Leak detected — water in the base pan has activated the float switch
The C4 error on the GE GDT635HSMSS indicates leak detected — water in the base pan has activated the float switch. This typically occurs due to dishwasher door seal worn or damaged allowing water to drip into the base. Most homeowners fix this in 20–30 min by following the steps below.
Safety Warning
This is a high-severity error. Unplug the appliance immediately and assess the situation before attempting any repair.
Common Causes of C4
- 1Dishwasher door seal worn or damaged allowing water to drip into the base
- 2Internal hose or pump connection leaking into the base tray
- 3Excessive detergent suds overflowing out of the tub
- 4Cracked spray arm causing water to spray toward the door edges
How to Fix C4
- 1
Step 1
Turn off the dishwasher immediately and disconnect it from power
- 2
Step 2
Turn off the water supply valve under the sink
- 3
Step 3
Open the dishwasher door and visually inspect the door seal all the way around for tears or gaps
- 4
Step 4
Check that the dishwasher is level — an unlevel unit can cause water to shift toward the door and drip out
- 5
Step 5
Inspect the base of the dishwasher with a flashlight by looking into the kick plate area for pooled water
- 6
Step 6
If door seal appears intact and unit is level, call a technician to inspect the internal hose connections and pump housing
Tools Needed
When to Call a Technician
Water continues to appear in the base tray after fixing visible issues — an internal hose or pump seal needs professional repair
Frequently Asked Questions
Common questions about GE C4 error
The C4 error on the GE GDT635HSMSS means the float switch in the base of the dishwasher has been activated by accumulated water. This means water is escaping from somewhere inside the dishwasher tub before reaching the drain. The float switch cuts off water inlet to prevent a floor flood. Finding and sealing the leak source is essential before restarting.
Yes. Using regular dish soap or too much dishwasher detergent creates excess suds that can overflow out around the door seal and drip into the base tray. This activates the float switch and triggers the C4 error. Always use automatic dishwasher detergent only, following the dosage recommendations on the package.
Was this guide helpful?
Help us improve our repair guides