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No central heating...new boiler

You shouldn't be blowing fuses get the port valve installer back as for a 3amp fuseto blow it's pulling around 4-5 amps which isn't good when most things are rated for 2-3 amps boiler 1 amp
As for the port valve , does that little switch at the top go side to side as per water or heating requirements?
 
I contacted him this morning he's in Wales, have asked another engineer to come on Friday . The only electrical parts the second installer touched is to install a new room thermostat, on original wiring (is this ok), new timer and sort out the spaghetti junction wiring.

In your orginal post you say the 3 way (port) has been replaced and you happen to know the model so it should be that installer that returns to correct it. Another engineer might justifiably say I'm not touching it but having said that Screwfix have a no quible returns policy so you should be able to get a refund or swap for a new unit.
 
In your orginal post you say the 3 way (port) has been replaced and you happen to know the model so it should be that installer that returns to correct it. Another engineer might justifiably say I'm not touching it but having said that Screwfix have a no quible returns policy so you should be able to get a refund or swap for a new unit.
Not sure it was that exact model, I do remember it was a flomaster, ill be abke to confirm exac model number when I get home, if the rain hasn't destroyed the box. Are flomasters notoriously bad?
 
Not sure it was that exact model, I do remember it was a flomaster, ill be abke to confirm exac model number when I get home, if the rain hasn't destroyed the box. Are flomasters notoriously bad?

It's got some very bad reviews on Screwfix site, especially the ones off engineers/plumbers a number of whom have replaced it with Honeywell ones not long after installing. There's a reason they're so much cheaper.
 
My guess would be wrongly wired from day one and your engineer has just redone what was there. I bet if you pop the head off the new one the fuses stop blowing
 
My guess would be wrongly wired from day one and your engineer has just redone what was there. I bet if you pop the head off the new one the fuses stop blowing
He tidied up the wiring in the junction box in the airing cupboard, he said it was a spaghetti junction. Could well still be wrong perhaps?
 

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