When my wife started a cycle, it initially added water, but after about 10 minutes, the cycle had stopped and it was displaying the FH error code (apparently after the second time in the cycle when it adds water). Subsequent attempts to run a cycle did not add ANY water, and would display the FH code within a minute or so.

I verified the water supply valves are on, the inlet screens are clean (new inlet valve!), and the pump strainer/filter is clean.

I ran the diagnostic test, and at Step C:01 (tests flowmeter and cold water inlet valve), the test displayed code FH. I restarted the test and skipped over this step so the rest of the tests could be run. It next stopped at C:03 (tests hot water inlet valve)--FH code. I restarted and skipped past C:03, and it stopped at C:05 (test heater if present (not on mine), and if there is not enough water in the tub, it adds water)--FH code. I restarted and skipped past C:05 and it completed the remainder of the diagnostic tests with no error messages. Since the only steps flagged were those where water was supposed to be added, it sounds like a bad water inlet valve, right? No--I replaced that and get the exact same symptoms.

Since I had similar symptoms about 2 months ago, that ended up being a bad drain pump motor, I tested the motor resistance (OK) and that it was getting voltage (OK), and could see that it tries to pump a small amount of residual water in the drain line, so it is turning. Don't think it's the drain pump.

I then tested the voltage going to both the hot and cold water inlet valve solenoids, and neither is getting voltage when they should be opened. I unplugged and replugged the wiring harness into the control unit to ensure a good connection. I notice that when starting a cycle, the drain pump is running continuously until the error code stops the cycle. The manual description of the pressure switch says "If an overfill condition is detected by the pressure switch, the CCU will turn on the drain pump and attempt to stop filling." So, could the pressure switch be falsely detecting an overfill, and therefore running both the drain pump and preventing water from coming in? I had dismissed the pressure switch because that is only noted as a possible problem for code FH if there is water in the unit, but it is not adding any water, so the pressure switch is not indicated in that case.

Could the pressure switch fail like this--falsely detecting an overfill rather than just not detecting any water?

Any other thoughts?

Thanks in advance for any advice...my wife would be extremely grateful!

Jim

did you ever get if fixed? if so what was the answer?

Ckphoto: Not yet...the flowmeter wasn't it. Trying the pressure switch next. Are you having the same problem?

Maybe you had a bad connection and disconnecting/reconnecting fixed it. Or, a couple months ago, I had the exact same symptoms, which turned out to be a bad drain pump motor, but initially, it was intermittent. Sometimes the motor would hang up, then work again. When you first start a cycle, the drain pump kicks on, so if it doesn't work at that point, or at any other point in the cycle where the drain pump kicks on, it will give the FH error. When I first checked the motor resistance it was OK, and after several more failed cycles where it would FH at various points in the cycle, the motor resistance showed it was bad. Replaced the motor and it worked after that, until this new problem. (Most places only have the combined pump housing and motor for $150. I found one place online that sold the motor separately for ~$50. I had to buy a new o-ring at a hardware store to go with it, but that did the trick.) Good luck not having a recurring problem!