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