Airlock in Pipes? Too much pressure in the boiler will cause the boiler’s automatic safety precautions to kick in and shut the boiler down. If your Worcester boiler is leaking, this can cause low pressure and the boiler to lockout. WB came out today and found a perished flue balancing hose. every time i turn the hot water tap on the boiler fires up and then goes out somtimes it stays lit for anythink up to a minute before it goes out it keeps tryin … read more. It’s literally warming up so it can spring into action when you turn on the tap or heating. I have a two year worcester boiler (just out of warranty:rolleyes:) when I turn it on the blue light is on but the green light only comes on for about 10 seconds before going out. Worcester Bosch Greenstar 24i No Hot Water? Related Questions. It is called short cycling and is likely to make your heating bills more expensive and, in the long term, will cause damage to the boiler. If the boiler fires up every few minutes it is using gas but not heating your home. Alternatively, there could be a deposit build-up or a draught blowing the light out. Up to 3 engineers will be in touch to provide their quote, allowing you to compare them and be confident that you’re getting the most competitive price for work. Slight change in the firing noise about 15 seconds before the light comes on. The boiler fires up for a minute, then cuts out, fires up, cuts out etc, although it doesn't lock out. Whether your boiler runs on gas, oil or electricity, there’s a chance that it might not be receiving enough fuel. When a boiler short cycles, this internal thermostat detects that the water in the heat exchanger is cooling and, although the temperature in your home has not dropped, fires up the boiler to reheat the water. That heat exchanger then is used to heat water. Some combis have a safety cutoff that dont allow the boiler to fire if the pressure is too low. That heat exchanger then … 0. A safety feature designed to prevent boilers from overheating will force the appliance to shut itself down in these instances, as the pump’s job is to move a steady supply of hot water throughout your home – if it is failing to do this, the hot water will stay put in the boiler. These range from serious faults that need the expertise of a heating engineer to more minor issues that are safe to tackle yourself. To help you find out what’s causing your combi boiler to cut out, modern units have a digital display that displays an error code when there’s a fault. The pressure gauge will read below 1 bar. Faulty Pump. Heating works fine. Glow worm combi boiler fires up for 10 seconds then shuts off . They then gave up and called Ideal out for a joint visit. The boiler (don't know output) fires up normally and after ~ 20 minutes reaches its setpoint of 65C, over the next few minutes it will creep up to 70C and then cut out, again fairly normal if min boiler … A blocked condensate pipe will prevent the waste liquid from being disposed of and the boiler will cut out as a result. Try Boiler Guide today! Worcester Bosch Boiler Keeps Shutting Down. Once the powerflush has been carried out, a magnetic filter could be installed to prevent another blockage again in the future – your heating engineer will probably recommend having one fitted too. E&OE. This is most common in older systems and a heating engineer will be able to perform a hot flush of the pump to clear out the blockage. The thermostat or timer is faulty. Find out what’s involved when it comes to Replacing Central Heating Pipes for a Combi Boiler. 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