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EM6910 pressure 'surging' or 'pulsing'
Hi guys.
i have a em6910 that has started behaving a bit oddly lately. its about 2 years old, maybe more and has been a great machine so far. does what i need it to do. i went away on holidays for 4 weeks, and since coming back its just not been the same. clearly it didn't like sitting idle for that length of time. the first time using it after the break, the pump sounded quite metallic, similar to when its first bought and you need to purge a lot of water through it. it did improve in sound quite quickly, but the issue i have, is ever since my 4 week break, the pressure isn't consistant. the guage, which i know is just a guide, builds pressure as per normal, but once the pour starts, it tends to fluctuate a good 5mm or so, and the pump is clearly 'surging'.
i have descaled it with sunbeam tablet as per instructions, chemical back flushed it, cleaned both shower screens etc etc but it hasn't made any difference. i normally backflush with water after every shot as well. i'm pretty good with the maintenance, which is why i think it has something to do with sitting idle for 4 weeks.
the pour still looks ok, the coffee tastes ok and the pucks come out in one piece, although there is a small amount of residue compared with before. previously the basket would be clean enough to hardly need wiping even.
any ideas as to what could be the possible issue?
also the volumetrics seem to be a bit off. the book says it should automatically stop (when descaling etc) after 250ml but mine pours at least 350-400ml before stopping.
i have a em6910 that has started behaving a bit oddly lately. its about 2 years old, maybe more and has been a great machine so far. does what i need it to do. i went away on holidays for 4 weeks, and since coming back its just not been the same. clearly it didn't like sitting idle for that length of time. the first time using it after the break, the pump sounded quite metallic, similar to when its first bought and you need to purge a lot of water through it. it did improve in sound quite quickly, but the issue i have, is ever since my 4 week break, the pressure isn't consistant. the guage, which i know is just a guide, builds pressure as per normal, but once the pour starts, it tends to fluctuate a good 5mm or so, and the pump is clearly 'surging'.
i have descaled it with sunbeam tablet as per instructions, chemical back flushed it, cleaned both shower screens etc etc but it hasn't made any difference. i normally backflush with water after every shot as well. i'm pretty good with the maintenance, which is why i think it has something to do with sitting idle for 4 weeks.
the pour still looks ok, the coffee tastes ok and the pucks come out in one piece, although there is a small amount of residue compared with before. previously the basket would be clean enough to hardly need wiping even.
any ideas as to what could be the possible issue?
also the volumetrics seem to be a bit off. the book says it should automatically stop (when descaling etc) after 250ml but mine pours at least 350-400ml before stopping.
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