When heating up my LaValentina Levetta has a thermosyphon stall. It only heats to about 190F at the grouphead. When I turn on the pumps it sputters a bit and pushes out air. After that I put a blindfilter in the group and flush. This trick helps to solve the problem and 15-20 minutes later the group temp is back to it's normal 203F. I hate this because my machine is on a timer and I want an espresso when I get home from work. The weird thing is that once in 3 times it doesn't have a thermosyphon stall but when I remove the towel from the grouphead after heating it will slowly drop in temp when not used over a period of 5 minutes and also end at about 190F. When I use the machine one time to pull a shit it won't stall again, even when letting it sit for a couple of hours.
I've descaled the machine a month ago an pulled the mushroom out and all other parts of the group and descaled them. There wasn't much scale in there due to me using a waterfilter. I aslo took the OPV out and descaled it completely. The inner parts of the OPV where renewed about 6 months ago. So it shouldn't be a maintenance-issues. I also checked all the fittings and there doesn't seem to be a leak anywhere.
When shutting the machine down I always empty the watertank and refill it the next morning when putting it on the timer. After cooling down for about 30 minutes there a couple of drops in the reservoir under the exhaust of the 3-way valve. the pressure of the machine is 9 bar tested and adjusted with my manometer portafilter.
I hope to have given you guys enough information to help me out with this problem. I just can't find out where the air is coming from. Could it be me emptying the tank pushing some air in the group when it turns on because of the water filter? That could be the only thing I can come up with.
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