Step-by-Step DIY Fix Guide
- SAFETY: Unplug the dishwasher before checking connections.
- Ensure the supply tap under the sink is fully open.
- Straighten the inlet hose.
- Clean the inlet mesh screen.
- Run a cycle and monitor fill time.
If it's still not filling correctly
- If normal household water flow looks good but the code returns, the inlet-valve or fill-sensing path becomes more likely.
- U1 persists after confirming supply tap is fully open and screen is clean
What This Error Means
The U1 fault code on your Fisher & Paykel DishDrawer means: The dishwasher took longer than expected to fill with water. U codes indicate user-fixable issues. U1 is a milder version of A1 — check the water supply connections.
The most common cause is: water supply tap partially open — restricting flow.
This fault is user-addressable. Call a technician if U1 persists after supply checks.
Most Likely Cause by Symptom
The Fisher & Paykel dishwasher may stop, pause, or refuse to complete the cycle normally.
Likely cause: Water supply tap partially open — restricting flow
Check first: SAFETY: Unplug the dishwasher before checking connections.
Common Causes
- Water supply tap partially open — restricting flow
- Inlet hose slightly kinked
- Inlet filter screen partially clogged
What Not to Do
- Do not ignore recurring U1 — slow fill eventually triggers F6
Model and Display Variation Notes
Model-family notes
- Fisher & Paykel dishwasher display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Common parts
- Inlet valve (~$30–$70) if valve flow is restricted (varies) - consult technician
Manual and model check
Check your exact model and manual before ordering any Fisher & Paykel dishwasher parts.
Suggestions in this section are organized to support the troubleshooting flow first. Any future affiliate relationships should be disclosed clearly.
When Not to Keep Troubleshooting
U1 persists after confirming supply tap is fully open and screen is clean
How to Prevent It Recurring
- Keep the supply tap fully open at all times — a partially closed tap causes slow-fill faults
Related Error Codes
A1
The dishwasher did not receive water within the expected time. A1 and A10 both indicate a water supply problem. Unlike F6, A codes are user-addressable — check the supply before calling a technician.
F6
The dishwasher did not receive enough water within the expected fill time. This is usually caused by a supply issue rather than a dishwasher fault.
Extra notes
- This page is based on Fisher & Paykel support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-09
Based on: Based on Fisher & Paykel support material and edited into consumer-safe guidance for the exact code family on this page.
View Fisher & Paykel North America Support
Model coverage note: Fisher & Paykel dishwasher code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.