6. Press and hold down the left most two buttons until the red LED light becomes a solid red. Then release the two buttons.
7. Locate the power toggle above the board we were working on. Toggle it off then on to reset the unit.
8. Check the console to set an appropriate temperature. Takagi support recommends 120 F, we set ours to 122 F.
9. Go to a faucet to run the hot water.
10. Look for signs that the tankless is operating. It should the sound like a condenser fan.
11. If the hot water is working, then great the problem is solved or at least deferred till another day. If the hot water is not working then you need to find a tech in your area who can remove and clean the burner unit.