ER-1 Means Battery Starting To Fail

I noticed a “ER-1″ while powering my HTX-202. This could be an indication of error in the operation memory. This can be caused by a low lithium backup battery, or can be caused by static discharge.

To clear the error, turn off the unit. Then press FUNCTION and CLEAR (the D key). While holding these keys, turn unit back on. Reset HTX-202 and clear memories.

There is a good possibility that I need a new battery. Probably a good idea to install a new battery.