Getting an F4 fault code after about 1 -2 minutes of operation. There is actually water in the bottom of the unit. Have put a vacuum on the inlet feed tubing and also have blown compressed air through the water inlet tubing (after powering up so as to open the solenoid) and there does not seem to be any blockages. Thanks, Mike

F1? Water supply/low water fill ?· Check water supply to machine
?· Replace water inlet valve "F2? Water level too high ?· Plugged/Bad water pump
?· Faulty water valve "F3? Pump problem Check pump trap and clean. "F4? Thermistor problem ?· Open thermistor, replace
?· Bad wiring to thermistor "F5? Fault in thermal cutout or heating pause fault. Selected temperature not reached in 90 minutes ?· Check heating element
?· Check thermostat "F6? Motor fault ?· Check wiring to motor
?· Replace motor if necessary "F7? Door lock release fault ?· Bent pull-rod for door latch
?· Bad door latch solenoid "00 00? Machine did not spin Check load for out of balance Redistribute load and restart

it's a water problem.is water filling into the washer or no water?
FH No water detected entering machine or Pressure switch trip not detected. If after 30 seconds the control does not detect water entering machine and then valves will be turned off and the error code will be displayed.
Or
If the control has turned the water valves on and after 8 minutes the flow meter has detected 10.5 gallons of water passing through it, but has not detected the pressure switch trip, the valves will be turned off and the error code will flash.

Press PAUSE/CANCEL twice to clear the display.

Potential Causes

• If there is no water in the unit:
- Make sure that both valves at the water source(s) are turned on all the way.
- Check for plugged or kinked inlet hoses or plugged screens in the inlet valves
- Verify inlet valve operation
• If there is water in the unit:
- Verify Drain pump operation
- Pressure Switch Hose is in good condition and properly connected to Tub and Pressure switch

• Verify there is not a siphon problem
• Verify wire harness connections to; Inlet Valves, Pressure Switch, Drain Pump, Flow Meter, and Central Control Unit (CCU)
• Check all hoses for possible leaks
• Verify pressure switch operation
• Verify flow meter operation
• Verify CCU operation

Replace failed component.

Read more: http://www.appliancepartspros.com/repairtips/repairtips_appliance+fault+codes.aspx#Sears / Kenmore Fault Codes#ixzz1pUAisxSH
http://www.appliancepartspros.com

If your bottom drawer works fine then your inlet water valve below the bottom drawer is bad. Click on the link below to see how to repair this dishwasher.

Appliance Repair Video

FH: If after 30 seconds the control does not detect water entering
machine, the valves will be turned off and the error code will be
displayed. OR If the control has turned the water valves on and after
8 minutes the flow sensor has detected 10.5 gallons of water passing
through it, but has not detected the pressure switch trip, the valves will
be turned off and the error code will flash.
Press PAUSE/CANCEL twice to clear the display.
If there is no water in the unit:
-Make sure that both valves at the water source(s) are turned
on all the way.
-Check for plugged or kinked inlet hoses or plugged screens in
the inlet valves.
-Verify inlet valve operation.
If there is water in the unit:
-Verify drain pump operation.
-Verify that the pressure switch hose is in good condition and
properly connected to tub and pressure switch.
1. Verify there is not a siphon problem.
2. Unplug washer or disconnect power.
3. Verify wire harness connections to inlet valves,
pressure switch, drain pump, flow meter, and
Central Control Unit (CCU).
4. Check all hoses for possible leaks.
5. Plug in washer or reconnect power
6. Verify pressure switch operation.
7. Verify flow meter operation by blowing air through the part and
measuring the resistance.
8. Verify CCU operation by running a Diagnostic test or any cycle.

Your tech sheet is behind the service panel How to Access it.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

I have not seen this but from the online fault code listing says that these are the conditions for the failure:

No water detected entering machine or Pressure switch trip not detected.

If after 30 seconds the control does not detect water entering machine and then valves will be turned off and the error code will be displayed.

Or

If the control has turned the water valves on and after 8 minutes the flow meter has detected 10.5 gallons of water passing through it, but has not detected the pressure switch trip, the valves will be turned off and the error code will flash.

And the things to check are:

Press PAUSE/CANCEL twice to clear the display.
If there is no water in the unit:
Make sure that both valves at the water source(s) are turned on all the way.
Check for plugged or kinked inlet hoses or plugged screens in the inlet valves
Check inlet valve operation
If there is water in the unit:
Check Drain pump operation
Pressure Switch Hose is in good condition and properly connected to Tub and Pressure switch
Check there is not a siphon problem
Check wire harness connections to:Inlet Valves, Pressure Switch, Drain Pump, Flow Meter, and Central Control Unit (CCU)
Check all hoses for possible leaks
Check pressure switch operation
Check flow meter operation
Check CCU operation

• If there is water in the unit:
- Verify Drain pump operation
- Pressure Switch Hose is in good condition and properly connected to Tub and Pressure switch

• Verify there is not a siphon problem
• Verify wire harness connections to; Inlet Valves, Pressure Switch, Drain Pump, Flow Meter, and Central Control Unit (CCU)
• Check all hoses for possible leaks
• Verify pressure switch operation
• Verify flow meter operation
• Verify CCU operation

Replace failed component.

Read more: http://www.appliancepartspros.com/repairtips/repairtips_appliance+fault+codes.aspx#ixzz0ufpGdihe
http://www.appliancepartspros.com hope this helps

On a Whirlpool ADP4731 dishwasher, try this...
Double check that the under-sink valve is open, providing hot water to the dishwasher.
If it is, the water inlet valve should be checked for proper operation.
The F4 error code means "drainage fault" which should be checked after the water inlet problem has been resolved.
Good Luck!

Hello lilo1
Welcome


You said, You are getting an error code F/H but it works most of the time. Then it just quits
You may have low water pressure which the machine senses and after some minutes will shut down .
If any pump runs with insufficient water pressure it will burn out the pump so washers are made with auto shutoff's in those case it does shut off.
Check that the water valves are passing water out of the taps that are connected to the washer and they did not fail.
When you remove the water supply hose from the washer inlet, you will probably find the screens in the washer water inlet are blocked and need to be removed and cleaned off and then replaced.
Do not bend them up and you can re use them!
Below are causes and more remedies
Let me know how it goes!
Huuum
Please remember to leave a rating?





F/H Error code

No water detected entering machine or Pressure switch trip not detected.

If after 30 seconds the control does not detect water entering machine and then valves will be turned off and the error code will be displayed.
Or
If the control has turned the water valves on and after 8 minutes the flow meter has detected 10.5 gallons of water passing through it, but has not detected the pressure switch trip, the valves will be turned off and the error code will flash.





Check/Repair
Press PAUSE/CANCEL twice to clear the display.

• If there is no water in the unit:
  1. Make sure that both valves at the water source(s) are turned on all the way.
  2. Check for plugged or kinked inlet hoses or plugged screens in the inlet valves
  3. Verify inlet valve operation
• If there is water in the unit:
  1. Verify Drain pump operation
  2. Pressure Switch Hose is in good condition and properly connected to Tub and Pressure switch
• Verify there is not a siphon problem
• Verify wire harness connections to:Inlet Valves, Pressure Switch, Drain Pump, Flow Meter, and Central Control Unit (CCU)
• Check all hoses for possible leaks
• Verify pressure switch operation
  
• Verify flow meter operation
• Verify CCU operation

Hi there,

F/H No water detected entering machine or Pressure switch trip not detected.
If after 30 seconds the control does not detect water entering machine and then valves will be turned off and the error code will be displayed.

Or

If the control has turned the water valves on and after 8 minutes the flow meter has detected 10.5 gallons of water passing through it, but has not detected the pressure switch trip, the valves will be turned off and the error code will flash.


Press PAUSE/CANCEL twice to clear the display. 
If there is no water in the unit:
1. Make sure that both valves at the water source(s) are turned on all the way.
2. Check for plugged or kinked inlet hoses or plugged screens in the inlet valves 
3. Verify inlet valve operation 
If there is water in the unit:
1. Verify Drain pump operation
2. Pressure Switch Hose is in good condition and properly connected to Tub and Pressure switch 
Verify there is not a siphon problem 
Verify wire harness connections to:Inlet Valves, Pressure Switch, Drain Pump, Flow Meter, and Central Control Unit (CCU) 
Check all hoses for possible leaks 
Verify pressure switch operation

Verify flow meter operation 
Verify CCU operation.

Failure
Code
Condition
Check/Repair
F/H
No water detected entering machine or Pressure switch trip not detected.

If after 30 seconds the control does not detect water entering machine and then valves will be turned off and the error code will be displayed.
Or
If the control has turned the water valves on and after 8 minutes the flow meter has detected 10.5 gallons of water passing through it, but has not detected the pressure switch trip, the valves will be turned off and the error code will flash.

Press PAUSE/CANCEL twice to clear the display.

• If there is no water in the unit:
  1. Make sure that both valves at the water source(s) are turned on all the way.
  2. Check for plugged or kinked inlet hoses or plugged screens in the inlet valves
  3. Verify inlet valve operation
• If there is water in the unit:
  1. Verify Drain pump operation
  2. Pressure Switch Hose is in good condition and properly connected to Tub and Pressure switch
• Verify there is not a siphon problem
• Verify wire harness connections to:Inlet Valves, Pressure Switch, Drain Pump, Flow Meter, and Central Control Unit (CCU)
• Check all hoses for possible leaks
• Verify pressure switch operation
• Verify flow meter operation
• Verify CCU operational

F4 is a water inlet fault. It doesn't make sense if you have this fault indication with water flowing into the unit. Does the dishwasher drain properly? Usual suspects for an F4 indication would be a clogged inlet line, water supply turned off, bad fill valve, or a control board failure. Let me know if this helps, or give me a little more information on what you have done to correct so far.