Acson international A5MAC 210D, Technical Manual

Page: 46 / 49

48
S/N Failure Code Symptom Possible Cause Solution
26
The LED indicator
of the unit displays
ER42 and the
wired controller
displays 42
System 1 middle
heat exchanger
sensor failed
1. TH3 temperature sensor is loosen or
broken off.
Check the control module and replug the
temperature sensor.
2. TH3 temperature sensor is shorted/
open.
Check whether the resistance of TH3
sensor meets specification requirements/
replace if not.
3. Detection circuit for the temperature
sensor in the control module has
malfunctioned.
Replace the control module.
27
The LED indicator
of the unit displays
ER43 and the
wired controller
displays 43
System 2 middle
heat exchanger
sensor failed
1. TH4 temperature sensor is loosen or
broken off.
Check the control module and replug the
temperature sensor.
2. TH4 temperature sensor is shorted/
open.
Check whether the resistance of TH4
sensor meets specification requirements/
replace if not.
3. Detection circuit for the temperature
sensor in the control module has
malfunctioned.
Replace the control module.
28
The LED indicator
of the unit displays
ER44 and the
wired controller
displays 44
Main pipe leaving
water temperature
sensor malfunction
1. TH5 temperature sensor is loosen
or broken off.
Check the control module and replug the
temperature sensor.
2. TH5 temperature sensor is shorted/
open.
Check whether the resistance of TH5
sensor meets specification requirements/
replace if not.
3. Detection circuit for the temperature
sensor in the control module has
malfunctioned.
Replace the control module.
29
The LED indicator
of the unit displays
ER45 and the
wired controller
displays 45
Entering water
temperature sensor
failed
1. TH6 temperature sensor is loosen
or broken off.
Check the control module and replug the
temperature sensor.
2. TH6 temperature sensor is shorted/
open.
Check whether the resistance of TH6
sensor meets specification requirements/
replace if not.
3. Detection circuit for the temperature
sensor in the control module has
malfunctioned.
Replace the control module.
30
The LED indicator
of the unit displays
ER46 and the
wired controller
displays 46
Leaving water
temperature failed
1. TH7 temperature sensor is loosen or
broken off.
Check the control module and ensure the
temperature sensor is securely connected.
2. TH7 temperature sensor is shorted/
open.
Check whether the resistance of TH7
sensor meets specification requirements/
replace if not.
3. Detection circuit for the temperature
sensor in the control module has
malfunctioned.
Replace the control module.
31
The LED indicator
of the unit displays
ER47 and the
wired controller
displays 47
Ambient temperature
sensor failed
1. TH8 temperature sensor is loosen or
broken off.
Check the control module and replug the
temperature sensor.
2. TH8 temperature sensor is shorted/
open.
Check whether the resistance of TH8
sensor meets specification requirements/
replace if not.
3. Detection circuit for the temperature
sensor in the control module has
malfunctioned.
Replace the control module.