mrcool.com Page 52
Parts that
could be
causing the issue
Error Code
EC 51
EC 56
EC 07/
(O) EC 71
PC 08/
(O) PC 44/
PC 46/PC 49
PC 00/
PC 04
PC 01/
(O) PC 10
PC 11/ PC 12
(O) PC 0F
Outdoor PCB
Outdoor fan motor x x x x
T3 Sensor x x x x x x x
T4 Sensor x x x x x x x
TP Sensor x x x x x x x
T2B Sensor x x x x x x
Reactor or inductance x x x
Compressor x x x x x x
IPM module board x x x x
Bridge rectifier x x x x
PFC module x x x x x x
Additional refrigerant x x x x x x x
Electric control box x x x x x x x
High pressure switch x x x x x x x
Low pressure switch x x x x x x x
(O) represents the error code being displayed on the outdoor unit.
Disclaimer: The error codes and descriptions are for reference only. If your system displays
any of these codes contact the MRCOOL technical department for more information or a
qualified service technician to investigate the issue further.
IMPORTANT!
If the error code “F6” appears during initial start up on a
newly installed unit, this could be caused by a loose wiring
connector on the circuit board of the outdoor condenser
due to shipping & handling (please refer to the image to
right). Reconnect the connector and ensure it is properly
seated to resolve the issue.
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