HL2 is an error code for High Limit #2. This error means the water in the heat exchanger is too hot. You need to check flow to the heater as well as the switch.
They are really pretty simple. See if you can go on Rheem's site and get a .pdf of the manual (if you don't have one). These things are really simple, and you'll save a bunch if you can get it yourself.
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