Lennox Mini-Split Service Manual / Page 230
P3 Fault Code
Basic Description:
Outdoor unit low temperature lockout.
General Note:
The outdoor unit will lockout if when in heating mode, when the outdoor temperature is
lower than -13°F (-25°C) for 1 hour, the indoor unit display error code.
The outdoor unit will resume operation when either:
The OUTDOOR temperature is higher than -7.6°F (-22°C) for 10 minutes and
compressor has been stopped for 1 hour
or
Outdoor temperature is higher than 23°F (-5°C) for 10 minutes
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