GE GDT550PYRFS 24 in Top Control with Sanitize Cycle C1 Error Fix: Service Code — Fill Valve Stuck Open

Error code C1 on the GE GDT550PYRFS 24 in Top Control with Sanitize Cycle means: Service Code — Fill Valve Stuck Open. In GE dishwasher service/diagnostic mode (accessed via specific button press sequence), C1 indicates the fill valve is stuck in the open position — water continues to enter the tub beyond the proper level; the water inlet valve solenoid may have a mechanical failure or the control board relay driving the valve is stuck; this is a technician-level code not normally visible to users

The most successful fix is "Replace the Water Inlet Valve Assembly" (hard difficulty, ~60 minutes). Estimated DIY cost: $5-$15. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Replace the Water Inlet Valve Assembly") is rated hard difficulty and takes about 60 minutes. Tools needed: Adjustable wrench, Nut driver set, Multimeter, Flashlight.

DIY cost: $5-$15. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The GE GDT550PYRFS 24 in Top Control with Sanitize Cycle has 8 other known error codes, including: BEEP-1 (Single Beep + Flash — Water Fill Issue), BEEP-2 (Two Beeps — Door Not Latched), BEEP-3 (Three Beeps — Water Temperature Issue), BLINK-1 (Start/Reset Light Flashing — Cycle Interrupted), BLINK-7 (Start Light Blinks Seven Times — Heating Element Fault), and 3 more.

Error code C1 also appears on 8 other GE models: GDF535PGRSS 24 in Front Control with Steam Prewash, GDF630PSMSS 24 in Front Control Dishwasher, GDF645SSNSS 24 in Front Control with Steam & Sanitize, GDP630PYRFS 24 in Front Control Built-In Dishwasher 50 dBA Stainless Steel, GDP670SYVFS 24 in Top Control Smart with Dry Boost, GDT226SSLSS 24 in Built-In Dishwasher with Piranha Disposal, and 2 more. The fix may vary by model, so check each model's specific page for tailored repair steps.