Fujitsu AUXB04GALH Service Manual page 142

Trouble shooting 64
OUTDOOR UNIT Error Method:
High Pressure Protection 1
Detective Actuators:
High pressure switch 1
Forecast of Cause :
1. 3-way valve not opened 2. Outdoor unit fan operation defective, foreign matter at heat
exchanger, excessive ambient temperature rise 3. Check valve clogged
4. EEV defective, strainer clogged 5. Solenoid valve defective
6. High pressure switch 1 defective 7. Refrigerant overcharged
<Cooling operation>
Check Point 1 : Check if 3-way valve(liquid side) is open.
If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.
O K
Check Point 2 : Check the outdoor unit fan operation,
heat exchanger, ambient temperature
No foreign matter in air passage?
Heat exchange fins clogged
Outdoor unit fan motor check
Ambient temperature not raised by effect of other heat sources?
Discharged air not sucked in?
OK
Check Point 3-1 : Check the EEV, strainer
EEV(EEV 1) open?
Strainer clogging check. (before EEV)
Refer to "Service Parts Information 9".
OK
Check Point 3-2 : Check the check valve
Check if check valve (oilseparetor (out) of compressor 1)
is not clogged.
OK
Check Point 4 : Check high pressure switch 1
High pressure switch 1 characteristics check
* For the characteristics of the high pressure switch 1, refer to "Service Parts Information 16".
OK
Check Point 5: Check the refrigerant amount
Refrigerant charged amount check
Indicate or Display:
E. A4. 2
Outdoor Unit : E. A4. 2
Indoor Unit
Error Code
Detective details:
"Protection stop by "high pressure switch 1 operated during compressor 1
operation"" generated 3 times within 60 minutes
04-72
: Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
: A4
<Heating operation>
Check Point 1 : Check if 3-way valve(gas side) is open.
If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.
O
Check Point 2 : Check the EEV, strainer (indoor unit)
EEV operation check
Check of strainers before and after EEV
Refer to "Service Parts Information 8".
OK
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