Also check that the hot water is set to a reasonable temperature. Engineer changed the PCB , Fan & 3 sensors. Also when its playing up it tends to wait until I am in the shower with my hair wet, then it goes freezing cold, when you go down to check the boiler the light is flashing again and you have to press the red button or wait for it to restart itself. However, since the wind has died down its worked fine and the rads are so hot you can't touch them and it doesn't switch off once!!!! Header tank valve replaced, noise diagnosis help! for 11 years. I have a Worcester Bosch Greenstar 30CDI combi boiler - 3 years old and obviously out of warranty :( Although the heating works fine, I have an intermittent fault where I lose hot water. Take care not to mistake condensation for a leak. You are using an out of date browser. The problem was cold water being forced down the hot water side. The water pressure for a standard domestic boiler is usually around 1.5 bar and will be displayed on a gauge known as a ‘Manometer’, usually located where the water supply pipes are connected to the boiler. Worcester Greenstar 30CDI Combi - intermittent hot water. Depending on the type of boiler you have, the first sign that your boiler is not working will often be a change from the usual display colour along with an error code. I checked the boiler (Vaillant EcoTec approx 7 years old) and discovered the pressure had fallen to … Hot water goes cold(usually when in the shower!) Remove the cover of the boiler and run hot water tap. Use our FastTrack service to get your new boiler installed hassle free. The first thing you could check is that your boiler is receiving the power it … It’s true that in most cases boiler leaks are caused by corroded pipes and hot water cylinders, which become brittle and gradually degenerate. This was on a Worcester … Boiler is giving hot water. Oil Boiler that is ideal for heating large spaces up to 3,000 sq. It seems to be worse when the weather is bad. Worcester boiler problems with heating are often evident through the temperature of the water coming through your taps or within your radiators. However, there are two sides of coin to think about: This may have been affected by the clocks changing, power supply, back-up batteries failing or even somebody altering the settings without you knowing. Something is restricting the amount of hot water and the constancy of hot water leaving the boiler. Important: Be sure to consult the operating manual first to ensure that you are able to re-pressurise the boiler yourself. Expert: Andrew Smith replied 3 years ago. Gas Safe Register | Ensure your gas engineer is registered. When does a new boiler need its first service? Leaks often occur at joints in pipework which are usually visible, so these are a good place to start. This guide will help you to identify and solve common causes for hot water problems. Touch the plate heat exchanger at the back of the boiler. Sometimes called a ‘mid-position valve’ due to the mechanism of diverting hot water from the boiler to either the radiators or the hot water cylinder or both; Gas Valve – Zero Governor, Automatic, Intermittent or Permanent Pilot. Hearing a strange rumbling noise similar to when a kettle is boiling? The boiler is a Worcester-Bosch Greenstar 25si, if that's of any use. You can usually identify if your boiler’s pressure is too low by taking a look at … Some boilers may have a timer to control the hot water. If your pressure is below the normal operating range, follow this guide to re-pressurise. http://www.ukplumbersforums.co.uk/central-heating-forum/42241-notice-gas-safety-related-advice.html. Hot water fluctuates between hot and cold or hot water is unstable. If your home runs on a combi-boiler, then low pressure may be the reason for your lack of hot water. In order to function correctly, your boiler needs a particular balance of water and air to ensure the pressure in the system is adequate for when water is demanded from the boiler – essentially when you switch on your heating or hot water. Last Monday for example and last Thursday when it was really wild outside, it kept shutting down as soon as the radiators had nearly heated up, then it flashes and eventually starts up again then does the whole thing again 5 mins later. No fault code. Time heals all wounds. Once you have restored the correct pressure, ensure the handles are fully closed. Whilst this may seem obvious, it is easy to overlook in the heat of the moment. Also make sure there is a water supply - if no water comes from the taps, there may be a temporary supply interruption. Adjusting your timer may resolve the problem. The operating pressure for most systems is around 1.5 bar, however it is recommended that you consult the manual for your boiler to confirm. Hot water goes cold(usually when in the shower!). How to patch a hole in a toilet waste pipe. Simple Fault Finding Procedure The below guide is a quick and easy method to simply troubleshooting your Worcester Bosch Boiler, simply use the fault finding method below: Electrical Checks. A bit irritating when you're in the shower, as you might imagine. The best thing to do when your Worcester Bosch boiler isn’t producing any hot water is to contact a Gas Safe registered engineer. Only attempt to re-pressurise the boiler if your manual indicates that it is safe to do so and you are comfortable performing this task yourself. You may wish to look at the following options if you feel confident to do so. Worcester Greenstar 30CDI Combi - intermittent hot water. Worcester Greenstar 30CDI Combi boiler. The following steps should be followed: If you continue to experience problems with your boiler losing pressure, find out more about possible causes and solutions in our advice concerning the topic boiler loses pressure. The boiler will still be working perfectly; however, the flow of water between the heat exchange will be reduced. When I turn a hot tap on the boiler fires up and hot water is initially produced but within 10 to 20 seconds the water goes cold again. The cottage walls are very thick. Ensure system has appropriate electrical polarity. Discuss Worcester 28CDi Intermittent Fault. Another factor to consider before calling an engineer or plumber is to check your timer. It may be worth the investment in water softening systems to save on many of your household appliances. Can cause a fall in pressure and result in a cylinder checking other appliances as... It is like scale as well restored the correct pressure level will be. 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