Fujitsu AIRSTAGE V-II - High Pressure Protection 2

Trouble shooting 58
OUTDOOR UNIT Error Method:
HIgh Pressure Protection 2
Indicate or Display:
Detective Actuators:
Detective details:
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 2 defective 7. Refrigerant overcharged
High pressure switch 2
"Protection stop by "high pressure switch 2 operated during compressor 2
operation"" generated 3 times within 60 minutes
EEV operation check
Check of strainers before and after EEV
Refer to "Service Parts Information 14, 15, 16".
Check Point 4 : Check the EEV, strainer (indoorunit)
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?
Check Point 2 : Check the outdoor unit fan operation,
heat exchanger, ambient temperature
High pressure switch 2 characteristics check
* For the characteristics of the high pressure switch 2, refer to the "Service
Parts Information 21".
Check Point 6 : High pressure switch 2 check
Check Point 7 : Refrigerant amount check
Refrigerant charged amount check
Check Point 5 : Solenoid valve (SV1, SV2) check
Check Point 3-2 : Check valve check
Solenoid valve operation check
Refer to "Service Parts Information 17".
Check if check valve (oilseparetor (out) of compressor 2)
is not clogged.
Check Point 3-1 : Check valve check
Check if check valve (parallel with EEV1) not clogged.
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
Outdoor Unit : E. A4. 3
Error Code : A4
04-66
<Cooling operation>
<Heating 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.
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.
OK
OK
OK
OK
OK
OK
OK
OK