Doesnt work when its warm

It is a known issue, you will probably need a service call.

Nuova Simonelli Appia 2 Compact flashing lights and no brew

https://www.home-barista.com > espresso-machines > nuo...
Feb. 11, 2017 · 3 posts · ‎3 authors
Either the flow meter, scale, or low pressure from your mains. All of these could be caused by scale or even an old water filter. Look at the appia manual online and i think it will tell you that the blinking lights mean low flow or not enough pressure... Nuova Simonelli Appia continuous key flashing on ...
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E N G L IS H - Nuova Simonelli

https://simonelliusa.com > AppiaII-Manual-2-3Gr

PDF You certainly evaluated all these factors and then ... You will see how practical, convenient and efficient working with ... ELECTRIC SYSTEM APPIA V 2 GR.. . .70 ... flash. Hold down the on key for 5 seconds. At this point, the Flash-test will begin; ... Make sure the button lights up. ... pump is not enabled with the level function.

Is it constantly filling even the machine not in use, or just when your brewing, the pump keeps on running? If it is constantly filling that means you filling solenoid valve are mechanically open already. if only when brewing, check you water level sensors.

by opening the bypass valve under the tray need the drain. but certainly you have a problem with either pump motor or volumetric pump

Change the fill level probe. That's the problem.

need to replace the o ring gasket

You might have to use pipe cleaners to get those clean or use a small drill bit.

it means that no water is flowing on the flowmeters. need to check flowmeters if clogged

Has the machine been in cold storage? If no then the inlet solenoid could be the culprit. There might be sediment keeping the valve open.

The metering jet filter on top of the heads are blocked or the solenoid coil is damaged.

It sounds like the thermostat on the boiler nest to the element tripped. Fill machine with water until you can see the level about half way, then open the right side of the espresso machine, you might be able to get to thermostat from the top of machine (make sure it is unplugged) then press the red pin on the boiler between the 2 wires, that should reset the thermostat, if it does not then it will need to be replaced. As for the water on the top of the group head, is there any way you can post a pic of the top, because simonelli made a few different head and I want to give you the correct advise.