Loss of pressure in Combi boiler

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We have loss of pressure in Combi Boiler and stops working with a red light.
We had heating Engineer who changed the diverter but the problem still remains.
I have not noticed the fault code but I think it is F75.
Can anybody kindly suggest what may be causing problem?
I read several articles in forum but unsure what to do. Can anyone suggest an Engineer around Barnet area and how much would it cost as I have already paid £180. for just putting Diverter.
Many thanks.
Tanna
 
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Boiler make and model please.

I assume you are noticing a full pressure drop on the pressure gauge on the front panel, not just a loss of half a bar?
 
Boiler make and model please.

I assume you are noticing a full pressure drop on the pressure gauge on the front panel, not just a loss of half a bar?

Vailant ecoPro 28.

At present when I press - key it shows 1.6 and gauge is middle of green.

Hope this makes sense!

Thanks[/b]
 
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So the pressure on the gauge seems fine but the boiler is in lock-out showing an error code of .....possibly F75?
 
TeaTime";p="3348968 said:
So the pressure on the gauge seems fine but the boiler is in lock-out showing an error code of .....possibly F75?[/quote

Yes it shows F75 and red light is on and will need to fill up to increase the pressure. The heating will start working but the gauge will go into red area and drops of water will come out from copper pipe outside.

The system will work for fews days will stop with red light.
 
Sounds like the expansion vessel needs refilling / replacing IMO, but there might be some additional issues, which the boiler engineer will look into.

Not sure about the cost, but others can advise.
 
Hello, once again, the Boiler Engineer came back and filled expansion vessel with foot pump but after a while water was still dripping outside the wall and he replaced another valve, probably PSV, it worked fine for half a day and same problem occurred. Showing red light, increased the water level twice, it worked fine for few days and now have same problem, though pressure stays in middle (green area). Do I need new expansion vessel? Or there is something else.

Any help will be highly appreciated. Thanks.
:unsure: :unsure: :unsure:
 

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