Quick answer
A dishwasher high loop error usually indicates a problem with the water inlet valve or pressure switch. Check for clogs, ensure proper water supply, and test the pressure switch. If the issue persists, replace the faulty part.
Confirm the symptom
- Dishwasher displays 'High Loop' error code
- Dishes are not cleaning properly
- Water is not entering the dishwasher during the fill cycle
- Dishwasher makes a humming noise but doesn't fill with water
- Error code appears after a recent water supply issue
Tools and prep
- Screwdriver (flathead and Phillips)
- Multimeter for testing electrical components
- Plumber's tape
- Bucket for water collection
- Safety gloves and goggles
- Owner's manual for your dishwasher model
Step-by-step troubleshooting
- Turn Off Power and Water SupplyDo: Unplug the dishwasher or turn off the circuit breaker. Shut off the water supply valve under the sink or near the dishwasher.Observe: Dishwasher is completely powered down and water supply is off.Means: Safety precautions are in place to prevent electrical or water hazards.Next: Inspect water inlet valve
- Inspect Water Inlet ValveDo: Locate the water inlet valve at the back of the dishwasher. Check for visible clogs or damage. Use a screwdriver to remove the valve if necessary.Observe: Valve is either clogged, damaged, or functioning properly.Means: A clogged or damaged valve can prevent water from entering the dishwasher.Next: Clean or replace the valve if needed
- Clean or Replace the ValveDo: If the valve is clogged, clean it with a soft brush and water. If it's damaged, replace it with a new water inlet valve.Observe: Valve is clean or replaced with a new one.Means: A clean or new valve should allow water to flow into the dishwasher.Next: Test the dishwasher
- Test the DishwasherDo: Turn the water supply and power back on. Run a test cycle to see if the 'High Loop' error persists.Observe: Dishwasher fills with water and completes the cycle without error.Means: The issue is resolved if the error does not reappear.Next: Check pressure switch if error persists
- Check Pressure SwitchDo: Locate the pressure switch, usually near the bottom of the dishwasher. Use a multimeter to test for continuity.Observe: Multimeter shows continuity or no continuity.Means: No continuity indicates a faulty pressure switch.Next: Replace the pressure switch if faulty
- Replace the Pressure SwitchDo: Disconnect the wiring from the old pressure switch. Install the new switch and reconnect the wiring securely.Observe: New pressure switch is installed and functioning.Means: A new pressure switch should resolve the 'High Loop' error.Next: Final test and monitoring
- Final Test and MonitoringDo: Run another test cycle and monitor the dishwasher for any signs of the error or other issues.Observe: Dishwasher operates normally without the 'High Loop' error.Means: The problem is resolved if the dishwasher functions correctly.Next: Complete
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Water Inlet Valve Mineral deposits or debris can block water flow into the dishwasher. | Common | Easy | Water Inlet Valve |
| Faulty Pressure Switch A malfunctioning pressure switch may not detect proper water levels, causing the error. | Sometimes | Medium | Pressure Switch |
| Low Water Pressure Insufficient water pressure can prevent the dishwasher from filling properly. | Sometimes | Easy | None |
| Water Supply Valve Not Fully Open A partially closed valve restricts water flow to the dishwasher. | Sometimes | Easy | None |
| Faulty Water Inlet Valve A damaged or worn-out valve may not open to allow water into the dishwasher. | Sometimes | Medium | Water Inlet Valve |
| Blocked Drain Hose A clogged drain hose can cause water to back up and trigger the error. | Rare | Medium | Drain Hose |
| Malfunctioning Control Board A defective control board may misinterpret sensor readings and display the error. | Rare | Hard | Control Board |
| Incorrect Installation Improper installation of the dishwasher or its components can lead to operational issues. | Rare | Medium | None |
Parts matching
Common parts needed to fix a dishwasher high loop error include:
- Water Inlet Valve
- Pressure Switch
- Drain Hose
- Control Board (rarely needed)
Always refer to your dishwasher's owner's manual to ensure you're using the correct replacement parts for your model.
When to call a professional
- The 'High Loop' error persists after replacing the water inlet valve and pressure switch
- You are unsure about testing electrical components like the pressure switch
- The dishwasher still does not fill with water after checking all connections
- You notice water leaking from the dishwasher after repairs
- The control board is suspected to be faulty, as it requires advanced technical skills to replace
FAQ
What does the 'High Loop' error mean on a dishwasher?
The 'High Loop' error typically indicates a problem with the water inlet system, such as a clogged valve, low water pressure, or a faulty pressure switch.
Can I fix the 'High Loop' error myself?
Yes, many common causes of the 'High Loop' error can be resolved with basic tools and troubleshooting steps. However, if the issue involves the control board, it's best to call a professional.
How do I know if the water inlet valve is clogged?
If the dishwasher is not filling with water or makes a humming noise during the fill cycle, the water inlet valve may be clogged or faulty.
Is the pressure switch easy to replace?
Replacing the pressure switch is moderately difficult and requires some basic electrical knowledge. Always ensure the power is off before attempting this repair.
Why is my dishwasher still showing the 'High Loop' error after replacing the valve?
If the error persists after replacing the valve, the issue may be with the pressure switch or the control board. Test these components next.