Saturday, October 6, 2018

Neptune MAH5500BWW Code OD

Neptune MAH5500BWW Code OD

Here is a series of emails between Ron and I regarding an issue he was having with his MAH5500BWW Neptune washer...


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Jeff,


Trying to resolve issue where control panel shows code OD after running through complete wash cycle, but begins to leak water from bottom edge of door, and leaves water high in drum unless reset to spin cycle. Earlier code of ND proved to be false after removing pump and checking for any obstructions, then testing motor to ensure function. Door seems to be locked, but if wash cycle stops at code OD, the door can be opened with resulting flood of water from drum.

Is this caused by faulty lock, sensor, or control board failure?

Thanks

 Ron

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Hi Ron,


Might be a couple of issues happening...

It sounds like the pump is working if it drains in a short amount of time.

I wonder why the water level is too high. There could be a water level issue that is allowing the tub to over fill.

For starters, I would try removing all the connectors on the circuit boards and re-seating them which can wipe the connector pins if there is any oxidation. 

Have you located the tech sheet which should be in the top console area? There will be some diagnostics you can run to test the functions.

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Hi Jeff,

Thanks for the prompt reply. I haven’t opened the top of unit yet. Thought the issue was going to be the pump with the original code “ND”. Will follow your advice below and then move onto tech sheet if still having problem.
Will let you know the results.

Ron

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Hi Jeff,

Opened control housing and front of washer today. Pulled all connectors off, then pushed back on to pins in each case. Found no corrosion or debris on connectors or pins. All pin surfaces looked to be bright, not oxidized. Found tech sheet and used it for next steps. Did a continuity check on p3 &  P8 as suggested on tech sheet; continuity showed good.

Placed the washer into diagnostic test mode to see if I could get the door lock to do so and unlock. Pushing the button stated on the tech sheet produced no response for lock or unlock or give a code, as I pushed the door button inward and held it. However, once I fully assembled the front and reattached the door I reset the diagnostic mode and was able to get the door lock to engage and disengage with a satisfying click each time. The door seal appears to be in perfect condition and I checked the small hose from the door seal to drain and found no obstruction.

Next I followed the tech sheet instruction for reading the help codes stored in memory. I’ve listed them below with the number of times they were recorded. The only common denominator I see in the codes is “faulty control board”. When I inspected the control board there was no sign of broken solder, loose components, burned or charred connectors or components.
Codes in Memory                            Number of instances
01 No Drain                                                         3
03 Faulty Door Latch Sensor                        9
05 Faulty Unbalance Switch                         6
05 Faulty Unbalance Switch                         1
17 Faulty Door Switch                                     0
23 (can’t read my note)                                 3

Finally, we previously tried to run a quick load to test the door lock and seal, but had standing water in the drum with door pushed and leaking at bottom. We opened door to reduce water level, then set washer to spin to drain and retrieve load materials. When machine stopped, we pressed the stop button and all control panel lights went dark. We were working nearby and noticed that the washer powered up again and showed double-digit time in display. We pressed stop button again and all lights went dark.  Then washer powered up again and we hit stop, then pulled power cord. I’m pretty sure we caused some of the faulty door latch issues by opening the door and trying to proceed to different cycles without cancelling fully and going back to start.

Your thoughts on this problem would be greatly appreciated.
Thank you,

Ron

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Hi Ron,


First, the machine is either over filling or not draining properly if water is up to the door. Have you verified the discharge hose has good flow when pump should be running?

I would check to make sure the water level pressure switch has the hose going from bottom of outer tub to the pressure switch in the top console area. The hose may have a clog in it and that could cause over filling.

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Hi Jeff,


Checked discharge hose and all other small hoses at top of machine, then double checked 90-degree hose from bottom of outer tub to pump which has water level pressure switch mounted to top of plastic frame which has pump and electronics attached, then twists into bottom pan of washer. All hoses were clear of any debris or small sediment.

Attempted to run a load of light clothing with resulting water level rising above inner tub and pressing door agape at bottom with water flowing onto garage floor and into base drawer. Pressed door tightly against seal and selected spin cycle. Pump evacuated all water from tub and flow from discharge hose was steady as it went into plumbing at wall.

Since no clog is present, it seems that the water level pressure switch may be the culprit. Have ordered part and hope to install Tuesday. Will let you know results. I could not identify hose going from bottom of outer tub to a pressure switch in the top console area on this model; MAH5500BWW. The only switches/valves in top console area seem to be related to the flow of water into the soap/bleach dispensers.

Ron

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Hi Ron,


First, the machine is either over filling or not draining properly if water is up to the door. Have you verified the discharge hose has good flow when pump should be running?

I would check to make sure the water level pressure switch has the hose going from bottom of outer tub to the pressure switch in the top console area. The hose may have a clog in it and that could cause over filling.
  
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Hi Jeff,


The water pressure level switch was the culprit. Replaced with factory part, ran test load without any problem. Repair complete.
Thank you for your advice and blog.

Sincerely,

Ron

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I hope this post was helpful!


Jeff Hartman
"The Neptune Man"