Radiation Fin Temperature Rise - Daikin RMXS-L Series Service Manual

Troubleshooting for Outdoor Unit

7.18 Radiation Fin Temperature Rise

L4
Error Code
Method of Error
Fin temperature is detected by the thermistor of the radiation fin.
Detection
Error Decision
When the radiation fin temperature increases above 83°C (181.4°F)
Conditions
 Defective main PCB (A1P)
Supposed
 Defective radiation fin thermistor (FINTH)
Causes
Troubleshooting
Turn OFF the power supply,
and then make measurement
of resistance of the radiation
fin thermistor.
Disconnect the connector
X111A and then properly
connect it.
Refer to Thermistor Resistance / Temperature Characteristics table 2 on page 225.
203
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
The radiation
YES
fin temperature exceeds
83°C (181.4˚F).
NO
NO
Is the thermistor
resistance normal?
YES
Does
the malfunction
YES
recur when the power
supply turns ON to start
the compressor?
NO
SiUS181305E
Faulty radiation from the power unit
∗ Blocked air suction port
∗ Stained radiation fin
∗ High outdoor temperature
Replace the radiation fin thermistor.
Replace the main PCB (A1P).
Continue operation.
It is supposed that the radiation fin
temperature became high due to
some field factors. In this
connection, check the following
points:
∗ Stained radiation fin
∗ Airflow obstructed with dirt or
foreign matters
∗ Damage to fan impellers
∗ Too high outdoor temperature
(R19094)
Troubleshooting