Valliant EcoTech High Pressure

[Sinjuns]

Hello. I am a homeowner and have a Valliant EcoTech 835 (2017). Serviced every year and worked like a treat until about a few months ago when I notified the pressure reading was too high (> 3 bar). My plumber came and did a regular service and told me the boiler is in tip top condition. The pressure remained high upon inspection. To relieve, I use the radiator valve to remove some water. I am then told that I need to replace the expansion vessel and PRV. Both done. Pressure was ok for about a week then started climbing and now is again consistently >3 bar. My plumber now tells me I need to replace the Pressure Gauge Sensor. Just wanted some advice from the experienced heads here. Am I going down the right path or should I be looking at a different solution? Thanks

 

[Gasmk1]

1 is filling loop passing.
2 if it’s a combi could be a breach between the plates on plate heat exchanger.
3 Vaillant pressure sensors tend to get clogged up so either stick on a reading.