Home › Whirlpool Washer Error Codes › Whirlpool Washer Error Code F35

Whirlpool Washer Error Code F35: What It Means and How to Fix It

Whirlpool Duet washer guide · Decoded from manufacturer documentation · Safe homeowner checks only

What is happening inside the machine

A front load washer measures its water level without ever looking inside the tub. A small rubber hose, called the pressure hose, runs from the bottom of the outer tub up to a pressure switch under the top panel. As water fills the tub, air trapped in that hose is compressed, and the switch converts the rising air pressure into a level signal for the control. The control uses that signal for every decision that depends on water: when to stop filling, when to start agitating, when to drain, and when to spin. F35 appears when the signal falls outside the range the control expects, which the control reads as an analog pressure sensor fault. In short, the control cannot tell how much water is in the tub, and it stops rather than guess. Three situations produce the same code. The reading can be corrupted, because suds fill the hose with foam instead of air, or because the hose is blocked, kinked, or detached. The switch itself can fail, sticking at one reading or drifting so its signal never matches the real level. Or the switch and hose can be healthy while the control board misreads a good signal, the rarest and costliest outcome. One early observation separates a real overfill from a sensor fault: water sitting more than halfway up the door glass means the tub really is overfull, and the taps should be closed at once. A normal or low level with F35 points at the sensor circuit.

Finding the cause

Excess suds are confusing the pressure reading

Suds are the first check because they are free to fix and they explain a large share of F35 faults that appear alongside the Sd or SUD code. Duet washers are built for HE detergent in small doses, and they use very little water, so a normal dose of non-HE detergent, or an oversized dose of HE detergent, fills the tub with foam. Foam climbs the pressure hose, traps air unevenly, and pushes the level signal out of range, so the control reports F35 even though the switch and hose are healthy. The clue is visible: thick foam in the tub, suds spilling toward the door seal, or an F35 that appears partway through a cycle after a detergent change. Run empty rinse and spin cycles with no detergent at all until the tub water runs clear, and check whether F35 stays away on the next normal wash with the correct HE dose. If it does, the detergent was the story, and the fix is a habit change, not a part. If F35 returns with a clean, foam-free tub, the fault is in the sensor circuit itself, and the next checks apply.

A one-off control glitch is holding the code

Like every electronic fault code, F35 can occasionally be a glitch: a voltage dip, an interrupted cycle, or a control that latched a bad reading and never rechecked it. The reset test costs ten minutes and settles the question. Unplug the washer, or switch its breaker off, wait at least 1 minute, restore power, and start a short cycle with an empty tub. Watch whether F35 returns at the same point, such as during the first fill, or whether the machine completes the cycle normally. A code that clears and stays cleared was a glitch, and no part needs replacing. A code that returns at the same stage, cycle after cycle, is a real fault in the sensor circuit, and the hose and switch checks below decide which part. Do not keep resetting a machine that is genuinely overfilling: if the tub water is visibly high, close the taps and call a service instead of running more cycles.

The pressure hose is blocked, kinked, or detached

The pressure hose is a thin rubber tube, and it is the most fragile link in the level sensing chain. Detergent residue and scale can narrow it, a hose can kink where it bends under the top panel, and it can work loose from the switch or from the tub fitting after vibration or a move. Any of these changes the air pressure reaching the switch, so the control receives a level signal that does not match the water in the tub. Checking the hose means opening the machine, so this is an advanced homeowner check: unplug the washer first, remove the top panel screws from the back, and slide the top panel back and off. The pressure switch sits on the right side wall under the top panel, a round component with a wiring connector and the small rubber hose attached. Look for a hose that has come off its fitting, a sharp kink, or visible residue at either end. A hose that is detached can be refitted firmly; a blocked hose can be removed and blown through gently from the switch end to clear it, and a healthy switch clicks as the pressure changes. If you are not comfortable working inside the machine with the power disconnected, leave this check to a service: the diagnosis is the same either way, and a careful technician will start here too. Refit everything, restore power, and retest. If F35 clears, the hose was the story.

The drain pump filter is clogged and the tub cannot empty properly

A clogged pump filter does not directly trip F35, but it muddies the diagnosis, because a tub that cannot drain properly also cannot produce a clean level reading on the next fill. If F35 appears alongside slow draining, standing water, or an F21 long drain code, clean the pump filter trap first. It sits behind the lower front panel on most Duet models: unplug the machine, place a shallow pan and towels ready, remove the lower front panel, and unscrew the filter trap slowly, letting the trapped water out in stages. Clear lint, coins, hairpins, and residue, refit the trap firmly, and run a drain and spin cycle. A filter that was packed solid explains drain symptoms and removes one variable from the F35 diagnosis. If F35 persists with a clean filter and a tub that drains normally, the fault is in the pressure circuit, not the drain.

The pressure switch itself has failed

When suds are cleared, a reset fails, and the hose is firmly attached and clear, the pressure switch becomes the leading suspect. The switch can fail in two ways: it can stick, reporting the same level regardless of the water in the tub, or its internal contacts can drift, so the signal it sends is plausible but wrong. There is no reliable homeowner test that separates a failed switch from a failing control board, because both produce the same symptom and the switch cannot be bench tested with certainty from outside the machine. That uncertainty is exactly why the switch is replaced before the board: it is far cheaper, it fails more often, and a technician can confirm the diagnosis by fitting a known good switch and watching the level reading return to normal. A switch replacement is a service job for most owners, since it involves the top panel and the wiring connector, and the part must match the exact model: Duet pressure switches look alike across model years while their calibration differs. If a new switch clears F35, the diagnosis is confirmed and the repair is complete.

The main control board is misreading a good sensor signal

The control board is the last suspect, and it earns suspicion only by elimination. When the hose is proven clear and attached, the switch has been replaced with the correct part, suds are gone, and F35 still returns, the board is likely misreading the sensor signal or failing to act on it. Board faults on Duet machines are genuinely less common than switch faults for F35, and a board is expensive enough that guessing at it wastes serious money. This is also the point where a professional diagnosis pays for itself: a technician can test the sensor signal at the board connector and confirm whether a good signal is arriving and being misread, rather than swapping parts in order of price. If the board is confirmed, replacement ends the fault, but if the board is replaced on a guess while the real fault is a hose that was never checked, the code returns and the money is gone. Do not order a board until the checks above have all been done and documented for the technician.

Fixing it

1. Check the water level and the suds, about 5 minutes. Look through the door glass. If water is more than halfway up the door, close the taps and call a service. If the tub is foamy, run empty rinse cycles until the water runs clear.
2. Reset the control, about 10 minutes. Unplug the washer or switch its breaker off for at least 1 minute, restore power, and run a short empty cycle. If F35 stays away, it was a glitch.
3. Clean the pump filter trap, about 20 minutes. Unplug the machine, place a pan and towels ready, remove the lower front panel, unscrew the trap slowly, clear it, refit it firmly, and run drain and spin.
4. Check the pressure hose, about 30 minutes, only if you are comfortable inside the machine. With the machine unplugged, remove the top panel, find the pressure switch on the right side wall, and check the hose is firmly attached, unkinked, and clear. Refit or clear it, reassemble, and retest.
5. Replace the pressure switch, service visit. If the hose is good and F35 persists, have a service fit the correct model pressure switch and confirm the code clears on a full cycle.
6. Retest with a normal load, about 60 minutes. Run a full normal cycle with a normal HE dose and check that the fill, wash, drain, and spin all complete with no F35 and no standing water left behind.

What it costs

Suds and hose checks first; switch second; board last, and only on a diagnosis. Most F35 cases end at the free checks or the switch. A board is the expensive outcome that should never be guessed at.

All prices on this page are estimates based on typical US parts and service pricing. Your model, region and the actual failed part will move the real figure.

Repair or replace note: a hose or switch repair is almost always worth doing, since the fitted cost is a small fraction of a replacement washer. A board repair on an older Duet needs a harder look: if the board plus labour passes half the cost of a comparable new washer, or if the pump, door lock, and board all need work at once, replacement becomes the sensible choice. Drain problems are covered by the Whirlpool washer F21 guide, door lock faults by the Whirlpool washer F22 guide, and the full list is on the Whirlpool washer hub.

Mistakes that make it worse

• Replacing the control board before checking the hose and switch. The hose and switch fail more often and cost far less, and a board fitted on a guess does not fix either of them.
• Using non-HE detergent or overdosing HE detergent. Excess suds trip F35 on a healthy machine, and every suds fault that is misread as a part failure wastes a visit.
• Keeping running cycles on a genuinely overfull tub. If water is more than halfway up the door, close the taps. More cycles only risk a flood and a damaged floor.
• Forcing the top panel or the pressure hose fittings. Cracked fittings and torn hoses turn a refit into a parts order. Work with the machine unplugged and stop if a fitting resists.
• Ordering a pressure switch for the wrong model. Check the model plate first: Duet switches look alike across model years while their calibration differs.
• Clearing the display and calling it fixed. Pause and Cancel twice clears the code from the display, but a sensor fault returns on the next fill until the cause is fixed.

Frequently Asked Questions

Related Guides

• Whirlpool Washer Error Code F21: What It Means and How to Fix It
• Whirlpool Washer Error Code F22: What It Means and How to Fix It
• Whirlpool Washer Sd Error Code: What It Means and How to Fix It

More From the Whirlpool Washer Error Codes Hub

Back to the full list: Whirlpool Washer Error Codes