Error code 128?

[Hixie]

Today, running the dishwasher for the first time after rebooting it, I got an error code 128 shortly after operatingMode went to 5 (cycle active).

From my app:

GE GDF570SGFWW dishwasher model
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
╔═══════════════════════════════════════════════════════════════════════════════════════════════════════╗
║ Personality: machine-control-driven UI board (specified by factory-configured bootloader parametric). ║
║ Fill rate: 52.6ml/s. Drain rate: 129.5ml/s.                                                           ║
║ Dry drain state: 0 failed dry drains (maximum 1).                                                     ║
║ Continuous cycle mode: cycle 0, 0 remaining cycles. 0m between cycles.                                ║
╚═══════════════════════════════════════════════════════════════════════════════════════════════════════╝

┌────┤ Running • autosense • prewash • autosense program 2:1 ├──────────┤ CLEAN FILTER ├────┐
│ AutoSense  Rinse Aid Enabled                                                              │
│ Progress: ███░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ 9.4% (3/32)                                    │
│ Cycle started at: 2016-07-07 18:32:00.000. Temperature: 23.3°C .. 24.4°C. Just started... │
│ ERROR: <code 128>.                                                                        │
│ Cycle count: 43 cycles completed out of 54 cycles started.                                │
│ Power cycle events: 11.                                            Uptime: 1d 0h 41m 13s. │
│ Door open/close count: 293.                                         Sensors: ▁▇▁▁▁▁▁▁▁▁▁▁ │
└────────────────────────────────┤ 2016-07-07 18:32:57.677 ├────────────────────────────────┘

Event log (most recent first):
     31: Cycle started at: 2016-07-07 18:32:00.000. Duration: 0m.
     30: Booted at: 2016-07-06 17:51:44.342

[johnnysako]

The Rinse Aid algorithm runs shortly after the door is closed. This is expected behavior for your model without the hardware to detect rinse aid level.

[Hixie]

So error code 128 means something failed in the rinse aid algorithm?

[johnnysako]

I apologize for the cryptic response there. Fault Code 128 is logged when Rinse Aid is detected low.

[Hixie]

Ah, ok. Thanks.

I'm not really sure I fully understand what the dishwasher is trying to do. Does it decide the rinse aid was detected low on a timer? Or is it more or less random based on the floating voltage returned from a non-existent sensor? Why didn't it set the rinse aid bit if when, or instead of, setting the error code?

[johnnysako]

Rinse aid detection is based on an algorithm involving the door and a sensor in the d-cup module which your model doesn't get populated. I believe the voltage is pulled to make it appear as though there is no rinse aid. We actually set both the fault and the bit. Given that I have been wondering if the bit you have mentioned that keeps getting after cleared (the clean filter bit) is somehow masked wrong and is actually the low rinse aid bit.

[Hixie]

Ah, interesting. Could be. I've also seen the rinse aid bit get set though.

Would it matter maybe if the "use rinse aid" mode was on or off? I have had that one set to both states in the past (as part of checking that i can read that state).

[johnnysako]

Looks like we don't check for rinse aid at all if the mode is off.