AE-X108 - Sharp Air Conditioner Service Manual (repair manual). Page 31

31

Function

NO

Description

Detection 
time

Restart 
condition

Restart 
times

Indoor Outdoor

Operation

Self diagnostic
display

  

AC 
overcurrent

Compressor
lock

Compressor 
overheating 
control

5

6

7

Lowers the operating frequency if the 
temperature of the compressor chamber 
thermistor (TH1) rises above 105

°

C.

Stops the compressor if the thermistor 
stays above 104

°

C for 4 minutes, or 1 

minute at minimum frequency or less.

Lowers the operating frequency if the 
compressor AC current exceeds 
Peak control level 
[10.1/8.0A (heating), 7.5/6.15A (cooling)] 
[AY-X138E/AY-X108E] 
Stops the compressor if the current 
exceeds peak control level at 40 Hz or less.
Stops the compressor if the compressor 
AC current exceeds 15A.

During 
compressor 
operation

Immediately 
after 
compressor 
activation.

During 
compressor 
operation

During 
compressor 
operation

Automatically restarts after 
safety time (170 seconds)

Automatically restarts after 
safety time (170 seconds) 

Automatically restarts after 
safety time (170 seconds)

No limit

No

No

No limit

Yes

No limit

 

Yes

No limit

No

No

Compressor
high
temperature 
error

8

Stops the compressor if the compressor 
chamber thermistor is above 114

°

C.

(Or when TH1 shorts)

During 
operation

Outdoor 
overheating 
control

9

Automatically restarts after 
safety time ( (170 seconds)

When 
compressor 
is activated

Outdoor 
thermistor 
short

10

Stops the compressor if an outdoor 
thermistor (excluding TH1) shorts.
(Except for the AU-X138E, AU-X108E)

Automatically restarts after 
safety time ( (170 seconds)

4 times

Yes

Yes

4 times

Yes

Yes

4 times

Yes

Yes

4 times

Yes

Yes

When 
compressor 
is activated

Outdoor 
thermistor 
short

11

Stops the compressor if the circuit of an 
outdoor thermistor breaks.
(Except for the AU-X138E, AU-X108E)

Automatically restarts after 
safety time ( (170 seconds)

4 times

Yes

Yes

4 times

Yes

Yes

During 
compressor 
operation

AC 
abnormal 
current error

12

Stops the compressor if if the operating 
frequency is above 70 Hz and the 
compressor current is below 1.1 A/0.85 A.
[AE-X138E/AE-X108E]

Automatically restarts after 
safety time ( (170 seconds)

4 times

Yes

Yes

During 
operation

Serial 
signal error

Four-way 
valve error

13

14

Restarts after reception of 
serial signal.

Automatically restarts after 
safety time (170sec.) 

During 
operation

4 minutes after
compressor 
activation

Stops the compressor if the outdoor unit 
does not receive a serial signal from the 
indoor unit for 30 seconds.

When the rise and fall in the detected 
temperature of the outdoor heat 
exchanger thermistor (TH2) do not agree 
with the operating cycle.

Turns the compressor relay off if the 
indoor unit does not receive a serial 
signal from the outdoor unit for 8 minutes.

Stops the compressor if the compressor 
AC current exceeds 3.37/2.83A
[AY-X138E/AY-X108E] 
immediately after activating the compressor 
(at 17 to 30 Hz).

Lowers the operating frequency if the 
temperature of the outdoor heat exchanger 
rises above 57

°

C during cooling. Stops the 

compressor if the temperature stays above 
57

°

C for 4 minutes, or 1 minute at 

minimum frequency or less.

Automatically restarts less 
than 8 minutes after operation 
stops.

Automatically restarts 
when thermistor (TH1) 
temperature falls below 
100

°

C (approximately 30 

minutes)