Frigidaire Dishwasher I40 Error Code: Water Supply Fault

Quick Answer

I40 on a Frigidaire dishwasher is a water fill fault. Like all fill-related codes across brands, the fix almost always starts with the simplest check: is the supply valve under the sink fully open? After that, check for a kinked inlet hose.

Most I40 calls I go on, the fix is embarrassingly simple. Somebody did plumbing work under the sink and bumped the supply valve, or the machine got pushed back and kinked the hose. But ignore it and the control board locks out completely. It also stops the heater from running dry, which can melt the element. Don't let a clogged $12 valve screen turn into a $200 repair.

FrigidaireDishwasherSeverity: moderate86% DIY Success

Time to Fix

20–55 min

Difficulty

beginner

Parts Cost

$22 – $38

Tools Needed

Phillips #2 screwdriver, Flathead screwdriver

What Does the I40 Code Mean?

OK so here's the deal. Your dishwasher gave the inlet valve a set amount of time to fill the tub, and it didn't happen fast enough. Frigidaire's timing window is honestly pretty tight. Low house pressure, a half-closed shutoff, a clogged screen, any of those can trigger it. I fixed three of these last month and two were literally just a kinked hose behind the machine. Start stupid-simple before you order any parts.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Water supply valve under sink partially or fully closed40%

Inlet hose kinked at rear of unit24%

Inlet valve solenoid winding failure14%

Low household water pressure12%

Inlet valve screen clogged with mineral scale10%

Symptoms You May Notice

I40 flashes right at the start of the cycle, usually within the first 2-3 minutes before you hear any spray sounds.
Tub is bone dry when you open the door, or maybe has half an inch of standing water sitting in the very bottom.
You can hear the valve click open but the normal rush of water never really gets going, just a weak trickle sound.
Cycle stops and won't restart no matter how many times you hit Start.
Sometimes a secondary heating fault shows up because the element ran hot with no water around it.

Can you reset a Frigidaire dishwasher to clear the I40 code?

Once you've fixed the supply issue, press and hold the Cancel button for 3 seconds until the display changes. If the code feels stuck, do a hard reset at the breaker for 60 seconds. When you restore power, run a Quick Wash cycle and stay there for the first 2-3 minutes to make sure you can actually hear water filling the tub before you walk away.

Tools Required for Diagnosis

Phillips #2 screwdriverFlathead screwdriverAdjustable wrenchMultimeter (Ohms setting)Bucket or old towelOld toothbrushWhite vinegar

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

ComponentComponent Under Test

Expected Range500–1500 ohms

ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Water Inlet Valve807046701 · $22–$38	807046701	$22 – $38

Frequently Asked Questions

Is I40 the same as I20 on Frigidaire dishwashers?

Think of I20 and I40 as two sides of the same coin. I20 is the exit problem where the pump can't get rid of dirty water, and I40 is the entrance problem where clean water can't get in. If you're seeing both codes intermittently, you might have a failing pressure sensor or a logic glitch in the main board. But usually I40 is strictly about the inlet valve or the house supply line. They don't share parts, so you're diagnosing two completely different systems.

Can hard water cause Frigidaire I40?

Absolutely. The inlet valve has a tiny fine-mesh screen designed to catch sediment before it ruins the internal seals. In areas with hard water or old galvanized pipes, that screen acts like a magnet for calcium and rust flakes. You can try cleaning it with a toothbrush and some vinegar, but if the mesh is brittle or completely packed, replacing the entire valve assembly is the only reliable long-term fix. Part 807046701 is about $35 and it solves it for good.

How much does fixing I40 actually cost?

Honestly, most of the time it's free. Turning a valve or repositioning a hose costs nothing. Cleaning the screen is basically zero dollars. A new inlet valve (part 807046701) runs $25-45 online or $65-80 at a local appliance parts store. If you're paying a tech, add $80-120 for labor on top. Worst-case DIY total is maybe $50. The only time it gets really expensive is if the control board is also shot, but a straight I40 code almost never means that.

My brand new Frigidaire is showing I40. Is it defective?

This happens more than you'd think. First, check that the install crew fully opened the supply valve. Half of them are rushing and leave it cracked. Second, some new units have protective shipping plugs or tape in the inlet hose that didn't get removed during install. I've seen it twice on fresh-out-of-box machines. Third, if you're in new construction, house water pressure might still be getting balanced. Check those three things before you call for warranty service, because the warranty tech is going to check the exact same things.

Can I run the dishwasher with I40 showing?

No. Don't try it. The whole reason this code exists is to protect the heating element from running dry. If the tub doesn't have enough water and that element fires up, you can melt the element housing or warp the tub liner. Both of those repairs cost way more than fixing a fill issue. The board will usually prevent the cycle from finishing anyway, but don't try to trick it. Fix the water supply problem first. In most cases it takes 10 minutes.

Related Frigidaire Dishwasher Error Codes

Code: I30Frigidaire Dishwasher I30 Error Code: Leak Detected Code: I20Frigidaire Dishwasher I20 Error Code: Drain Fault Code: E20Frigidaire Dishwasher E20 Error Code: Pump Fault

Same Fix Works on These Brands

Frigidaire shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience I40 Errors

This repair applies to most Frigidaire dishwashers with this error code. Common model numbers include:

FFCD2413US, FFCD2418US, FGID2479SF, FGID2466QB, FFID2426TS, FDPC4221AS, FGID2474QF, FDSH4501AS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 14, 2026