Vailiant Boiler Keeps Losing Pressure

tp1988

Hi All,

We had a new Vailiant EcoPro 30 installed few days go, it was all working find providing heating and hot water. Today i keep getting F22 code, i have topped it up via the loop to 1.5 Bars but every few hours keeps dropping down to 0.4 or below. Cant see any leaks at the moment,

Any advice on what it can be causing this?

Thank You

roddydogs

Obviously contact the installer.

tp1988

Have done, office are closed till Monday, no out of hours contact details

neilmcl

Have you checked that all the radiators have been bled? Top up the pressure then go around and bleed the rads, repeat if necessary,

Jeepers_Creepers

Hi TP. Lots and lots of places it could be losing pressure from :-)

But I think it's pretty clear that unless it's something very obvious - a loose bleed screw or similar - you aren't going to be fixing it yourself? In addition, I wouldn't keep topping it up because if it is a leak from a hidden pipe, who knows what damage it could be causing.

williamgriffin

Is the overflow pipe dry?

Was any power flushing done before they put the new boiler in?

daveyjp

Check all the radiators are bled and the bleed screws are tight.  It only needs one not to be fully nipped up and pressure will be lost.

tp1988

Thank you all for your advice and suggestions.

neilmcl said:

Have you checked that all the radiators have been bled? Top up the pressure then go around and bleed the rads, repeat if necessary,

I have done this and it held the pressure to 1.2 and over 35 min dropped to 1.0

williamgriffin said:

Is the overflow pipe dry?

Was any power flushing done before they put the new boiler in?

Checked the overflow pipe and it is dry. No powerflush was done before the new boiler went. They said it was not needed.

Radaitor pipes  and valves are all dry.

Jeepers_Creepers

With respect, there's nothing else you can try - you've nipped up the bleed screws, and you've looked for visible leaks. There aren't any. And with greater respect, I think you'd be unlikely to try fixing it even if you ID'ed the hidden cause?

On a different issue, what warranty have you been issued with on your Vaillant? Have you looked at the T&Cs? Does it mention that a PF must be carried out and a magnetic filter added to enable the extended warranty? Is there a new filter?

tp1988

Thank you all for your advice and time, think the problem has been solved, 2 of the radiators(20 + years old) were bubbling at the bottom which was then leaking water. Have turned the valves off and the Pressure is keeping steady, the bar is at 1.8, is that too high? 

Jeepers_Creepers said:

With respect, there's nothing else you can try - you've nipped up the bleed screws, and you've looked for visible leaks. There aren't any. And with greater respect, I think you'd be unlikely to try fixing it even if you ID'ed the hidden cause?

On a different issue, what warranty have you been issued with on your Vaillant? Have you looked at the T&Cs? Does it mention that a PF must be carried out and a magnetic filter added to enable the extended warranty? Is there a new filter?

ill have a read at the T&Cs for the PowerFlush requirments, they did install a Scale reducer and a IntaKlean system filter.

Jeepers_Creepers

Pleased you found the cause.

Yes, 1.8 is a tad high, although not an issue medium term. But best if you bleed a different rad and bring it down to, say, 1.2 bar which is better for your whole system - less likely to blow old rusty rads

I'm a bit concerned at the lack of system cleaning, tho'. The two rads that are leaking have almost certainly corroded through from the inside, which means that there will be sludge in your system.