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Error code · Water Heater

GE GeoSpring GEH50DFEJ Code F23: Micro A/D failure

F23 on 2014-2016 GE GeoSpring hybrid electric water heaters in the GEH50DEEJ, GEH50DFEJ, GEH80DEEJ and GEH80DFEJ series reports a micro A/D failure. The A/D converter inside the control's microprocessor turns sensor voltages, such as temperature readings,…

Medium · inspection needed
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Code
F23
Appliance
Water Heater
Brand
GE
Warranty
30-day workmanship

What F23 means

F23 on 2014-2016 GE GeoSpring hybrid electric water heaters in the GEH50DEEJ, GEH50DFEJ, GEH80DEEJ and GEH80DFEJ series reports a micro A/D failure. The A/D converter inside the control's microprocessor turns sensor voltages, such as temperature readings, into numbers the control can use. When that conversion fails, the control cannot trust its sensor inputs and shows F23. You may see odd temperatures or reduced heat pump operation, and the issue is inside the electronics.

Common causes of F23

  • Whether F23 returns after a clean power cycle
  • Stable supply voltage to the control
  • The control board's converter circuit
  • Sensor wiring that could disturb readings
✓ One safe check you can try

1. Confirm the tank is full, then turn the breaker off and on once. 2. Note whether F23 comes back immediately or after hours. 3. Check that nothing damp is near the control panel. 4. Contact us if it returns.

! Why to stop there
  • The converter sits inside the board, so a board problem is likely, but unstable supply can also disturb it.
  • We check supply and wiring first so a board is not replaced needlessly.
  • Stable power is confirmed before any converter-related conclusion about the board.
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

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 Water Heater FailureGE GeoSpring GEH50DNSRSA Message "Water Heater Failure": Electric side problem System FailureGE GeoSpring GEH50DXSRGA Message "System Failure": Immediate attention Wiring to unit incorrectGE GeoSpring GEH50DNSRSA Message "Wiring to unit incorrect. Must be 240V not 120V": Supply check EPGE GeoSpring GEH50DXSRGA Code EP: Energy price signal
F23F23 questions
What does A/D mean?

It stands for analog to digital. The control uses it to turn sensor voltages into numbers, so when it fails, the control cannot interpret temperatures correctly and shows F23.

Will the water heater overheat?

The code does not say that. It says the control cannot read its inputs reliably. We treat it as a priority because a control without reliable readings should not be left running for long.

Is F23 repairable?

In most cases the control is replaced rather than repaired at board level. We confirm the cause first, check the supply, and quote the work in writing before anything is ordered.

Book a visit

Still seeing F23?

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

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