Part 3
[39] low pressure sensor Ps circuit
if LED 2 is on
if the low pressure
sensor characteristic is
normal
check outdoor PCB
replace low pressure sensor
modify connector and wires
no
yes
no
no
yes
yes
in running (10 minutes
later after startup) if Ps is over
0.9MPa
compressor damage or 4-way
valve bad reversing will cause
the refriegrant flows from
discharging pipe to suction pipe
through bypass pipe. Check and
replace compressor, 4-way valve
[27] oil temp. too high
- 128 -
yes
no
no
yes
no
yes
yes
compressor discharging
temp. too high, high pressure
rather low
lack of refrigerant, recharge
if oil temp. sensor Toil
resistor is normal
replace sensor
replace pipe
replace pipe
if oil equalization pipe of
model over 10HP is clogged
if every indoor pipe is clogged
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