70
Failure mode detected by outdoor unit
Operation of diagnostic function
Judgment and measures
Check
code
Cause of operation
Status of air
conditioner
Condition
F04
Disconnection, short-circuit of
discharge temp. sensor (TD)
Stop
Displayed
when trouble is
detected
1.Check discharge temp. sensor (TD).
2.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
F06
Disconnection, short-circuit of
outdoor temp. sensor (TE)
Stop
Displayed
when trouble is
detected
1.Check temp. sensor (TE).
2.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
F07
Disconnection, short-circuit of
outdoor temp.sensor (TL)
Stop
Displayed
when trouble is
detected
1.Check temp. sensor (TL).
2.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
F12
Disconnection, short-circuit of suction
temp.sensor (TS)
Stop
Displayed
when trouble is
detected
1.Check suction temp. sensor (TS).
2.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
F15
Miss-mounting of outdoor temp.
sensor (TE, TS)
Stop
Displayed
when trouble is
detected
1.Check temp. sensor (TE, TS).
2.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
F08
Disconnection, short-circuit of outside
temp. sensor (TO)
Continue
Displayed
when trouble is
detected
1.Check outside temp. sensor (TO).
2.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
F13
Disconnection, short-circuit of heat
sink temp. sensor (TH)
Stop
Displayed
when trouble is
detected
1.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
(Q201 is incorporated in TH sensor.)
F31
Outdoor P.C. EEPROM trouble
Stop
Displayed
when trouble is
detected
1.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
L10
Unset jumper of service P.C. board
Stop
Displayed
when trouble is
detected
1.Outdoor service P.C. board.
Check model type setting jumper wire.
L29
Communication trouble between
outdoor P.C. board MCU
Stop
Displayed
when trouble is
detected
1.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
P07
Heat sink overheat trouble
* Heat sink temp. sensor detected
over specified temperature.
Stop
Displayed
when trouble is
detected
1.Check screw tightening between P.C. board and heat
sink and check radiator grease
(GP56: MCC-1768, GP80: MCC-1705).
2.Check heat sink blast path.
P15
Detection of gas leak
* Discharge temp. sensor (TD),
Suction temp. sensor (TS) detected
temperature over specified temp.
Stop
Displayed
when trouble is
detected
1.Check gas leak, recharge.
2.Check full open of service valve.
3.Check PMV (Pulse Motor Valve).
4.Check broken pipe.
5.Check discharge temp. sensor (TD), suction temp.
sensor (TS).
P19
4-way valve inverse trouble
* After heating operation has started,
indoor heat exchanger temp. lowers
under the specified temp.
* After heating operation has started,
outdoor heat exchanger / suction
temp. rises over the specified temp.
Stop
Displayed
when trouble is
detected
1.Check operation of 4-way valve.
2.Check outdoor heat exchanger (TE), suction temp.
sensor (TS).
3.Check indoor heat exchanger sensor (TC).
4.Check 4-way valve coil.
5.Check PMV (Pulse Motor Valve).
H01
Compressor break down
* Although operation has started,
operation frequency decreases and
operation stops.
Stop
Displayed
when trouble is
detected
1.Check power supply voltage. (AC198 to 264 V)
2.Overload operation of refrigerating cycle.
H02
Compressor lock
* Over-current detection after
compressor start-up
Stop
Displayed
when trouble is
detected
1.Trouble of compressor (Lock, etc.): Replace compressor.
2.Wiring trouble of compressor (Open phase).
H03
Current detection circuit trouble
Stop
Displayed
when trouble is
detected
1.Check outdoor P.C. board
(GP56: MCC-1768, GP80: MCC-1705).
(AC current detection circuit)
F23
Ps sensor trouble
Stop
Displayed
when trouble is
detected
1.Check connection of Ps sensor connector.
2.Check failure of Ps sensor.
3.Check compressing power trouble of compressor.
4.Check 4-way valve trouble.
5.Check outdoor P.C. board trouble.
P03
Discharge temp. trouble
* Discharge temp. (TD) over
specified value was detected.
Stop
Displayed
when trouble is
detected
1.Check refrigerating cycle (Gas leak).
2.Trouble of electronic expansion valve.
3.Check discharge temp. sensor (TD).