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Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

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  • RJARRRPCGP
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    Originally posted by beetle1303 View Post

    *for some reasons, I frequently get this error when uploading pics:

    Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 27000001 bytes) in /home/badcaps/public_html/forum/includes/class_image.php on line 2390

    Any idea why this is happening?
    That's strange, I've had no problems uploading images during the last time I uploaded photos.

    I think it's because they are being shrunk for me...
    Last edited by RJARRRPCGP; 04-19-2020, 11:08 PM.

    Leave a comment:


  • budm
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    "When probed at the cable connector, it measure 1.58k ohm, but when power up and probed at the connector pluck back onto the controller board, it measured 0 ohm, ~2VDC.. "
    You do not perform resistance reading when the circuit is powered, you can easily damage your meter. Please read your meter user manual.
    Last edited by budm; 04-19-2020, 10:58 PM.

    Leave a comment:


  • beetle1303
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    Yes - the sensor is a defrost sensor. There is another similar on at the ice maker in freezer compartment. When probed at the cable connector, it measure 1.58k ohm, but when power up and probed at the connector pluck back onto the controller board, it measured 0 ohm, ~2VDC..

    Shorted?

    On the compressor:
    I measured the voltages among the 3 pins - they all read ~160VAC. I am curious about DC - and they all read ~180VDC..

    I also measured:
    Incoming ~240VAC
    Reactor 0 ohm
    Over-voltage Protector 0 ohm

    I connect a lead wire onto the blue and brown connector of the over-voltage protector, it measured 0 VAC/DC...

    *all these while, the compressor is still humming and vibrating, but not hot..

    Does it sounds like the compressor is mechanically jammed?

    Leave a comment:


  • R_J
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    The compressor is a variable speed by the looks of it, 240v 57~240hz, the control board is basically a variable frequency drive that runs the motor. You should be able to measure the AC voltage VtoU, VtoW, WtoU, should show aboout 240vac

    I am guessing that is the defrost sensor?

    Leave a comment:


  • beetle1303
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    Ahh!! Thank you thank you

    Please see the pic of compressor and temperature sensor.

    What type of sensor is this, and what would be the temperature at 25c and 0c?
    Attached Files
    Last edited by beetle1303; 04-19-2020, 10:27 AM.

    Leave a comment:


  • stj
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    sounds like your picture is too large

    Leave a comment:


  • beetle1303
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    This is a 240V DC compressor? So should I be checking for DC voltages into the 3 pins?

    *for some reasons, I frequently get this error when uploading pics:

    Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 27000001 bytes) in /home/badcaps/public_html/forum/includes/class_image.php on line 2390

    Any idea why this is happening?

    Leave a comment:


  • beetle1303
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    After listening more carefully to the compressor, I think the humming and vibration is quite low and consistence. I can also hear gurgling noises around the evaporator.

    After power up and running for a few minutes, I gave the compressor a few hard knocks with a hammer (over a thick magazine). Nothing happens...

    The resistance between the 3 compressor pins all read 9.4ohm.

    I am not certain about how to measure the voltage going to the compressor. This is what I think:
    1. set DMM to AC
    2. poke to black probe into pin 3 (blue)
    3. poke the red probe into pin7 (white), pin9 (black), pin11 (gray) respectively

    Is this correct?

    How do I check the overload protector and reactor?
    Attached Files
    Last edited by beetle1303; 04-19-2020, 06:50 AM.

    Leave a comment:


  • R_J
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    This inverter fridge uses a 3 phase compressor motor, check the connections on the inverter board, Try checking the a/c voltage going to the motor, also check the resistance of the 3 motor windings. Also check the overload protector and reactor.

    If you suspect the compressor is locked, sometimes you can tap it with a rubber hammer and see if it will start.

    If a sensor was bad, it would tell the control board to either never start the compressor, or it would run all the time freezing everything

    To upload pictures, click on Go Advanced, then click on the paperclip (next to the smile face) then upload your pictures.
    Attached Files
    Last edited by R_J; 04-18-2020, 10:44 AM.

    Leave a comment:


  • beetle1303
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    I am assuming you are referring to the start relay at the control board since this is a inverter compressor. How do I check if it is good or bad?

    Also, what about the temperature sensor - do they look normal based on DMM test outcome?

    ** is there a problem with uploading pics? I still get error when uploading...

    Leave a comment:


  • stj
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    if the compressor works and you dont have a fluid leak - it works.

    so i'd say the compressor is stuck or the starting relay/cap is bad and the noise your hearing is the compressor trying to get enough momentum to start.

    Leave a comment:


  • beetle1303
    replied
    Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    Having problem uploading pics - will try again later...

    Leave a comment:


  • Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

    I have a 7-year old Panasonic inverter refrigerator model NR-BY602XS that went from working normally to completely not cold air overnight (both freezer and refrigerator compartments...

    The service manual instruction on Self Diagnostic Test seems to indicated Compressor faulty or locked. But the compressor seems to be working with humming sound and vibrating at variable speed and noise level..

    Everything else seems to be working normally - power cycled a few times has no effect. All the interior lights, and fan are working. I dismantled the interior panel to expose the evaporator and fan (the condenser unit is concealed). The fan runs continuously, but the evaporator does not feel cold at all.

    I did a quick visual check on the controller board - nothing looked obviously bad. I check all the capacitors and all tested OK around the capacitance value.

    After reading some online postings, one of the test I did was checking the temperature sensor - one attached at the evaporator coil, and the other at the ice-maker compartment. Both sensor read around 1.5kOhm at room temperature (around 26-28c). I dipped one of them into a cup ice-water, and the reading went up quickly, and stabilized at 5.8kOhm, after a minute or so.

    I can't find the specs for this particular temperature sensor (see pic), but most the I found online indicate should be around 5kOhm at 25c and 16kOhm at 0c.

    Could these temperature sensors be faulty and causing the fridge not cold completely?

    Any other test to find out way it stopped cooling completely?
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