Why draining hot water when filling - Maytag MAH6500 Neptune Front Loading Washer w/Built in Water Heater

First, make sure that both hot and cold water valves are turned on.

The F20 error code is indicating that the water level switch is not detecting a change in the water level while filling. You mentioned that you raised the drain hose so that it's only 3-4 down inside the drain pipe. If the stand pipe is too low it still could siphon out. Watch the end of the drain hose while it's filling with water to see if water is gravity draining out while it is filling.

If the washer is filling with water and you see no water draining out the hose while it's filling most likely it would be a stuck water level pressure switch or the water flow meter.

THE COLD AND HOT WATER CANT GO BACK IN TO THE WATER VALVE ! NOW IF THE DRAIN WATER COMES BACK IN AFTER DRAIN MODE LEFT DRAIN HOSE UP A FOOT TALLER THIN THE WASHER OR CLEAN YOUR PUMP THIRS A CAP ON THE PUMP YOU CAN REMOVE TO CLEAN . NOW IF THE WASHE IS FILLING UP WITH WATER WHEN ITS OFF THE WATER VALVE IS BAD

1. Close hot water valve behind washer.
2. Remove hot water line from washer side and place it in the drain.
3. Open hot water valve to ensure pressure and hotwater is ok in your drain.
4. If not, problem is home related.
5. If pressure and hotwater are ok, then see if your fill valve filter is clogged where you disconnected the hotwater hose attached to the machine.. Its called a fill valve. Sometimes they get clogged.
6. If the hot water side of fill valve looks ok with no blockage, then you might be looking at a new fill valve.

u need a new cold water valve, if u check the temp of the water while its filling it is mainly hot, or u have the hot nd cold hoses on the wrong way , as all rinses r cold

replace the valve

Filter blocked on the hot fill valve inlet

Solenoid not lifting within the valve

Clean the first

Replace the second

If you clear the drain, the water will not fill up again. (try hot, but not boiling, water, forced into the drain hole with a turkey baster) When drain is clear, water will run into the drain pan located near the compressor. The fan will cause that water to evaporate.

Hi. The above machine stops mid cycle and drain/fill light is on, also error code F3E, have cleaned both hot and cold water inlet filters, also checked drain pump and drain line, all ok. Machine drains with no issues and fills with hot water, runs for a while then shuts down.
Any ideas?

You may have a siphoning problem. Double check your drain hose and make sure it's not shoved down in the standpipe too far. The standpipe is the drain line at the wall. If your drain hose is placed too deep into the standpipe, or if you have the top of the standpipe sealed off, the washer will begin to fill and continue to drain at the same time. The symptom will appear as if the washer is constantly filling. You need to leave an air gap opening around the rim of the standpipe, and the drain hose should only be placed about 4 to 6 inches into the drain line. I hope this helps you. Post back if this is not the problem you are experiencing and I will try to provide you with a better solution. Let me know if you have any questions.

If the washer doesn't fill properly, or if only one temperature of water fills the tub, something is probably keeping water from entering the machine or it's draining before the tub fills completely. Set the controls to the first wash cycle, and then try each water temperature setting. If both hot and cold water seem to be entering the washer with good pressure, water may be draining out prematurely during the fill cycle, through siphoning action. Be sure the drain hose's connection to the standpipe is at least 34 inches above the floor (otherwise, discuss the problem with a plumber). An air gap between drain hose and stand pipe that prevents backflow is also good to have. If hot works but cold doesn't, or vice versa: 1) Be sure both the hot and cold water faucets are turned on. 2) Be sure the supply hoses are not kinked. 3) Turn off the faucets. Unscrew the hoses from the faucets and drain them into a bucket. Hold the bucket under the faucets and test them to make sure they both work and have plenty of pressure (see HERE for information on replacing faucets). Screw the hoses back onto the faucets. 4) Unscrew the hoses from the inlet valves and clean the filter screens just inside them; these may be clogged. To do this, pry out the screens with a screwdriver (this can be difficult; the screens may be inside the valves), flush them under running water, then put them back into the hose. If the screens look defective, replace them. Then screw the hoses back onto the valves. Be careful not to cross-thread the hose threads when screwing them back onto the valves. 5) Call an appliance repairperson; there may be a defective inlet valve or a problem with the controls.