Filter
Top Products
39
Display
Abnormal point and detecting method
Causes
Check points
Operation mode: When drain pump turns on as float switch detects to be in the water except during cooling/dry mode
Check the drain function.
Check moving part of float switch.
Check the value of resistance with the
float switch ON/OFF.
Defective drain
Clogged drain pump
Clogged drain pipe
Adverse flow of drain in other units
Defective moving part of float switch
Foreign matter on the moving
part of float switch(ex. sludge etc.)
Defective float switch
Refrigerant shortage
When the conditions of below detecting
mode or are satisfied during the
compressor operation.
<Detecting mode >
When the below conditions are satisfied
completely.
1. Compressor is operating in HEAT mode.
2.
Discharge superheat is 80 [144
°
F] or more.
3. Difference of outer temperature thermistor
(TH7) and outdoor piping temp. thermistor
(TH3) applies to the formula of
(TH7-TH3)<5 [9°F] .
4. High-pressure sensor is below about
2.04MPa [296PSIG] .
<Detecting mode >
When the below conditions are satisfied
completely.
1. Compressor is operating.
2. When cooling, discharge superheat is 80
[144°F] or more.
When heating, discharge superheat is 90
[162°F] or more.
High pressure sensor is below about
2.32MPa [337PSIG] .
Gas leakage, Gas shortage
When heating operation, refrigerant
shortage feeling operation (When
heating, airflow or thermo OFF are
mixed-operation, it causes a refrigerant
shortage operation.)
Ball valve performance failure
(not full opened.)
Error detection of discharge superheat
1) High-pressure sensor defective
2) Discharge temperature thermistor
defective
3) Thermistor input circuit defective and
high-pressure sensor defective
in multi controller board
Error detection of TH7/TH3
1) Thermistor defective
2) Thermistor input circuit defective in
multi controller board
Check the refrigerant amount.
Check the operation condition and
refrigerant amount.
Check the ball valve is fully open.
1) Check the ball valve is fully open.
2) Check the resistance of discharge
temperature thermistor.
3) According to “Outdoor unit functions”,
set the SW2 and check the high-
pressure sensor level.
According to “Outdoor unit functions”,
check the discharge temp. thermistor
level. When the high-pressure sensor
and discharge temp. thermistor are
normal, if the above mentioned detecting
pressure level and temp. are big different
from the actual pressure and temp.
replace the multi controller board.
1) Check the resistance of thermistor.
2) According to “Outdoor unit functions”,
check the outdoor pipe temp. thermistor
level.
3) According to “Outdoor unit functions”,
check the outer temp. thermistor level.
1501
Water leakage
1. Suspensive Abnormality when float switch
detects to be in the water and drain pump
turns on and off except during cooling or dry
mode.
2. Abnormal when detecting that the drain
pump turns on and off again within 1 hour
after the detection of water leakage
suspensive abnormality, and repeats the
detection twice. <2500> is displayed.
3. The unit continues to detect abnormality
while turned off.
4. To release water leakage suspensive
abnormality
· When not detecting that the drain pump
turns off and on within 1 hour after
detecting suspensive abnormality.
· When turning to cooling operation or dry
operation.
· Detected that [liquid pipe temperature –
room temperature] -10deg[-18°F]
2500
(Float
switch
model)
6 min.6 min.
15 sec.
In the water
Water leakage suspensive abnormality
In the water
Water leakage abnormality
In the air In the water In the air
15 sec.
Within 1 hour Within 1 hour
15 sec. 15 sec.
15 sec.
ON
OFF
Drain pump
Float switch
ON
OFF