It's a worcester greenstar 28i Jr. Siphon fill mode. The water and gas are both on at the transmitter unit. Explanation 1: Gas Supply. 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 However, if the boiler is working properly then, it is not necessary to change the LED. 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. 2. This could be a range of things such … Worcester Bosch Greenstar Junior 28i – blue light flashing, no heating or hot water. Firstly, LED Failure is an obvious explanation & I would suggest replacing it immediately. The green light on your Worcester Greenstar RI boiler indicates that burner is working. When the boiler can’t ‘see‘ the thermostat, you get a flashing Central Heating Light the Worcester Bosch 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. No pilot light on boiler. Have tried a hard reset using the function on the boiler, and reset the boiler but no further. The green light is solid and static. Worcester Bosch Greenstar Junior 28i repair. The boiler will run at a low burn for about 15 minutes to fill the condense trap. Posted on 08 Apr 2018. I have a Worcester Greenstar boiler ri which has a fast blue flashing light after around 15-20 seconds of it being switched on. When I arrived, he switched the controls on and the boiler's blue light began to flash straight away. Older boilers are more prone to faults, and over the years I’ve received quite a few calls about old, faulty Worcester boilers. 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. Boiler not working in both hot water and central heating modes. Joined: Sun Oct 18, 2009 11:02 am Has thanked: 0 Been thanked: 0. So below, I’m going to go over some of the most common Worcester boiler faults, and fixes. The blue light on an RI will flash when it detects no gas supply, or low pressure. 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 Without a pilot light, the boiler won’t be able to provide central heating or domestic hot water. A blue light flashing on a Worcester RI boiler indicates there’s a problem with gas supply, flue blockages or the condensate unit. 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. 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