So far I tried adjusting the gas valve, tried new fan and electrodes. PCB is been changed by another engineer. No fault code. Am I missing smth? Usually vaillant are easy to fault find. Could have fit new boiler by now.
Having a bit of an issue with above boiler. Boiler fires up till reaches 40-50 degrees then it just stops, no fault code. Seems like it's not modulating. Turned it off and on again and it does the same thing. Can anyone shed any light? Cheers
Boiler fires up for 5 min then pump keep running for long time then randomly fires up again. Flow pipe only gets warm not hot. New pump has been changed thinking is circulation issue. Powerflush or new Pcb???
I'll check the stat readings from Baxi. Does anyone think that doggy resistance in the pump would affect the PCB? Pump doesn't look in good conditions, it's seems to run thou
As Dave1 mention before, I would pressurise the boiler and isolate flow and return and see overnight if it drops pressure, then you know if you're losing pressure on the boiler or the system. I had this on Remeha boiler before, it was a split heat exchanger.
I contacted the Viessmann and to be honest they were willing to deliver one next week but costumer needed heating. The safety valve come separately from the boiler box , it was plumb nation who lost the item when they delivered.
Recently I ordered a Viessmann 35 storage combi boiler. The advertised boiler on PlumbNation says 1-3 days delivery - I waited a week. When it eventually arrived, it had the safety valve missing.
After contacting them on several days, they seemed to have no idea what a safety valve was and...
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