Air Conditioner Runs But Does Not Cool (Heat) The Room - Daikin FTXZ25NV1B Service Manual

SiMT041311E
2.3

Air conditioner runs but does not cool (heat) the room.

Supposed
Causes
Troubleshooting
Check No.01
Refer to P.181
Service Diagnosis
Refrigerant leakage
(Make sure that there is no refrigerant leakage or breaks due to over-tightened flare part.)
Improper setting for temperature
Incorrect combination of indoor unit and outdoor unit
Clogged air filter
Insufficient power
Refrigerant piping is too long
Defective field piping (squeezed, etc.)
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Make sure there is no refrigerant
leakage.
Is the set
temperature
appropriate?
YES
Is there required
installation space?
YES
Is the indoor unit
compatible with the
outdoor unit?
YES
Is the air filter clogged?
NO
Is the load (i.e. size of
the room) appropriate
for the capacity?
YES
Is the piping length
appropriate?
YES
Check No. 01
Check the thermistors.
OK
Is the power supply
voltage appropriate?
YES
NO
NO
NO
YES
NO
NO
NG
∗Room temperature thermistor
∗Outdoor temperature thermistor
NO
Troubleshooting
The thermostat is off.
Set the appropriate
temperature.
Short circuit is supposed.
Provide required space.
Match the compatible
models.
Clean the air filter.
Replace with an
appropriate model or add
another unit.
Piping length is to be within
the specified range.
Replace the thermistor(s).
Change power supply
installation.
Check detailed operating
conditions (diagnosis by
gas pressure, operation
current).
(R19679)
128