SHARP AH-X108E - AH-X138E SPLIT TYPE ROOM AIR CONDITIONERS Led blinking and circuit diagram
SHARP AH-X108E - AH-X138E
Overcurrent protection
(1) Compressor lock detection If the set value (4.37 A: AE-X138E, AU-X138E / 3.83 A: AE-X108E, AU-X108E) of AC current is exceeded at 10 to 30 Hz when operation begins, operation is stopped. In this case, the compressor and outdoor fan does not stop, and 170 seconds after operation is stopped, another try will be made. Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by removing the plug and cutting the power.
(1) Compressor lock detection If the set value (4.37 A: AE-X138E, AU-X138E / 3.83 A: AE-X108E, AU-X108E) of AC current is exceeded at 10 to 30 Hz when operation begins, operation is stopped. In this case, the compressor and outdoor fan does not stop, and 170 seconds after operation is stopped, another try will be made. Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by removing the plug and cutting the power.
(2) DC overcurrent detection, AC overcurrent
detection To protect against overcurrent due to sudden changes in load, the compressor
is stopped if the set value (29 A: AE-X138E, AU-X138E / 24 A: AEX108E, AU-X108E)
DC is exceeded in the DC section, or the set value (15 A: AE-X138E, AUX138E /
11 A: AE-X108E, AU-X108E)AC is exceeded in the AC section. In this case, the
outdoor fan does not stop, and 170 seconds after operation is stopped, another
try will be made. Three retries are allowed. On the fourth retry, a complete
stop request signal is sent to the indoor unit, and the outdoor unit will
remain stopped until reset is performed. At this time, the 3-minute delay for
control of the outdoor unit will not function; therefore, do not cancel by
removing the plug and cutting the power.
Compressor protector control
If the temperature of the compressor chamber exceeds 114°C, the compressor is stopped. In this case, the outdoor fan does not stop, and when the compressor chamber temperature decreases to 100°C three minutes after operation is stopped, another try will be made. Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by removing the plug and cutting the power.
Power transistor module protector
If the temperature of the chips in the power transistor module exceeds 110 °C, the compressor is stopped. In this case, the outdoor fan does not stop, and when the temperature of the chips in the power transistor module decreases to 110 °C 170 seconds after operation is stopped, another try will be made. Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by removing the plug and cutting the power.
If the temperature of the compressor chamber exceeds 114°C, the compressor is stopped. In this case, the outdoor fan does not stop, and when the compressor chamber temperature decreases to 100°C three minutes after operation is stopped, another try will be made. Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by removing the plug and cutting the power.
Power transistor module protector
If the temperature of the chips in the power transistor module exceeds 110 °C, the compressor is stopped. In this case, the outdoor fan does not stop, and when the temperature of the chips in the power transistor module decreases to 110 °C 170 seconds after operation is stopped, another try will be made. Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by removing the plug and cutting the power.
BREAK DOWN DIAGNOSIS PROCEDURE
Self-diagnostic procedure using display mode If the timer lamp blinks during operation, the problem can be diagnosed using the following table.
Note: 1. Normal : Only the timer lamp blinks. Error : Displayed by blinking of run lamp (above table).
2. If the power plug is removed from the outlet or the breaker is switched to "OFF", the self-diagnostic memory will be erased.
3. Example of outdoor unit LED 1 blink
Self-diagnostic procedure using display mode If the timer lamp blinks during operation, the problem can be diagnosed using the following table.
Note: 1. Normal : Only the timer lamp blinks. Error : Displayed by blinking of run lamp (above table).
2. If the power plug is removed from the outlet or the breaker is switched to "OFF", the self-diagnostic memory will be erased.
3. Example of outdoor unit LED 1 blink
Display by
outdoor unit lamp LED 1
|
What to check, procedure
|
Solution
|
Once
|
Does
compressor active ? Does it go off immediately after active ?
|
1.
Apply an external shock to the
compressor. 2. Replace the compressor. |
Twice
|
1.
Is the discharge outlet of the outdoor unit clogged ?
2. Is the power supply voltage at least 198 V at full power operation ? 3. Check for refrigerant leaks at the tubing connections. 4. Measure the resistance of compressor thermistor TH1 on the outdoor unit . 5. Measure the resistance of heat exchanger pipe thermistor TH2 on the indoor unit. |
1.
Clear the discharge outlet.
2. Assure power supply voltage. 3. Refill to rated amount. 4. Replace the outdoor ther-mistor assembly. 5. Replace the indoor control board assembly or only TH2. |
3
times
|
1.
Check the circuit in the power transistor module.
2. Is the outdoor fan revolving ? |
1.
Replace power transistor
module |
4
times
|
1.
Measure the resistance of thermistor TH2 on the outdoor unit
|
1.
Replace the outdoor thermistor
assembly. |
5
times
|
1.
Are the connectors of the outdoor unit thermistors well attached ?
2. Measure the resistance of thermistors TH1 and TH2 on the outdoor unit |
1.
Reattach.
2. Replace the outdoor thermistor assembly. |
6
times
|
1.
Can voltage be detected at the current transformer on the outdoor
unit control board? |
1.
Replace the outdoor control board
assembly (Current transformer wire break.) |
7
times
|
1.
Is the discharge outlet of the outdoor unit clogged ?
|
1.
Clear the discharge outlet.
|
8
times
|
1.
Measure the resistance of indoor heat exchanger thermistor TH2.
2. Is the switching transistor of 4 way valve functioning normally ? 3. Is the 4 way valve functioning normally ? |
1.
Replace indoor heat exchanger
thermistor. 2. Replace outdoor units control board. 3. Replace the 4 way valve. |
SCHEMATIC DIAGRAM
