VAILLANT ECOTEC VUW PRO 24 28 EXPANSION VESSEL 181051

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There should be one of these types of boiler filling loops under your Vaillant combi boiler, if not then it will be an external filling loop. Vaillant boiler filling loop closed This is a common fault on Vaillant Ecotec boilers and is caused by the expansion vessel losing its charge.

Leave the drain off open and pop the front cover off the boiler. Now don't touch anything except for the red expansion vessel down the right hand side, looks kind of like a metal hot water bottle!! Removable side panels and push-fit flue system - For improved accessibility and ease of installation If you have another brand of boiler and not a Vaillant, there?s a chance that recharging the expansion vessel may not fix the problem because the vessel has split internally. If this is the case, you would need to replace the expansion vessel, not just recharge it. This almost never happens on Vaillant boilers though. Faulty Filling Loop Letting By This is usually below the boiler but there could be an external flexible filling loop anywhere on the system, sometimes hidden away in cupboards or behind boxing. Yes. You can repressurise a Vaillant boiler by yourself, and you should definitely learn how to repressurise a combi boiler if you don’t already know.

If the bag is dry after your Vaillant boiler loses pressure overnight you must have a leak on the central heating system which will need to be found and fixed. You can do this via a drain-off valve. A drain-off valve can be on the boiler, a radiator valve or anywhere on the central heating pipework. Radiator drain off valve Here is my situation: I have a Vaillant Ecotec pro 28 combi boiler that is about 6 years old. It is stored in the loft of a 3-bed house and until now I've never had any problems with it apart from a small amount of pressure loss which is so gradual I only needed to top it up every few months or so. I do this using the 2 valves underneath boiler as instructed by a plumber friend. A couple of weeks ago I switched the heating on (after it being off all Summer) and since then the pressure has been dropping pretty much every night so that in the morning there is an F22 fault code and the heating doesn't come on. To get around this I have been adding pressure as before and then the heating works again. It’s meant to be the grey zone is safe but the bottom of the grey zone is so much different to the top.

PUMP, HIGH-EFFICIENCY (IF THIS IS THE REPLACEMENT PART THEN PART NUMBER 0010030691 - CABLE IS ALSO REQUIRED) The most common cause of a Vaillant boiler losing pressure is a leak, this could be on the boiler or anywhere on the central heating system. If it is below 1 bar, you should top the pressure up. If you have to keep topping the pressure up, you have a problem that needs to be fixed. If the pressure gauge is reading zero (or close to zero) your boiler needs to be repressurised to get it working.

Portable air tank for workshop use?

I then just refilled the boiler, vented it and tested the system. It?s a nice easy job that shouldn?t take more than an hour. What Else Can Cause This Problem? Split Expansion Vessel You might bet a Vaillant F83 fault code on some boilers when the pressure is too low. Expansion Vessel Problems From the factory they?ve got a 1 bar charge, but over time they lose it, which causes the pressure dramatically to rise when the heating is on. How To Fix It If you have to keep repressurising your Vaillant boiler you should get that problem found and fixed as soon as possible.

Having been reading various threads here and from watching the boiler this morning I think I have gotten close to the problem.Another cause could be the expansion vessel has lost its air and needs to be recharged or replaced. Open a drain-off valve on the Vaillant boiler or central heating system with a hose attached and let the pressure drop.