Pressure drop + difference between boiler and in-house guage

[Kilburnlad]

Vokera Mynute 20e boiler on pressurised system. Installed in (new) house for just over a year. Four-bed house with 15 radiators.

Pressure drops off over a number of weeks but this first happened after a year in use. Have read posts suggesting minor leak. However, in addition to the pressure gauge on the boiler (in garage) there is one by the hot tank, which is on opposite side of house; this is where the pressure recharge connection is situated. These gauges show different pressures - the in-house one is currently just under 2 bar, and the boiler one is 1.1 bar. The boiler cuts out below 1 bar, which has happened a couple of times this year.

Besides the pressure drop-off, any ideas on why there should be a pressure difference?

 

[ChrisR]

Yes. Those small guages are Krap. Often the first 0.5 bar doesn't register, or reads 1 bar. SOunds like the boiler one is reading high, because the switch-off aty low pressure usually comes down around 0.3 bar. DP will be familiar withthe model.

Leaks often occur at rad valve stems, where dampness evaporates so you don't see it.
Always worth checking the pressure relief pipe is dry, too.

Dropping pressure every few weeks isn't tooo bad, but make sure your corrosion inhibitor strength is kept up as you're introducing fresh water/oxygen when you top up.