Daikin ERSQ 011AAV1 Service Manual page 218

Troubleshooting by Indication on the Remote Controller
[CHECK 1] Check for causes of rise in high pressure
Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points.
Local
pressure
rise
Rise in high
pressure
Faulty high
pressure
control
[In heating]
If the indoor unit electronic
expansion valve excessively
throttled:
(See *1.)
High suction
air
temperature
of the
condenser
Degradation
in condensing
capacity
Excessive refrigerant charging
Improper model selection
*1: In heating, the indoor unit electronic expansion valve is used for "subcooled degree control".
(For details, refer to "Electronic Expansion Valve Control" on P.72.)
206
High pipe
resistance
Faulty indoor
unit electronic
expansion valve
Faulty
control
High suction air
temperature of
indoor unit
Faulty suction air thermistor of indoor unit
[In heating]
High suction air temperature of outdoor unit
Faulty outdoor temperature thermistor of outdoor unit
Dirty condenser
Mixing of non-condensable gas
Decreased
fan airflow
rate
[In heating]
Stop valve closed ←Check to be sure the stop valve is open.
←Conduct visual checks for pipe conditions.
Bent or crashed pipe
Clogging of foreign
←Is there any temperature difference caused before
particles
Faulty valve coil ←Are the coil resistance and insulation
Faulty valve body
Faulty high pressure sensor
←Are the electrical characteristics normal?
Faulty indoor unit
←In the connector properly connected?
liquid pipe thermistor
←Is the pressure value checked with the Service Checker
Faulty control PCB
Short circuit
High ambient temperature
←Is the heat exchanger clogged? (In cooling)
←Is air or else mixed in the refrigerant system?
Faulty fan
Decreased
motor
fan
output
Faulty control
PC board
(Including
capacity setting)
Dirty filter
High air
passage
resistance
Obstacle
←Refer to P.173.
←Is the indoor unit too small compared to
the large-sized outdoor unit?
and after the filter or branch pipe.
normal?
Are the thermistor resistance characteristics normal?
corresponding to the measurement of the pressure
sensor?
←Is the suction air temperature not more than 27°C?
←Is the indoor temperature not more than 27°C?
←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Is the outdoor temperature not more than 16°CWB?
←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Can the fan motor be rotated with hands?
Are the motor coil resistance and insulation
normal?
←If a spare PC board is mounted, is the
capacity setting properly made?
←Is the air filter clogged?
←Is there any obstacle in the air passage?
Troubleshooting
ESIE09-08
C: SDK04009