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 3 minutes even after 7-minute to 15-minute since the heating test run has started.
2. Error Diagnosis
|1-1||Service valve inside the outdoor unit closed||Yes||Open the service valve|
Adjustment to refrigerant change
|2-1||Not additional refrigerant charged||Yes||Additional refrigerant charge|
Blockage in refrigerant circuit
|3-1||Are the tubes clogged?||Yes||Avoid clogging|
|3-2||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.)||Yes||3-3|
|No||Replace the electronic control valve|
|3-3||As the second detection is not done, restart and see what happens if there is no error.|