Daikin UAL-A Series, Engineering Data

Page: 50 / 52

49
34
TH11 temperature
sensor failure
TH11 temperature sensor is not
properly plugged or has broken
off
Check the control module and replug
the temperature sensor
Check the control module and
properly insert the temperature.
TH11 temperature sensor is shorted/
open
Test whether the resistance of
TH11 sensor meets specification
requirements/replace if not
There is something wrong with the
test circuit of the temperature sensor
in the control module
Replace the control module
35
TH12 temperature
sensor failure
TH12 temperature sensor is not
properly plugged or has broken
off
Check the control module and replug
the temperature sensor
Check the control module and
properly insert the temperature.
TH12 temperature sensor is shorted/
open
Test whether the resistance of
TH12 sensor meets specification
requirements/replace if not
There is something wrong with the
test circuit of the temperature sensor
in the control module
Replace the control module
36
The LED indicator
of the unit displays
ER52
Low pressure sensor failure of
#2
Three lines of the low pressure sensor
is incorrectly connected
Reconnect the connecting lines of
the low pressure sensor
The low pressure sensor is shorted/
open
Repair or replace the lines of the
low pressure sensor
The Low pressure sensor has broken
down
Replace the low pressure sensor
There is something wrong with the
test circuit of the low pressure sensor
in the control module
Replace the control module
37
The LED indicator
of the unit displays
ER53
Low pressure sensor failure of
#1
Three lines of the low pressure sensor
is incorrectly connected
Reconnect the connecting lines of
the low pressure sensor
The low pressure sensor is shorted/
open
Repair or replace the lines of the
low pressure sensor
The Low pressure sensor has broken
down
Replace the low pressure sensor
There is something wrong with the
test circuit of the low pressure sensor
in the control module
Replace the control module
38
The digital pipe of the
unit displays ER54
Memory failure Memory damage
Replace the control module
39
The digital pipe of the
unit displays ER60
No system can be started
SYS1 and SYS2 cannot be
automatically recovered
Check the failures of SYS1 SYS2
and recover
40
The digital pipe of the
unit displays ER63
Fan overload failure of System
1
The running current of the fan is too
large. Action of overload protector
1. According to the circuit
diagram, check whether the
setting value of current of
the corresponding overload
protector is correct;
2. Check whether the resistance
of the corresponding fan is
abnormal.
41
The digital pipe of the
unit displays ER64
Fan overload failure of System
2
The running current of the fan is too
large. Action of overload protector
1. According to the circuit
diagram, check whether the
setting value of current of
the corresponding overload
protector is correct;
2. Check whether the resistance
of the corresponding fan is
abnormal.
42
The digital pipe of the
unit displays ER65
The water inlet and water outlet
temperature difference is too
large
The water flow is too small
Check whether the water flow of
water system is normal
TH6 and TH7 falls off
Check whether TH6 and TH7 are
inserted reversely/fall off
Detection circuit problem of control
module temperature sensor
Replace the control module