Legacy Thermador Pro-Harmony Range E1 (Blue-Light Code 22): EEPROM Error

What E1 means

If an older Professional Series range (PDR30/36/48 or PRG30/36/48, the legacy Pro-Harmony gas and dual-fuel line) blinks the blue oven light twice and then the blue heating light twice, the control is reporting E1, an EEPROM error. That points to the control's stored memory, and the pattern repeats for as long as the condition lasts. Newer Thermador units use the same symbol differently.

Usual causes of E1

Control board memory (EEPROM) not reading correctly

✓ A safe check worth trying

1. Count the blue light flashes and write the pattern down. 2. Shut the oven off and wait a couple of minutes. 3. Restore power at the breaker, then try the oven once more. 4. If the two-then-two pattern comes back, stop using the oven and call us, because the control itself needs a technician.

! Why you should stop here

The memory lives on the control board, which owners cannot test safely.
Swapping boards by guesswork on a legacy range gets expensive quickly.
Confirming the diagnosis first lets us quote the work in writing before any part is ordered.

Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.

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More Range codes

E14Thermador Pro-Harmony Range with Five-and-Five Blue Lights: E14 Selector Switch Error F2 / E7015Thermador Induction Range Cooktop F2 / E7015: Electronics Overheated EThermador Range Display Reading "E" Plus a Number F1Thermador ESC30/GSC30 Range F1: Supervisory Relay Enable Shorted F4 / E7015Thermador Induction Range Cooktop F4 / E7015: Electronics Overheated, All Zones Off dEThermador Range "dE" on an Induction Cooktop (Demo Mode) F2Runaway Temperature Alarm F2 on a Legacy Thermador ESC30/GSC30 Range F5Thermador Induction Range Cooktop F5: Hot Cookware Near Control Panel

E1E1 questions

Does a power reset fix E1 on an older Pro-Harmony range?

It can clear a one-time glitch, so one reset is worth trying. If the two-then-two flash pattern returns, the control is still reporting a memory problem and a technician should examine it.

Can I still bake while the blue lights flash?

The service document does not call this error harmless, so we advise against relying on the oven. Turn it off at the control and have us look before you cook with it again.

How do I know my range is the legacy kind?

Look for a PDR or PRG prefix with a 30, 36 or 48 size on the rating plate. Send us the full number and we confirm the details on site.