GE GDP645SYN (GDP645SYNFS) stainless-tub dishwasher with Dry Boost and fan: quick sheet

Covers: GE 24-inch hidden top-control GDP645SYN** with pocket handle and stainless tall tub: GDP645SYNFS (fingerprint-resistant stainless) and finish variants. GDT645SYN** is the bar-handle sibling. Sold approx. 2019-2024 (inferred from listings; retailers mark it discontinued). Find the model/serial tag on the tub edge inside the door. Build-date reading from the serial is not stated here (not confirmed by two sources for this family); see the guide find-model-and-serial-number-on-any-appliance.

Single sourceBrands: GE10 components

Upper-mid GE built-in: stainless tall tub, 16 place settings, 48 dBA, five cycles, bottle jets, Piranha hard food disposer and Dry Boost with fan assist. GE dishwashers of this generation report by display or light pattern depending on model: H2O (no fill), C1/C3 (drain), C6/C7 (water temperature / thermistor), C8 (detergent cup), PF (power failure, not a fault). Meanings vary by model; see the GE dishwasher codes and the GE / GE Profile / Café dishwasher field service manual. Not yet verified: Second source for key specs was only a retailer listing title seen in search (page not fetched); size, cut-out and electrical single-source (Greentoe).

Safety first

Switch off the circuit (or unplug) and close the water supply before removing the kick plate or pulling the unit.
Hardwired units: open the junction box only with the breaker off and verified dead.
Water in the sump may be hot right after a cycle; the heating element stays hot for a while.
Live-voltage checks at the valve, pump, heater or board are caution work.
Watch for broken glass in the filter and sump.
Flood risk: keep towels down and confirm no leaks after reconnecting.

How it works

Tub and racks: stainless tall tub with two adjustable nylon racks (Greentoe lists no cutlery tray).

Pump and wash: inlet valve fills the sump; the wash pump drives the spray arms and the bottle jets in the upper rack. Soil sensor sets cycle length.

Filtration: Piranha hard food disposer ahead of a manual-clean filter.

Drying: heated dry with Dry Boost and a fan that moves moist air out.

Controls: hidden top controls with a status light, delay start and child lock.

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Clothes dryer with its vent duct in a small laundry closet by Introspectivedsgn, Pexels License

Diagnostic guides for this appliance

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