Bosch 500 WFVC6450UC/19 E:12 error slow fill

[hi-Phile]

Washing machine just recently started reporting E:12 and won't complete a wash cycle on Cold.  The laundry soap cup drawer wouldn't wash the detergent away.  Setting the machine to Warm or Hot will fill the tub, but the rinse cycle will error out with E:12. 

The paper guide under the machine cover says the following for Er:12:

Fault/Fault description             Remarks, possible cause

Water inlet time exceeded       No water within 6min, Damaged valve, Wire harness, Blocked hose

Results

- check water supply

- check valve

- check hose

Test program

P:09 -> Pressure switch

P:13 -> Valves

There is a section on entering test mode.  I followed it and was able to put it into test mode, and scroll through the errors too.  The E:12 appears with C:003 which indicates this is the count of the error.  Also the error d:06 appears 1 time, which indicates NTC-relay failure, but since that only occurred once the thermistor probably encountered a condition, as also there was a dr:11 error 1 time, which indicates Voltage too low, due to a possible weak power supply and check line voltage.

The other important area was entering the test mode and to run the Test Program.  I went ahead to test the P:09 and P:13, but I didn't know what the message returned after the test it wasn't on this single troubleshooting sheet.  For P:09 the test ran and showed 63, then at the end of the test, it showed 88.  For test P:13, showed 63, 88, then finally 177.  In any case, it seems point to a faulty cold fill valve, since I tested the water flow at the valve inlet and it has plenty of pressure and the water flows rapidly.  We don't have well water, we have city water, and a water softener since we have higher TDS mineral content in our water.  I checked the inlet screen, it is clear of any debris and doesn't appear to be clogged there.

Thanks for any help, I hope someone else can learn from my experience too.

[Scottekarate]

What water pressure are you checking? Are you pointing The inlet hose into a tub and running that? 

MOST washers these days have all cold rinses. So if your cold water fills slowly, its likely timing out. Whatever pressure sensor or switch that the unit is equipped with is not satisfied in X amount of minutes and the control throws a code. Its a common repair on all washers.

Start a cycle with just cold water and watch it and listen. You should be able to hear the water coming in quickly. You said hot water works, compare one to the other.

[hi-Phile]

I'm checking the Cold water inlet pressure, it's not rushing in using the cold water setting when it the hose is connected to the cold water inlet. When the hose is put into the sink, the pressure is there and very forceful.  So it's timing out because the cold water valve isn't opening fully.  Hot and Warm actually are both having sufficient pressure, unlike the Cold water.

[hi-Phile]

I ordered and received a replacement Cold water inlet valve.  The part number and description are:

B016NBZ9XW 00422244 Washer Cold Water Inlet Valve Original Equipment (OEM) Part

I shut off the cold water valve where the washer hose was attached.  I then kept a small bucket under the hose inlet valve to disconnect the cold water hose at the inlet valve.  I then used a T20 Torx head screw driver to unscrew the two rear lid screws.  Lifted the top lid of the washer from the rear and then pulled out the lid and set it aside.  I then disconnected the three wire cable connector, and two small wire hose clamps that are attached to the water valve.  I put a small towel under the valve to catch any water that would come out of hoses when I disconnected them both from the valve.  I then pushed the the tab from the inside out so that I could slide the valve to remove it from the mount on the back panel.  The tab once pushed out, then slide the valve in the same direction to be able to remove the valve.  Installation is the reverse of the above.

After the valve was replaced, the Cold water and Rinse cycles all work without any problems.