Daikin RY24PEV1K Service Manual page 107

SiK401004_A
 Malfunction display: F3 Malfunction of Outdoor Ambient Thermistor
 Malfunction display: F4 Malfunction of Exhaust Temp. Thermistor
99
Malfunction of outdoor
ambient thermistor
Yes
Check if the
plug of the temperature sensor is
correctly connected with socket on
the mainboard
Yes
Remove the
sensor to check if the resistance
value is ok
Yes
Replace mainboard of the
indoor unit
Malfunction of exhaust
Temp. thermistor
Yes
Check if the
plug of the temperature sensor is
correctly connected with socket
on the mainboard
Yes
Remove the
sensor to check if the resistance
value is ok
Yes
Replace mainboard of the
indoor unit
No
Check the direction of
the plug and socket
No
Replace temperature
sensor
No
Check the direction of
the plug and socket
No
Replace temperature
sensor
MAINTENANCE