Panasonic U-4LE1E5 Service Manual page 131

4. Mini VRF System Alarm Codes
3. Mini VRF System Alarm Codes
P13 Forgot-to-open Valve Alarm
1. Error Detection Method
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.
2. Error Diagnosis
1 Service
valve
1-1
2 Adjustment
to
2-1
refrigerant
change
3 Blockage
3-1
in
refrigerant
circuit
3-2
3-3 As the second detection is not done, restart and see what happens if there is no error.
5
Service valve inside the outdoor unit closed
Not additional refrigerant charged
Are the tubes clogged?
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.)
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Mini VRF SYSTEM
Mini VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis
Open the service
Yes
valve
No 2-1
Additional
Yes
refrigerant charge
No 3-1
Yes Avoid clogging
No 3-2
Yes 3-3
Replace the
No electronic control
valve
5