U-4LE1E5, U-4LE1E8, U-5LE1E5, U-5LE1E8, U-6LE1E5, U-6LE1E8, S-15M, S-22M, S-28M, S-36M, S-45M, S-60M, S-73M, S-90M, S-106M, S-140M, S-160M - Panasonic Air Conditioner Service Manual (repair manual). Page 127

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Detection is performed only in the test run. When once detected or the test run finished without any error, 
the second detection will not be done. 
In case of forgetting to open a valve, P04 (high-pressure switch operational alarm) is occasionally preceded due to the 
following conditions.

The status of small temperature change of the oprating indoor unit continues for 3 minutes even after 5-minute to 
15-minute since the cooling test run has started.

•

The status of small temperature change of the oprating indoor unit continues for 3minutes even after 7-minute to 
15-minute since the heating test run has started.

•

1-1

2-1

Yes

No

1 Service 

valve

Open the service 
valve

2-1

2 Adjustment 

to 
refrigerant 
change

3 Blockage 

in 
refrigerant 
circuit

3-1

Avoid clogging

3-2

Yes

No

Are the tubes clogged?

Not additional refrigerant charged

3-1

Yes

No

Additional 
refrigerant charge

3-2

3-3

Replace the 
electronic control 
valve

Yes

No

Is the outdoor unit’s electronic control valve operating correctly? 
(Check for debris clogging the electronic control valve, a problem 
with the electronical coil and/or the control PC board.)

3-3

As the second detection is not done, restart and see what happens if there is no error.

Service valve inside the outdoor unit closed

SM830195-03_Mini VRF SYS.indb   43

SM830195-03_Mini VRF SYS.indb   43

2014/09/04   13:36:31

2014/09/04   13:36:31