I have UK vaillantboiler displaying f.72 fault code.

[Nevermind5]

I have UK vaillantboiler. This morning it was displaying f.72 fault code so I restarted the thing a few times and that went away but now there is 0 pressure and I can't seem to figure out how to repressurise it and also the f.72 code has returned.

I have looked online and all or most of the say there will be 2 taps to depressurise and repressurise them but I can only find the one to depressurise it. Any suggestions to help please. There is no hot water or central heating.

There was an f.22 code there yesterday but I have topped up the gas meter yesterday and the boiler worked fine until I turned it off for the night. Would it help to repressurise it first before trying to sort the f.72 fault code out?

Images of the boiler underneath and above it - https://imgur.com/a/IqlT3yK . The tap I've mentioned is circled in yellow. The electrical display doesn't display that now, it displays f.72 a while after I restart it.

 

[Gasguru]

Bit of a lash up there...
Whatever you do don't touch the tap in yellow...that's the safety relief valve.
Have a look in the airing cupboard....top up no more than 1 bar.
When was that red vessel last checked for air pressure? The valve on top looks inaccessible even with a right angle connector...can it be pulled out on the flexi hose?
If so it's worth checking the pressure first...see the FAQs.

 

[Nevermind5]

Bit of a lash up there...
Whatever you do don't touch the tap in yellow...that's the safety relief valve.
Have a look in the airing cupboard....top up no more than 1 bar.
When was that red vessel last checked for air pressure? The valve on top looks inaccessible even with a right angle connector...can it be pulled out on the flexi hose?
If so it's worth checking the pressure first...see the FAQs.

I'm sorry, I'm a complete novice here, this is a new flat I've recently moved into and the flatmate is not currently here and I doubt she will know what to do with this either.

The tap in the yellow has already been touched, that seems to release any pressure that is in there. The red vessel you refer to I assume you mean the smaller red item in these photos https://imgur.com/a/mvj6hcm . I do not know when that was last checked for air pressure. When the boiler is on and I restart the boiler that red item/vessel runs quite loudly, it doesn't usually make noise.

Also a little while after the boiler is restarted the pressure gauge starts to go up quite quickly but then it stops and drops back down to 0.

It looks like the flexihose can be disconnected but with tools unscrewing it.

I have checked a cupboard with a large tank in it which I assume is to store hot water, I cannot find anything resembling taps used to control the pressure.

Many thanks

 

[Gasguru]

Best to stop doing anything else....you're causing more damage, turn the boiler/heating system off.
Is this a rental?

 

[Nevermind5]

Best to stop doing anything else....you're causing more damage, turn the boiler/heating system off.
Is this a rental?

Noted! It is a rental, I have someone coming to fox it tomorrow, thanks for the the advice.

 

[Gasguru]

You'd better confess to playing with the safety valve otherwise the pressure will drop and another visit will be required. I'll never understand why people play around with heating systems when they don't have the knowledge and then cause more damage.