55
P1(High pressure protection) error diagnosis and
solution.
Error Code P1
Malfunction decision conditions If the sampling voltage is not 5V, the LED displays the failure.
Supposed causes
S Wiring mistake
S Over load protector faulty
S System block
S Outdoor PCB faulty
Troubleshooting
et
er t
e w
r
ng
etween t
e
g
pressure
w
tc
an
ma
n contro
oar
s connecte
we
or
orrect
Whether the wiring
between the high pressure
switch and main control
board is connected well or
correctly
et
o
sconnect t
e p
u
Measure the resistance o
e
g
pressure protector
t
e protector
s norma
t
e
a
ue
s o
Method:
Disconnect the plug.
Measure the resistance of
the
high pressure protector, if
the protector is normal the
value is o,
Yes
Yes
onnect it well
Connect it well
No
ep
ace
g
pressure protector
Replace high pressure protector
No
et
er t
e
g
ressure protector
s
ro
en
Whether the high
pressure protector
is broken
heck whether the outdoor
am
ent temperature
s
g
er t
an
Check whether the outdoor
ambient temperature is
higher than 122 °F
No
Stop the unit
Stop the unit Yes
heck i
the outdoor unit
d
Check if the outdoor unit
Yes
e t
e out
oor un
t vent
ate we
Make the outdoor unit ventilate well
heck whether the heat
exc
anger
s
rt
Check whether the heat
exchanger is dirty
No
lean the heat exchanger
Clean the heat exchanger
Yes
heck whether the re
rigerant
ystem
s o
Check whether the refrigerant
system is ok
ep
ace out
oor ma
n
oar
Replace outdoor main
board
No
Hig
ressure protec on
heck i
the outdoor
an runs
proper
Check if the outdoor fan runs
properly
please re
an
peed has been out o
control
mal
ind out t
e cause and
ave it so
ved
speed has been out of control
have it solved.
No
Yes
NO
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