E2 low discharge
temperature protection
Does the electronic expansion valve
work properly when the indoor unit is
started or halted?
Check the electronic
expansion valve.
Is the signal cable well
connected to the main board
Re-connect the
signal cable.
Does the outdoor unit's electronic
expansion valve work properly when the
module is enabled and disabled in the
heating mode?
Is the electronic expansion valve
of the subcooler normal?
Too many
refrigerants are
charged
Check if the system enters the protection mode after
1.5 hours of continuous operation upon release of
1kg of refrigerants. Repeat the operation until the
protection mode is no longer enabled.
No
No
No
No
Yes
Yes
Yes
Replace the
main board
Yes
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