Error code · Water Heater

GE GeoSpring GEH50DFEJ Code bAd linE (F12): Low supply voltage

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Code: bAd linE (F12)
Appliance: Water Heater
Brand: GE
Warranty: 30-day workmanship

What bAd linE (F12) means

On 2014-2016 GE GeoSpring hybrid electric water heaters in the GEH50DEEJ, GEH50DFEJ, GEH80DEEJ and GEH80DFEJ series, bAd linE, also listed as F12, means the voltage was too low when the unit powered up. These water heaters are designed for a 240-volt feed, and the control checks it at start-up. Instead of normal operation you will see the bAd linE message on the display. It usually shows up on a new installation, after electrical work, or after a power event.

Common causes of bAd linE (F12)

Whether the unit is wired to a proper 240-volt two-pole breaker
Loose or undersized supply connections at the unit
Breaker condition and a possible weak or tripped pole
The control's voltage-sensing input

✓ One safe check you can try

1. Turn off power to the water heater at the breaker. 2. Read the Electrical Connections section of the owner's manual. 3. Have the installer or an electrician verify the 240-volt electrical input. 4. Do not open the unit's wiring compartment yourself.

! Why to stop there

Low voltage at power-up can come from the house wiring or from the unit, and only measuring tells which.
We verify the supply before touching the water heater itself.
If the supply measures correct, the heater's own voltage sensing becomes the next suspect.

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.

→Same appliance

Other Water Heater codes

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 Water Heater FailureGE GeoSpring GEH50DNSRSA Message "Water Heater Failure": Electric side problem

bAd linE (F12)bAd linE (F12) questions

Is bAd linE the same as F12?

Yes. The display may show the words bAd linE, while the code list shows F12. Both describe the same low-voltage condition detected when the water heater powers up, so they are handled the same way.

Could my breaker be the cause?

It can be. A two-pole breaker with one weak side may deliver less than 240 volts to the heater, so we check the supply at the unit before judging the heater itself or ordering any parts.

Is it dangerous to leave it on?

We recommend shutting it off at the breaker until the supply is verified, because incorrect wiring is a safety matter and the heater may not heat properly while the voltage is wrong.

Book a visit

Still seeing bAd linE (F12)?

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

(713) 547-5545