Explanation 1: Gas Supply. Added to this, the Central Heating Mode defaults to OFF at the same time, which you can’t change by pressing any button. This is perfectly normal - it is a safety feature of the boiler. It’s no fun having a faulty boiler, especially if you don’t know how extensive the work is or how much it’ll cost to fix. Worcester greenstar 28i junior flashing green light ipbr21054 , 18 Oct 2009 , in forum: Plumbing and Central Heating Replies: The green light on your Worcester Greenstar RI boiler indicates that burner is working. A blue light flashing on a Worcester RI boiler indicates there’s a problem with gas supply, flue blockages or the condensate unit. Hi, this is a brief explanation on how I managed to fix my boiler myself, without the need for call out help. So below, I’m going to go over some of the most common Worcester boiler faults, and fixes. Joined: Sun Oct 18, 2009 11:02 am Has thanked: 0 Been thanked: 0. The blue light on an RI will flash when it detects no gas supply, or low pressure. 2. Firstly, LED Failure is an obvious explanation & I would suggest replacing it immediately. I have a Worcester Greenstar boiler ri which has a fast blue flashing light after around 15-20 seconds of it being switched on. It's a worcester greenstar 28i Jr. This could be a range of things such … Worcester Bosch Greenstar Junior 28i Flashing Green Light - Can't Control Heat 14 April 2015 at 7:29PM edited 30 November -1 at 12:00AM in Energy 3 replies 4.3K views You can hear fan starting but boiler does not ignite. The pilot light is a small blue flame that lights a larger flame when there a call for central heating and how water – if it’s burning orange or yellow there could be a carbon monoxide leak. Siphon fill mode. No pilot light on boiler. The boiler will run at a low burn for about 15 minutes to fill the condense trap. Worcester greenstar 28i junior flashing green light. This happens after the boiler has been turned off, if it hasn't been used for a day or so, and if the control knob has been turned down and back up. Older boilers are more prone to faults, and over the years I’ve received quite a few calls about old, faulty Worcester boilers. When I arrived, he switched the controls on and the boiler's blue light began to flash straight away. Without a pilot light, the boiler won’t be able to provide central heating or domestic hot water. Worcester greenstar 28i junior flashing green light. The green light is solid and static. Worcester Bosch Greenstar Junior 28i – blue light flashing, no heating or hot water. The flashing is going fast and not slow. Boiler not working in both hot water and central heating modes. When the boiler can’t ‘see‘ the thermostat, you get a flashing Central Heating Light the Worcester Bosch boiler. Generally, there are two explanations behind it. 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