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Error code reference

GE Dishwasher Error Code F48

Turbidity sensor reading high (possible open on sensor).

GE codesGE dishwasher codes

Turbidity sensor reading high (possible open on sensor).

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What F48 means on a GE dishwasher

F48 on a GE dishwasher indicates the control board has detected a high signal from the turbidity sensor. The turbidity sensor measures water cloudiness to help the control board determine how soiled the water is, which in turn adjusts wash cycle parameters. A high reading from this sensor would normally suggest the sensor is detecting heavily contaminated water, but GE has designated this fault as unused in current dishwasher logic.

For homeowners, this means the F48 code is essentially a placeholder that GE's engineering team has flagged as inactive. The turbidity sensor is still physically present in the dishwasher, but the control board does not act on this specific fault condition in any meaningful way. Your dishwasher is not detecting a real operational problem that requires attention.

Because GE explicitly designates F48 as an ignored fault, no diagnostic steps are required and no repair action is needed. The code may appear in the fault log or display under certain conditions, but it does not reflect a failure that affects wash performance, water use, or the mechanical operation of the machine. You can continue using the dishwasher normally.

Source: manufacturer service documentation.

Common causes of F48

  1. 01

    Spurious turbidity sensor signal

    Wiring / connection

    The turbidity sensor may generate a momentary high reading due to electrical noise or minor contamination on the sensor lens. Because GE marks F48 as unused, this signal is logged but does not indicate a true fault requiring repair.

  2. 02

    Turbidity sensor lens fouled with grease or mineral deposits

    Wiring / connection

    Heavy buildup on the sensor's optical lens can cause it to report abnormally high turbidity readings. While this can trigger the F48 log entry, the code itself is inactive and the dishwasher will continue to function normally.

  3. 03

    Control board firmware logging unused fault code

    Wiring / connection

    Some GE control board firmware versions log F48 as part of internal diagnostics even when no actionable sensor fault exists. This is a software-level behavior and does not indicate a hardware failure.

See the test procedure for each cause

Frequently asked questions about F48

What does F48 mean on a GE dishwasher?
F48 indicates the control board registered a high signal from the turbidity sensor, which measures water cloudiness during a wash cycle. GE designates this specific code as unused, meaning the control board is programmed to ignore it. No repair or diagnostic action is required when F48 appears.
Can I still use my GE dishwasher with the F48 code showing?
Yes. GE explicitly marks F48 as an ignored fault, so the dishwasher's wash performance, water handling, and mechanical systems are not affected. You can run cycles as normal without risk. If you are also seeing other error codes alongside F48, address those separately, as F48 itself is not the concern.
How do I fix F48 on a GE dishwasher?
No fix is needed. GE's service documentation designates F48 as an unused fault code that should be ignored. If the code is bothering you, you can clear the fault log by running a diagnostic cycle or cutting power to the unit for one minute. If F48 keeps reappearing alongside other codes or wash performance has declined, have a technician check the turbidity sensor and wiring as a secondary investigation.
How much does it cost to repair GE dishwasher error code F48?
Because F48 is an unused code that GE instructs technicians to ignore, there is no repair cost associated with it. No parts or labor are needed. If a service technician tells you a turbidity sensor replacement is required specifically for F48, get a second opinion, since the manufacturer's own guidance says this code requires no action.
Why does my GE dishwasher keep showing F48 after I clear it?
F48 may reappear because the turbidity sensor is intermittently generating high readings that the control board logs even though it does not act on them. This can happen due to mineral or grease deposits on the sensor lens. Cleaning the dishwasher interior with a citric acid or dishwasher-safe descaler product may reduce how often the reading spikes. Since F48 is an inactive fault, repeated appearances do not indicate worsening damage.

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