If the unit has locked itself, all three lights at the top of the panel will flash, signaling there has been a failure that should be investigated and resolved prior to further use. Lights will flash for about 5 min.

1) While the lights are flashing, switch the main power off from the battery (Pull power plug, remove the fuse, open breakers, or in-line switch).

2) Wait for 5 sec. and switch the main power back on.

3) Press Heat Button (3) for more than 3 seconds to shut down the heater.

4) Restart the heater normally.

See instructional video to unlock: