Troubleshooting by Remote Controller
SiBE341001
189
Troubleshooting
Check for causes of rise in high pressure
Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points.
CHECK 1
Local
pressure
rise
[In cooling]
If the outdoor unit electronic
expansion valve is throttled:
(See *1.)
Faulty high
pressure
control
Rise in high
pressure
[In heating]
If the indoor unit electronic
expansion valve is excessively
throttled:
(See *2.)
High suction
air
temperature
of the
condenser
[In cooling]
[In heating]
Degradation in
condensing
capacity
Excessive refrigerant charging
Improper model selection [In heating]
High pipe
resistance
Faulty outdoor
unit electronic
expansion valve
A temperature difference in excess of 10°C between the
inlet and the outlet is deemed to be abnormal.
Faulty
control
Faulty indoor
unit electronic
expansion valve
Faulty
control
High suction air
temperature of
indoor unit
High suction air
temperature of
indoor unit
Faulty suction air thermistor of indoor unit
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
Decreased
fan output
High air
passage
resistance
Faulty fan
motor
Faulty control
PCB (Including
capacity
setting)
Dirty filter
Obstacle
Stop valve closed
Bent or crashed pipe
Clogging of foreign
particles
Faulty valve coil
Faulty valve body
Faulty high pressure sensor
Faulty control PCB
Faulty valve coil
Faulty valve body
Faulty high pressure sensor
Faulty indoor unit
liquid pipe thermistor
Faulty control PCB
Short circuit
High ambient temperature
Short circuit
High ambient temperature
←
Check to be sure the stop valve is open.
←
Conduct visual checks for pipe conditions.
←
Is there any temperature difference caused
before and after the filter or branch pipe.
←
Are the coil resistance and insulation normal?
←
Are the electrical characteristics normal?
←
Is the pressure value checked with the Service Checker
corresponding to the measurement of the pressure sensor?
←
Are the coil resistance and insulation
normal?
←
Are the electrical characteristics normal?
←
Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←
Is the pressure value checked with the
Service Checker corresponding to the
measurement of the pressure sensor?
←
Is the suction air temperature not more
than 43°C?
←
Is the outdoor temperature not more than 43°C?
←
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?
←
Is the heat exchanger clogged? (In cooling)
←
Is air or else mixed in the refrigerant system?
←
Can the fan motor be rotated with hands?
Are the motor coil resistance and
insulation normal?
←
If a spare PCB is mounted, is the capacity
setting properly made?
←
Is the air filter clogged?
←
Is there any obstacle in the air passage?
←
Refer to “F6” troubleshooting.
←
Is the indoor unit too small compared to
the large-sized outdoor unit?
*1: In cooling, it is normal if the outdoor unit electronic expansion valve (EVM) is fully open.
*2: In heating, the indoor unit electronic expansion valve is used for “subcooled degree control”.
(For details, refer to “Electronic Expansion Valve Control”.)
Summary of Contents for RQYQ140-180PY1
Page 216: ...Piping Diagrams SiBE341001 207 Appendix 1 2 BS Unit BSVQ100 160 250PV1 4D057985B...
Page 217: ...SiBE341001 Piping Diagrams Appendix 208 BSV4Q100PV1 3D064148...
Page 218: ...Piping Diagrams SiBE341001 209 Appendix BSV6Q100PV1 3D064149...
Page 220: ...Wiring Diagrams for Reference SiBE341001 211 Appendix 2 2 BS Unit BSVQ100 160 250PV1 3D055928C...
Page 221: ...SiBE341001 Wiring Diagrams for Reference Appendix 212 BSV4Q100PV1 3D063928B...
Page 222: ...Wiring Diagrams for Reference SiBE341001 213 Appendix BSV6Q100PV1 3D063929B...
Page 223: ...SiBE341001 Option List Appendix 214 3 Option List 3 1 Option Lists Outdoor Unit 3D066354...