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Discuss Valiant eco etc pro pressure problem in the Central Heating Forum area at PlumbersForums.net

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4
hi, I’m hoping someone can give some advice. My boiler keeps giving a error message of f75. I have replaced the expansion tank and it has been repressurised but what happens is the boiler will work then the red light comes on with error message the only way the boiler comes on is to send more water into the system which makes the pressure higher, the boiler will then work and it goes off again so the boiler ends up with the pressure being too high and I guess it discharges water out of the pressure release I fill it up again too high so the boiler works and round we go again. Anyone got any ideas? The tank is pressurized as I have done this a couple of times just to make sure! Thanks everyone
 

Riley

S. Mod
Plumber
Gas Engineer
Messages
10,783
Firstly are you gas safe?? If not you should not be removing that cover as it forms a combustion seal protecting you and your family from anything nasty the boiler could throw out.
F75 is a common fault on these but you are going to need a gas safe engineer to remedy it
 

king of pipes

Esteemed
Plumber
Gas Engineer
Messages
5,179
As above not a expensive fix but you will need a GSI to carry out the work at worst £300 . Kop
 
Last edited:
Messages
4
Hi, no I wouldn’t know what to do, but it cost me a small fortune replacing the tank the engineer said that would be fine which it was for a couple of days. I now keep filling up the system making the pressure too high to make it work and want ideas of what it is before a end up paying another few hundred on something that might not work so am after a list of possibilities so I can go to an engineer to get quotes, don’t want to be ripped off, any ideas would be great!
 

Riley

S. Mod
Plumber
Gas Engineer
Messages
10,783
Just get three quotes mate. Or go with Vaillant fixed price repair. I’m afraid you won’t get any specifics here. Not being awkward just safe
 

rpm

Esteemed
Plumber
Messages
12,552
Don`t buy the parts or do any work yourself then if it still doesn`t work after a repair you call the man back.
 
Messages
4
Yeah no worries, I got two quotes last time and after paying out it still has exactly the same problem, thought there might have been a specific solution, thanks anyway
 

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