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Banging noise is never a good thing on a heater!
Very low water flow thru heater
Calcification of internals / heat exchanger
Liming of internals in heat exchanger
Steam used to move giant monsters of a train across country, you have steam being generated in your heater, that's causing the bang and probably some rockin' & rollin' of the heater itself?
You should probably have a service tech look at it.
bypass valve is open all the way, and reducing water flow into heater
Worn/broken internal bypass - unitherm governor
Blockage of some sort reducing water flow, in circulation line
When something like the above is present, the minimal water flow, gets super heated really fast when heater is on and firing! So hot in fact, that the water turns to Steam Instantly!
and the steam is a very Volatile substance! Remember? It was once used to move Locomotives!
get this fixed asap!
call a pool / spa professional for assistance in evaluating your next step.
Copy following link to help identify water heater. http://waterheatertimer.org/How-to-fix-water-heater.html Add a comment and describe water heater in detail. Attach video with clear description. If unit has blinking lights, then check product manual for error codes from blinking lights. If unit is delivering no hot water, check for cross connections http://waterheatertimer.org/Crossover.html Call service technician and catch up on routine maintenance, such as cleaning water filter, etc
Faulty heater element. If you have had it for awhile that could be the problem. If it has electronic controls it is possible that the heater button is not functioning but my guess is the heater element especially if it is not getting hot.
Place 1/3 part distilled white vinegar and 2/3 part water into the water reservoir. Turn the machine on and wait for the heat light to go off. Once the heat light goes off, turn the steam vs. water knob to the water drop icon, and turn the main function knob to steam/water. Make sure to have your frothing cup underneath the steam element ready to catch the water. The vinegar/water solution should clear out the calcium that clogs the steam element. Also, remove the cover to the steam element and dip it in a bowl with vinegar for about 5 minutes, and use something like a pipe cleaner to clean out that cover. Then apply vinegar and hot water to a rag and clean the calcium off the shaft of the steam element. Once you are all finished with this, run plain water through the espresso maker on the steam/water setting to clear out the bitter vinegar residue. Now, try again to make espresso and froth it.
Since milk contains calcium, the steam element has to be decalcified more often than a regular coffee maker. The EM-100 is a beautiful machine, but it is definitely high-maintenance - you will probably spend more time cleaning it than making cappuccino, etc.