Panasonic WU-216MF2U9 - Service Manual - Page 170
H06 Alarm, Alarm code, Refrigerant is accumulated in a state of stop mode of the outdoor units.
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3. 3WAY Alarm Codes 3WAY VRF SYSTEM Trouble Diagnosis H06 Alarm Alarm code H06 Alarm meaning Low pressure is too low. Alarm conditions • Low-pressure sensor detects lower than 0.06MPa continuously for 2 minutes or lower than 0.02MPa for just a moment. Probable cause (1) Low-pressure sensor failure (2) Failure to open the service valve of the outdoor unit (3) Clogged refrigerant circuit (4) Insufficiency of refrigerant gas amount (5) Refrigerant is accumulated into the stopped outdoor units. Check (1) L ow-pressure sensor failure Remove the socket of low-pressure sensor from the Outdoor Unit Control PCB and measure the resistance of each wire (×3) and between the outdoor unit and earth. 1 If this resistance is more than 95kΩ - 105kΩ, it indicates normal. If not, replace the sensor. • Connect a gauge to the low-pressure outlet and check for changes in the value displayed by the monitoring software, and for large deviation of the gauge pressure. (2) Failure to open the service valve of the outdoor unit Check the open/closed status of the service valve. (3) Check for clogging of the refrigerant circuit. When clogging in the refrigerant circuit occurs, refrigerant does not return to the compressor. 2 As a result, low-pressure may occasionally decrease abnormally. Then check the following points: Solenoid valve, expansion valve, fleezing caused by contaminated water inside the circuit, etc. (4) Insufficiency of refrigerant gas When insufficiency of refrigerant charge amount or of refrigerant amount in the system caused by gas leakage occurs, low-pressure may occasionally decrease abnormally. 3 (5) Refrigerant is accumulated in a state of stop mode of the outdoor units. Leakage of expansion valve and solenoid valve in the outdoor unit in stop mode, etc. Correction (1) Replacement of low-pressure sensor When replacing a low-pressure sensor, carry out after refrigerant recovering of outdoor unit. (2) Correct malfunction of refrigerant cycle. • Open valve of outdoor unit. 4 • Correct clogging. • Dissolve insufficiency of refrigerant gas (Correction of gas leakage area, additional refrigerant, etc.) When charging additionally because of refrigerant insufficiency, add each 17.6oz (500g) of refrigerant little by little. Example • The alarm had occurred because of refrigerant insufficiency due to gas leak. 5 • The alarm had occurred when the liquid, suction and discharge tubes were clogged together. 6 7 8 9 5 - 18