It is possible that your unit has an 'acidic effluent' sensor built into the condensate drain line, that is defective. Try turning power off to the water heater for 5 minutes, then turn it back on, and see if the error code remains or not.
Next please attach a well focused, close up photo of the wiring diagram glued inside the service panel, the picture needs to be taken from straight on, in very good light.
You can use the paper clip- icon at the right end of the tool bar at the top of this dialog box to attach it here.,Include a picture of the thermostat wire connections to the printed circuit board in the same area.
If you have an error code showing, tell me what the code read out is on the wiring diagram or a sticker next to the diagram please.
If there is no paper clip-icon, look for the '+attach files'link at left of your send button.
I can mark it up with trouble shooting instructions.