GE GDT665 Dishwasher — Problems & Repair Guide

The GDT665 is a quiet third-rack GE dishwasher with bottle jets and Dry Boost. Its issues are drainage, spray, and control-relay related. Here is the ranked data and repair guidance.

Covered models#

• GDT665SSNSS
• GDT665SYNFS
• GDT665SMNES

Spec at a glance#

Ranked failures#

1. Drain-pump check valve sticks — 16%. Water stands in the tub after the cycle ends because the valve does not seat. Cleaning the sump and filter clears many of these before a part is needed.
2. Bottle-wash jets clog with mineral deposits — 14%. Upper-rack cleaning weakens as scale blocks the micro-jets.
3. Float switch sticks — 10%. The dishwasher over- or under-fills because the switch no longer reads water level correctly.
4. Dry Boost heater relay on the control board fails — 10%. Dishes come out wet because no extra heat reaches the final rinse.
5. Door-latch micro-switch fails — 8%. Cycles will not start until the latch confirms closed.

Error codes and reset#

• Error C1 and Error C3 — sensor and control faults

For anything else, cut power for 60 seconds to clear a transient fault before diagnosing.

Fix or replace?#

Most GDT665 faults are small parts — a check valve, a float switch, a latch — so repair is the easy call while the machine is under about ten years old and the quote holds under half a new unit's price. A control-board relay failure is the pricier one; weigh that single repair against the dishwasher's age before deciding.

Keeping it running#

• Descale the bottle jets and spray arms periodically in hard-water areas.
• Clean the filter regularly to keep drainage strong and prevent the check valve from sticking.
• Run a monthly cleaner cycle to hold off mineral buildup.
• Confirm the door latches fully so cycles start reliably.

Related guides#

• GE dishwasher not drying
• GE dishwasher will not start
• GE dishwasher not cleaning properly

What to check before you book#

A surprising share of GDT665 calls are solved without a part. If water is standing in the tub, first pull the lower rack, lift out the filter, and clear the sump of glass grit and food debris — a partially blocked drain path mimics a stuck check valve. If the upper rack is not getting clean, remove the bottle-wash jets and the spray arms and soak them in warm vinegar to dissolve the mineral scale that throttles their micro-holes. When dishes come out wet, confirm you are using rinse aid and that Dry Boost is actually enabled for the cycle before assuming the heater relay has failed. And if the dishwasher will not start at all, press the door firmly until the latch clicks — a marginal latch micro-switch often just needs the door seated squarely. A drain filter cleaned every month or two also prevents most of the check-valve and standing-water complaints from ever starting. If none of that helps, note which of the ranked failures your symptom matches and book the visit; a technician can confirm the check valve, float switch, or control-board relay quickly, and having the model number ready lets them bring the exact part on the first trip.

Recall status#

No active recalls on the GDT665 series as of 2026-05-28. Confirm at cpsc.gov.

Book a GE GDT665 repair at /book — diagnosis and upfront pricing, common GE parts stocked.