There's no point in it running if it can't extract any heat from the
air. It's a wonder it was running and putting out much when it got down
below 20F or so.
--FT
On 2/16/21 10:36 AM, Kaleb Striplin via Mercedes wrote:
Power just came back on a few minutes ago. Outside unit still not
running. I did find the installation manual online though. Here is
some info about the defrost and lockouts. Sounds like it may simply
be locking out because the temp is too low.
Heating Mode:The compressor and fan motor will stop when the low
pressure control opens and will start again when the low side pressure
rises to approximately 40 psig when the low pressure automatically
resets�If the low pressure switch trips 3 times within 120 minutes of
operation during a particular call for heating operation, the defrost
control will lock out compressor and outdoor fan operation�If the lock
out due to low pressure occurs at an outdoor ambient temperature below
5°F, the defrost control will automatically exit the lockout mode when
the outdoor ambient temperature rises 5°F�This feature is necessary
since the low pressure control could possibly have opened due to the
outdoor ambient being very low rather than an actual system fault�
Of course with the power being out I figure that would have caused the
lockout to reset at least for a while. Will see what happens when it
gets over 5 this afternoon.
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