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Error code · Water Heater

GE GeoSpring PF/PH Code F38: T6 Mixing Valve Outlet Sensor

F38 on GE Profile GeoSpring PF and PH series water heaters made in 2025 and later is a T6 sensor failure, the mixing valve outlet temperature sensor. It appears only on models with the integrated mixing…

Medium · inspection needed
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Code
F38
Appliance
Water Heater
Brand
GE
Warranty
30-day workmanship

What F38 means

F38 on GE Profile GeoSpring PF and PH series water heaters made in 2025 and later is a T6 sensor failure, the mixing valve outlet temperature sensor. It appears only on models with the integrated mixing valve. T6 tells the control how hot the blended water is as it leaves the valve. If that reading is lost, the valve cannot be controlled accurately. You may see water temperature that swings or does not match the setting.

Common causes of F38

  • T6 sensor and connector
  • Mixing valve wiring
  • Control board input for T6
✓ One safe check you can try

1. Note the code and confirm the model has a mixing valve on the outlet. 2. Check the temperature at a faucet carefully before using the water. 3. Do not remove the valve cover or touch its wiring. 4. Call us to test and replace the required sensor if it is bad.

! Why to stop there
  • We separate a bad sensor from a bad valve with testing.
  • The T7 sensor is checked at the same time.
  • A written price comes before the repair.
Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.
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Other Water Heater codes

F10GE GeoSpring First-Generation GEH50DEED Code F10: Top element problem F11GE GeoSpring First-Generation GEH50DEED Code F11: Tank must be filled bAd linE (F12)GE GeoSpring First-Generation GEH50DEED Code bAd linE (F12): Supply voltage low F13GE GeoSpring First-Generation GEH50DEED Code F13: Keypad key stuck Dirty Filter (F14)GE GeoSpring First-Generation GEH50DEED Code Dirty Filter (F14): Clean the filter F15GE GeoSpring First-Generation GEH50DEED Code F15: DataFlash memory error Attention! Tank not filled!GE GeoSpring GEH50DNSRSA Message "Attention! Tank not filled!": Fill before power Heat Pump FailureGE GeoSpring GEH50DXSRGA Message "Heat Pump Failure": Heat pump section problem
F38F38 questions
What is T6?

It is the temperature sensor at the outlet of the mixing valve. It lets the control hold the delivered water temperature steady while the valve blends hot and cold.

Is F38 linked to F39?

They are neighbors. F38 is the outlet sensor and F39 is the cold inlet sensor at the same valve. We check both on one visit so the repair is complete.

Could the water scald?

It may run off the setting when the control cannot read the valve outlet. Test the water with care before use and keep the faucet on the cooler side.

Book a visit

Still seeing F38?

A technician diagnoses it on site and gives you the price in writing before any work starts.

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