Daikin SkyAir GQI-Eco Series Service Manual page 97

Skyair gqi-eco rzqg71~140lv1b series heat pump r-410a 50hz
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SiBE281013
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
· Indoor unit fan runs at set airflow rate.
· (In cooling operation)
When suction air thermistor temperature is higher than set temperature
· (In heating operation)
When suction air thermistor temperature is lower than set temperature
Is the power
switch OFF or the fuse for power
switch blown?
NO
Is the heating
switch turned ON at outdoor
temperature > 32˚C
NO
(1)
Is rated voltage
applied at the compressor
terminals?
NO
(2)
Is rated voltage
output from the magnetic switch
or power transistor?
NO
(3)
Is rated voltage output
from the PCB?
NO
Suction air
thermistor
Indoor unit
PCB
Input
to
PCB
Service Diagnosis
YES
YES
YES
YES
YES
Outdoor unit
PCB
Relay
Output
Input
from
to
PCB
PCB
Magnetic
switch
COMP
(3)
(2)
Output from
Output from
relay or
magnetic
micro-
switch or SW
computer
circuit of
power
transistor
Symptom-based Troubleshooting
Turn ON the power switch or
replace the fuse.
Normal.
(Thermostat OFF by outdoor
temperature)
Replace the compressor.
Replace the magnetic switch or
power transistor.
Replace the PCB.
Check the thermistor.
(1)
Output from
magnetic
switch or
U,V,W of
power
transistor
87

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