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I have error code f 75 on vaillant eco tec. have upped the water pressure and still code appearing, boiler wont lite

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  • Anonymous Mar 15, 2009

    It appears to be a manufacturing defect! There are a lot of people, including me, with the same problem within the first two years. I intend to inform Which? and the Watchdog.



    The installer did warn me about problems with the switching valve/pressure sensor but I thought of economy and chose the Vaillant!!

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Got a f.75 on boiler have to put pressure up to 2.0 bar before it starts


I take it this is a Vaillant EcoTec boiler? If your having to pressurise to 2.0 before the F75 goes, there's a strong probability there's a problem with the water pressure sensor. These can sometimes just have dirt/sludge in them, and can be cleaned, however a lot of the time they just need to be replaced. F75 can also mean there's a circulation problem through the boiler, and you will get the same fault code. If you have the old rubber hoses on the flow and return pipes, these can be prone to blocking/restricting and Vaillant have actually modified this part whereby by the pipes are solid copper.

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Hi my vaillant eco tec pro shut down last night showing fault f.28 and will not ignite today 08/01/2010 looked out side to see the condenser pipe was frozen i defrosted the pipe but boiler still wont...


Got exactly the same problem with mine. Manual says f28 = fault in gas supply, gas pressure too low. Boiler will ignite but goes out within minutes? HELP!

Jan 08, 2010 | KDS Valiant 6380iPTD-01 Notebook

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Hi Guy's,
The answer is that your system is out of water pressure.
Usually there is a nob on the right under the base of the unit near to the small dial to the right of the front cover.
To enable the system to work correctly the needle on this dial should be in the Grey, about midway position.
Currently with fault F22 this will be lower to below the Grey and on the needle.
To bring the pressure back to the correct position, you need to turn this nob until you hear the water entering the system, KEEP AN EYE ON THE DIAL AND TURN THE WATER OFF AGAIN WITH THIS NOB ONCE THE DIAL IS IN THE CORRECT GREY POSITION AS MENTIONED ABOVE. DO NOT OVER FILL THE SYSTEM. I suggest you check this every six months or so.
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Best of luck. Mike. N.

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IF the weather is extremely cold, and you're getting F28, the external pipework may be blocked with ice. Warm up the external pipes (lag them if you can) - and now see if your boiler will re-ignite.

A friend fixed our condenser boiler with this tip - hope it helps you.

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two pipes coming into boiler on right hand side have brass block valves with a small round recess. These two valves are linked with a stainless fill hose.

Inside the recess on each valve is a small slot, there is a "key" with the boiler but prob lost with the manual. The advantage of the key is its sized so you wont be poking it in the wrong place!

Using a screwdriver turn both slots throug 90 degrees, you will hear water running through. Sometimes one valve is left open so try a combination until the watert runs.

Keep an eye on the pressure gauge and dont let it get too high, if you have no idea of setting pressure head for about 1bar.

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