A customer called me worried because the blue light was flashing on his Worcester Greenstar 24Ri and he was worried that it had developed a fault. Older boilers are more prone to faults, and over the years I’ve received quite a few calls about old, faulty Worcester boilers. When the boiler can’t ‘see‘ the thermostat, you get a flashing Central Heating Light the Worcester Bosch boiler. 2. Worcester Bosch Greenstar Junior 28i – blue light flashing, no heating or hot water. Without a pilot light, the boiler won’t be able to provide central heating or domestic hot water. The water and gas are both on at the transmitter unit. Have tried a hard reset using the function on the boiler, and reset the boiler but no further. This is perfectly normal - it is a safety feature of the boiler. Explanation 1: Gas Supply. Their manual does not mention anywhere what this means. Added to this, the Central Heating Mode defaults to OFF at the same time, which you can’t change by pressing any button. It's a worcester greenstar 28i Jr. Worcester greenstar 28i junior flashing green light. Worcester greenstar 28i junior flashing green light ipbr21054 , 18 Oct 2009 , in forum: Plumbing and Central Heating Replies: The boiler will run at a low burn for about 15 minutes to fill the condense trap. The blue light on an RI will flash when it detects no gas supply, or low pressure. 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. You can hear fan starting but boiler does not ignite. However, if the boiler is working properly then, it is not necessary to change the LED. Hi, this is a brief explanation on how I managed to fix my boiler myself, without the need for call out help. No pilot light on boiler. 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. The flashing is going fast and not slow. I did find the manual on it, tried turning it off at the switch and holding the reset but neither worked Joined: Sun Oct 18, 2009 11:02 am Has thanked: 0 Been thanked: 0. When I arrived, he switched the controls on and the boiler's blue light began to flash straight away. A blue light flashing on a Worcester RI boiler indicates there’s a problem with gas supply, flue blockages or the condensate unit. The green light on your Worcester Greenstar RI boiler indicates that burner is working. Worcester greenstar 28i junior flashing green light. 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 Worcester Bosch Greenstar Junior 28i repair. Siphon fill mode. The green light is solid and static. Firstly, LED Failure is an obvious explanation & I would suggest replacing it immediately. 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