–110–
Checking code Meaning, detecting method Cause Checking method
1500
1.
When discharge superheart
10 deg is kept for 10 minutes or
discharge superheat 20 deg
for 15 minutes, outdoor unit
stops once, and after 3 minutes,
the unit restarts.
60 minutes after unit stopped is
an intermittent fault check pe-
riod.
2.
When discharge superheart
10 deg is detected for 10 min-
utes or discharge superheat
20 deg for 15 minutes again
(second time), the unit stops and
error code 1500 is
displayed.
3.
In case of SW2-6 ON, the de-
tection for the second time is fol-
lowed by the first time.
1) Excessive refrigerant charge.
2) Thermistor trouble (TH1).
3) Pressure sensor trouble (63HS).
4) Control circuit board trouble.
Check refrigerant amount.
Check resistance of thermistor.
See trouble shooting of pressure sensor.
Check temperature and pressure sen-
sor with LED monitor.
When drain sensor detects flood-
ing during drain pump OFF.
When indirect heater of drain sen-
sor is turned on, rise in tempera-
ture is 20 deg. or less (in water) for
40 seconds, compared with the
temperature detected before turn-
ing on the indirect heater.
Short/open is detected during drain
pump operations. (Not detected
when drain pump is not operating.)
Short : 90˚C or more detected
Open : -40˚C or less detected
When float switch operates (point
of contact : OFF), error stop is ob-
served with code No. “2503” dis-
played.
1) Water leak due to humidifier or the
like in trouble.
1) Drain sensor sinks in water be-
cause drain water level rises due
to drain water lifting-up mechanism
trouble.
2) Broken wire of indirect heater of
drain sensor.
3) Detecting circuit (circuit board)
trouble.
1) Thermistor trouble.
2) Poor contact of connector.
(insufficient insertion)
3) Full-broken of half-broken ther-
mistor wire.
4) Indoor unit circuit board (detecting
circuit) trouble.
1) Drain up input trouble.
2) Poor contact of float switch circuit.
3) Float switch trouble.
Check water leak in the humidifier
and clogging of drain pan.
Check operations of drain pump.
Measure resistance of indirect heater
of drain sensor.
(Normal: Approx. 82Ω between 1-3 of
CN50)
Indoor board trouble if no other
problems are detected.
Check resistance of thermistor.
0˚C : 15kΩ 10˚C : 9.7kΩ
20˚C : 6.4kΩ 30˚C : 4.3kΩ
Check contact of connector.
Indoor port trouble if no other
problem are detected.
Check drain pump operations.
Check connection contact.
Check float switch operations.
Water leak
abnormality
Drain pump
abnormality
Drain sensor
abnormality
Operation of
float switch
2500
2502
2503
Overcharged
refrigerant
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