Hi everyone.
This summer, I fixed a leak on a towel rad and had to re-charge the CH system. A couple of days after this, the boiler lost pressure and generated fault code f22. I also noticed water on the floor below the boiler and found a drip forming on the PRV pipework just below the boiler. The PRV'S external lock nut surprisingly was loose (around half a turn needed to tighten it). The boiler was OK for a couple of days, then again lost pressure totally. There was no water below the boiler, but I could see that the PRV must have activated as there was a water mark at the external outlet of the PRV pipework outside. I found that the filling loop had been leaching water into the CH system - the flats in one of the plastic taps had rounded, so while the tap was 90° and showing closed, the valve hadn't totally closed and was slowly passing water. I remade the flats in the plastic tap, recharged the CH and the boiler seemed fine for the rest of the summer.
With the recent cold snap, the wife set the CH timer... . Now, when the CH is called for, the boiler heats over a period of several minutes, with the pressure rising from 1.0 bar to 3.7 bar, at which point the PRV opens and empties the CH system, generating fault code f22.
As the boiler works fine for DHW, would I be right to suspect that the previous over pressurising has compromised the CH system with the PRV needing to be replaced, or is there more to it than that?
Your advice/recommendations would be greatly appreciated.
Antony.
This summer, I fixed a leak on a towel rad and had to re-charge the CH system. A couple of days after this, the boiler lost pressure and generated fault code f22. I also noticed water on the floor below the boiler and found a drip forming on the PRV pipework just below the boiler. The PRV'S external lock nut surprisingly was loose (around half a turn needed to tighten it). The boiler was OK for a couple of days, then again lost pressure totally. There was no water below the boiler, but I could see that the PRV must have activated as there was a water mark at the external outlet of the PRV pipework outside. I found that the filling loop had been leaching water into the CH system - the flats in one of the plastic taps had rounded, so while the tap was 90° and showing closed, the valve hadn't totally closed and was slowly passing water. I remade the flats in the plastic tap, recharged the CH and the boiler seemed fine for the rest of the summer.
With the recent cold snap, the wife set the CH timer... . Now, when the CH is called for, the boiler heats over a period of several minutes, with the pressure rising from 1.0 bar to 3.7 bar, at which point the PRV opens and empties the CH system, generating fault code f22.
As the boiler works fine for DHW, would I be right to suspect that the previous over pressurising has compromised the CH system with the PRV needing to be replaced, or is there more to it than that?
Your advice/recommendations would be greatly appreciated.
Antony.