VAILLANT ECOTEC VUW PRO 24 28 EXPANSION VESSEL 181051

Product Information

Recognised Grundfos high-efficiency pump - Modulating high-torque pump uses low energy to deliver a balanced output to meet the boiler demand, helping to reduce energy consumption Removable side panels and push-fit flue system - For improved accessibility and ease of installation Having been reading various threads here and from watching the boiler this morning I think I have gotten close to the problem.

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. I'm no expert at all but from reading lots it points to the expansion vessel either needing a recharge or is failing/failed. I see that you can test the Schrader value for water. I also read that vessels last around 10 years, which if true means we're fairly close to it. PUMP, HIGH-EFFICIENCY (IF THIS IS THE REPLACEMENT PART THEN PART NUMBER 0010030691 - CABLE IS ALSO REQUIRED) Another cause could be the expansion vessel has lost its air and needs to be recharged or replaced. 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.

vaillant turbomax - expansion vessel + valve

This is most likely an expansion vessel problem, if so, you will need to recharge it or replace the expansion vessel if the diaphragm inside is split.

High-quality heat exchanger - Stainless steel heat exchanger designed for long life and easy maintenance This is a common fault on Vaillant Ecotec boilers and is caused by the expansion vessel losing its charge. The pressure on a Vaillant boiler should be between 1 and 1.5 bar when the central heating is off and the radiators are cold. Correct Vaillant boiler pressureSee pic below: This is the expansion vessel that loses charge. I pumped it up from the Schrader valve to solve the problem. If your Vaillant boiler is losing pressure overnight you will have a leak somewhere on your heating system or the pressure relief valve is letting the water out. If the pressure gauge is reading zero (or close to zero) your boiler needs to be repressurised to get it working.

The pressure rises when the heating is on, so you will not get the proper reading until it has cooled down. It’s meant to be the grey zone is safe but the bottom of the grey zone is so much different to the top.If you need to repressurise your Vaillant boiler often you have a problem that you need to get fixed. Controls compatibility - The wide range of Vaillant room thermostats, wired and wireless controls including the vSMART™ app-based control with weather compensation to lower running costs for tenants The system pressure kept going really high when the heating was on. But when the heating cooled down, the pressure went really low and caused an F22 fault. What Causes Boiler Pressure To Go Really High Vaillant boilers are sometimes undersized when fitted and are not large enough to cope with a large house’s central heating system. However if the system is under pressure then my understanding is that of course water would come out of the air valve and the person doing the job is trying to con me into getting unnecessary work?

When opening the drain point do you need to open all valves up on the rads and then open the bleed valves or can you just literally open the drain point and draw off 10 litres and then shut off the drain? If the pressure drops, it means the water is getting out which should not be happening. Low pressure on a Vaillant boilerCompatible with aroTHERM air-to-water heat pump hybrid system - Making the perfect entry into renewable systems If you have to keep repressurising your Vaillant boiler you should get that problem found and fixed as soon as possible. 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