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They do not fail very often because most people know to replace them when the system is opened or compromised... so they are typically the newest hard part of the system at any time...
If left long enough OR subject to too much vibration I think the sacks holding the desiccant are subject to rupture ( some units have wire mesh instead )......
If you are worried either that it will break and mess up things downstream..
OR that it is not functioning as a dryer ( having been ' soaked' ) .. then by all means have it replaced... the cost of the unit is very little compared to the consequences of either of the types of failure I just described... The labor is the higher cost of the procedure....
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