Had the same expierence however the temperture was a bit lower (-6) than you had.
Odds are it is not running out the low point drain. Said drain is often a hose which goes through the bottom of the compartment, and it's leaking inside the compartment and running out the hole the hose goes through, Without investigation it would be impossible to tell the difference.
Odds are one of the hoses in the water compartment, behind the panel with the connections on it, has burst or cracked, In my case it was the inlet to diverter valve line. The easiest one on the whole rig to fix I would not count on that kind of luck