Haier Unitary smart series Service Manual page 179

4) Indoor DC motor abnormal
Alarm condition:outdoor DC motor is blocked rotor or broken, abnormal.
This fault is only used when indoor unit is with DC fan motor.
LCD of wall mounted unit display F2
Check if the indoor unit fan blade
is blocked by some objects
no
Check if the lead wire of DC motor
is broken or short-connected
no
Replace motor
Warning: For outdoor DC fan motor, forbidden to pull off the plug when
being electrified.
5) Temperature cutoff protection
Alarm condition: indoor coil temperature sensor value is abnormal;
or outdoor 4-way valve coil is invalid
LCD on wall mounted
unit displays E18
Check if indoor coil
temp. sensor value is
normal
yes
Check if resistor R34
on PCB is 20K
yes
When only powering to outdoor
4-way valve coil, check if the coil
can reverse normally
yes
adjust fan blade to
make it run normally
yes
adjust lead wire
of fan motor
no
Replace coil
temp. sensor
no
replace resistor
no
replace 4-way valve
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