Heat Ex.2 Gas Temp. Error; Heat Ex.2 Gas Temp. Sensor (Th8) - Fujitsu Airstage VR-II Series Service Manual

Trouble shooting 67
OUTDOOR UNIT Error Method:

Heat Ex.2 gas temp. Error

Detective Actuators:

Heat Ex.2 gas temp. sensor (TH8)

Forecast of Cause :
1. Heat Ex.2 gas temp. sensor (TH8) not installed correct position
2. Heat Ex.2 gas temp. sensor (TH8) defective
3. 4-way valve2 (including a coil) defective
4. EEV2 (including a coil) defective
5. Main PCB defective
Check Point 1 : Check the condition of Heat Ex.2 gas temp. sensor (TH8)
Check the condition of mounting of Heat Ex.2 gas temp. sensor (TH8).
OK
Check Point 2 : Check the Heat Ex.2 gas temp. sensor (TH8)
Check characteristics check. (Disconnect the Heat Ex.2 gas temp. sensor from PCB and check.)
* For the sensor characteristics, refer to the "Service Parts Information 25".
OK
Check Point 3 : Check the condition of 4-way valve2 coil
Check the condition of mounting of 4-way valve1 coil and 4-way valve2 coil.
OK
Check Point 4 : Check the EEV2
Check the condition of mounting of EEV2 coil.
Check the connector connection state of EEV1, EEV2, EEV3 coil.
OK
Check Point 5 : Replace Main PCB
Check the appearance and condition of mounting of Main PCB.
>> If it is abnormal, replace Main PCB.
(When Main PCB is replaced, set up the original setting by Rotary, Dip, and Push SW.)
OK
Check Point 6 : Replace 4-way valve2
1. Fully close the 3-way valve, and the refrigerant is recovered.2. 4-way valve2 is replaced.
3. Perform vacuuming of repaired outdoor unit thoroughly , and add the refrigerant
with the recovered amount.
4. Check if the error reoccurs on a test run.
After fixing the problem and for canceling the Error, Error Reset (F3-40) will be required after power reset
Caution
By changing of DIP SW 4-2 to ON, the Back-up operation can start when the active outdoor unit exists on the multi outdoor unit connection.
(Stand alone outdoor unit is impossible)
The following conditions will be concerned in use of back-up operation. (Please do not use the system with back-up operation for long time.)
- The operating compressor life time becomes shorter.
- The operating performance may drop due to the limited active compressor(s).
- The compressor may stop frequently by protection controlling.
*In order to keep the operating capacity, the release of the Low noise mode setting might be necessary.
Indicate or Display:
EA6. 4
Outdoor Unit : E. A 6. 4
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code : 9 U / A 6
Detective details:
Heat Ex.2 gas temp. sensor (TH8) for use as condenser
(4way valve2:Off, EEV2:Open) is detected abnormally-low to
High pressure saturated temp. for 4 minutes or more.
04-76
Filter LED Continuous Flash.