– 55 –
Operation of dia
g
no
s
tic function
Check code
S
tatu
s
of
air conditioner
Condition
Cau
s
e of operation
Jud
g
ment and mea
s
ure
s
Indoor unit
P26
S
hort-circuit trouble of compressor
driving element
S
top
Displ
a
yed when
trouble is detected
1. When performing oper
a
tion while t
a
king-off compressor
wire, P26 trouble occurs. Check control P.C. bo
a
rd
(MCC-15
99
).
2. When performing oper
a
tion while t
a
king-off compressor
wire,
a
n trouble does not occur.
(Compressor l
a
yer short-circuit )
H04
C
a
se thermost
a
t oper
a
tion
∗
Abnorm
a
l overhe
a
t of compressor
S
top
Displ
a
yed when
trouble is detected
1. Check c
a
se thermost
a
t
a
nd connector.
2. Check g
a
s le
a
k, rech
a
rge
3
. Check full open of service v
a
lve.
4. Check PMV (Pulse Motor V
a
lve).
5. Check broken pipe.
P04
High pressure
S
W system trouble
S
top
Displ
a
yed when
trouble is detected
1. Check service v
a
lves
a
re fully opened.
(G
a
s side, Liquid side)
2. Check of outdoor f
a
n oper
a
tion.
3
. Check motor trouble of outdoor f
a
n.
4. Check clogging of outdoor PMV.
5. Check clogging of he
a
t exch
a
nger in indoor/outdoor units.
6.
S
hort-circuit st
a
tus of suction/disch
a
rge
a
ir in outdoor unit.
7. Check outdoor P.C. bo
a
rd trouble.
8
. Check f
a
n system trouble (C
a
use of
a
ir volume drop)
a
t indoor side.
9
. Check PMV opening st
a
tus in indoor unit.
High pressure
S
W system trouble
S
top
Displ
a
yed when
trouble is detected
1. Check service v
a
lves
a
re fully opened.
(G
a
s side, Liquid side)
2. Check of outdoor f
a
n oper
a
tion.
3
. Check motor trouble of outdoor f
a
n.
4. Check clogging of outdoor PMV.
5. Check clogging of he
a
t exch
a
nger in indoor/outdoor units.
6.
S
hort-circuit st
a
tus of suction/disch
a
rge
a
ir in outdoor unit.
7. Check outdoor P.C. bo
a
rd trouble.
8
. Check f
a
n system trouble (C
a
use of
a
ir volume drop)
a
t indoor side.
9
. Check PMV opening st
a
tus in indoor unit.
P0
3
Disch
a
rge temp. trouble
∗
Disch
a
rge temp. (TD) over
specified v
a
lue w
a
s detected.
S
top
Displ
a
yed when
trouble is detected
1. Check refriger
a
ting cycle (G
a
s le
a
k)
2. Trouble of electronic exp
a
nsion v
a
lve
3
. Check disch
a
rge temp. sensor (TD).
P05
Power supply volt
a
ge trouble
S
top
Displ
a
yed when
trouble is detected
1. Check power supply volt
a
ge. AC
3
42 to 457V
P2
9
Position detection circuit trouble
S
top
Displ
a
yed when
trouble is detected
1. Check control P.C. bo
a
rd (MCC-15
99
).
Open ph
a
se of
3
-ph
a
se power supply
S
top
Displ
a
yed when
trouble is detected
1. Check open ph
a
se of
3
-ph
a
se power supply.
2. Bl
a
ck le
a
d wire to be connected to CN0
3
of MCC-15
9
6
does not p
a
ss through T611.
P20
High pressure protective oper
a
tion
∗
During cooling oper
a
tion, outdoor
temp. sensor (TL) detected
temper
a
ture over specified temp.
∗
During he
a
ting oper
a
tion, indoor
temp. sensor (TC, TCJ) detected
temper
a
ture over specified temp.
S
top
Displ
a
yed when
trouble is detected
1. Check outdoor he
a
t exch
a
nger sensor (TL).
2. Check indoor he
a
t exch
a
nger sensor (TC, TCJ).
3
. Check full open of service v
a
lve.
4. Check indoor/outdoor f
a
n.
5. Check PMV (Pulse Motor V
a
lve).
6. Check clogging
a
nd short-circuit of indoor/outdoor he
a
t
exch
a
nger.
7. Overch
a
rge of refriger
a
nt. Rech
a
rge
P22
Outdoor f
a
n system trouble
S
top
Displ
a
yed when
trouble is detected
1. Check lock of f
a
n motor.
2. Check power supply volt
a
ge between L2
a
nd N.
AC
3
42 to 457V
3
. Check outdoor P.C. bo
a
rd.
