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You simply do not have enough water pressure inside your heating system and therefore the Boiler will not fire up. On your Control Panel, press the Bar/Mode button to display the system pressure... Then under the Boiler you will find a valve (On ours its a Blue knob), turn it anti-clockwise to let in more water, when the indicated pressure reaches that required by your system (On ours its 1.7 Bar) shut the value (Turn knob clockwise) - Then you can restart the system.
Hello
The water pressure should be 15 to 12 psi.If your at 2.1 there is a problem with your auto fill valve.
Which means the boiler is shut down on low water.
The auto fill valve is connected to your incoming cold water from the home,shut it off and check the screen inside for dirt or rust,you may need to have another one installed.
The only thing the expansion valve does is open when the pressure gets to 12 bars when the coffee boiler is heating or when you are backwashing the groups. If you need to adjust wait until red light comes on to say coffee boiler is heating then if gauge is going beyond 12 bars turn end of expansion valve to left to keep it at 12 or right to take it to 12 if it is lower, before doing this make sure pump is set to 9 bars.
on the pipework below there may be a silver braided hose with one or two valves on the end. turn the valve(s) so the handle is inline with the pipe this will allow water from the mains supply into the heating circuit , remember to keep an eye on the pressure gauge. fill the system to 1bar cold then shut down the valve(s). turn on the boiler and it should be ok, if you lose pressure again then you may have a leak somewhere which needs to be found.
a couple of things , is your filling loop disconected ? , and are all your radiators blead from air, have you got a high point where the air can get stuck in system say pipes going into roof etc you may need to fit a air release valve in line at highest point to remove the air from system , your boiler should be around 1.5 bar running preasure average setting . if you are constanly filling with water you could be exceeding the pressure valve limet which releases pressure from system this could be faulty ?
the boiler reqs to be pressurised to 1 bar in a cold state, in operation the heat expansion with cause the gauge to rise by about half a bar so in full working mode with heating on you'll expext the gauge to register around 1 1/2 bar-
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