Your boiler will have either a dial to control the flow temperature or some buttons and a digital display. You’ll probably need to open a flap on the boiler to access this – don’t worry, you’re allowed to open the flap. If you have a conventional boiler with a hot water cylinder, then there will be just one dial or setting to adjust.
Check if water pressure has dropped on the boiler it should be around 1>1.5 bar in the green. If this is the case turn the boiler switch back to o wait few seconds and turn the switch back to on position and hold for few seconds and the boiler should restart. If the pressure has dropped in your boiler, there will be a leak on your heating system. mam I have a Weil-Mclain CG Boiler and the pilot light is Lit but not all Boiler tubes are burning.i got hot water threw the sink but no Radiant floor heat in the house.I dont know why the other boile … read more

I had the same problem with my ariston bioler after bleeding the radiators (removing the air from them). From what i can see the "E 02" code means a lack of pressure in the system. To clear this i released more water into the system on the MFFI boiler there should be 2 black taps on the inlet pipes turn the middle one about half turn.

If the pressure is higher than 1.5 bars, then the pressure is too high. It is easy to pressure release water from a boiler and fix this issue. In most cases, all you will need to do is bleed the radiators in your home using a radiator key to release some of the pressure. There is a pressure release valve on every radiator that you can easily find.

Shutdown due to insufi cient water circulation. If the green leds 1 flash and the boiler is of , one possible cause for this state is an insuficient pressure of water in the system - green LED 40-. 50 blink. Check the water pressure on the pressure gauge 4 and make sure that is between 0.6 and 1.5 bar when the system is cold. S3xi6K.
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    • how to turn on ariston boiler