Panasonic U-72MF2U9 Service Manual

Also see for U-120MF2U9: Installation instructions Operating instructions Installation instructions Technical data

Contents

3WAY VRF SYSTEMTest Run6 - 171234567898. Self-Diagnosis Function Table andContents of Alarm Display• If the alarm display “E15”, “E16” and “E20” appear after auto address setting began, check the following items.Alarm display Alarm contentsE15 Recognized number of indoor units at the time of auto address setting are fewer than that of indoor unitsset by SW3 and SW4 on outdoor main unit P.C. board.E16 Recognized number of indoor units at the time of auto address setting are more than that of indoor unitsset by SW3 and SW4 on outdoor main unit P.C. board.E20 Outdoor unit could not entirely receive serial communication signal from the indoor unit within 90seconds after auto address setting began.Check E15 E16 E20Have you forgotten to turn ON power to indoor unit?Are indoor and outdoor control wiring connected properly?(Check for incorrect wiring to open & short-circuit, terminal pin and remote control terminal.)Is remote control wiring connected properly? (Check for open & short-circuit, wrong connectionto indoor/outdoor unit control wiring terminal, inter-unit control wiring.)Are the number of the connecting indoor units set by SW3 and SW4 of outdoor main unit controlP.C. board connected properly?Is additional appropriate amount of refrigerant charge?(Compressor ON at the time of auto address setting)Is the refrigerant tubing connected properly?(Compressor ON at the time of auto address setting)Are E1 and E3 sensors of indoor unit normal?(Compressor ON at the time of auto address setting)Are there any wrong system address installed in indoor units caused by manual or incorrect autoaddress control?1) When auto address setting from outdoor main unit control P.C. board or remote controller begins, “Under Setting” appears on theremote controller as for normal indoor units under the inter-unit control wirings and remote control wirings.LEDs 1 and 2 indicators on outdoor main unit control P.C. board blink alternately.2) If there is an error at the inter-unit control wiring of the remote controller when in the indoor unit group control, address settingmay not occasionally be made although “under setting” is displayed.3) Although the alarm “E15” and “E16” are displayed, addresses will be installed in the recognized indoor units.The installed addresses can be checked by the remote controller. See the section “Checking the indoor unit address”.• When operating the remote controller after auto address setting completed (LEDs 1 and 2 indicators on outdoor main unit controlP.C. board go out), correct the symptom if the following alarms appear on the remote controller.Remote control display CauseNo display Remote controller is not connected properly. (Power failure)When auto address setting was completed, the power of indoor unit was turned off.E01Indoor unit does not respond to remote controller.Indoor unit address was mistakenly controlled by undesired indoor unit remote controller.(Impossible to communicate with outdoor unit)E02 The remote controller is having error in sending serial communication signal.(Impossible to communicate with indoor unit by remote controller)P09 Connection to the panel of indoor unit is not good.If any other alarm appear on the display, see the section 5.• Alarm display can be checked by the outdoor maintenance remote controller. When operating, see the section 5.Alarm display can also be checked by number of blinking of LEDs 1 and 2 on outdoor unit control P.C. board.See the section “How to know LEDs 1 and 2 alarm display on outdoor unit control P.C. board” under the section “8. Self-Diagnosis Function Table and Contents of Alarm Display”.Remote control display Alarm contentsE01 Indoor unit does not respond to remote controller.E02 The remote controller is having error in sending serial communication signal.E03 Controller does not respond to indoor unit.E04 Oudoor unit does not respond to indoor unit.E06 Some indoor units does not respond to outdoor unit.E08 Indoor unit address is dupulicating.