Goodknight 420E ERROR 15

Hi, I bought this as a spare, and it tipped over one night. I dried it "thoroughly". But then this err came on.
Anyone else have this careless experience? I can't find a manual, or on-line sight to give me a clue as
To whether this error is fixable, and cost effective. Appreciate any help. Anyone having trouble using
Their c-pap, I've had one for 10 yrs now, can't sleep without it! And I'm the "princess with the pea"!.
T

Error codes in double digits aren't listed other than XX in the provider manual that I found and it appears that anything with XX or 2 digit error codes means
"the device has detected an operating fault"....."contact technical support"

I suspect that the water damaged the electronics in some fashion.
I cannot seem to locate a service manual for it to try to find out any more specifics.

I opened up the machine and changed the battery, Needs to be unsoldered from the base board.

Hufflinks wrote:I opened up the machine and changed the battery, Needs to be unsoldered from the base board.

What battery did you used? My battery is completely dead.