![background image](http://html.mh-extra.com/html/daikin/ftxz25nv1b/ftxz25nv1b_service-manual_2459562143.webp)
SiMT041311E
Troubleshooting
Service Diagnosis
128
2.3
Air conditioner runs but does not cool (heat) the room.
Supposed
Causes
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.)
Troubleshooting
Check No.01
Refer to P.181
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).
Is the set
temperature
appropriate?
Is the power supply
voltage appropriate?
(R19679)
YES
NO
Caution
Is there required
installation space?
Is the indoor unit
compatible with the
outdoor unit?
NO
NO
NG
NO
NO
YES
YES
YES
YES
YES
YES
NO
Is the air filter clogged?
OK
Is the load (i.e. size of
the room) appropriate
for the capacity?
Is the piping length
appropriate?
NO
Check No. 01
Check the thermistors.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
∗
Room temperature thermistor
∗
Outdoor temperature thermistor
Make sure there is no refrigerant
leakage.