Fisher & Paykel ActiveSmart Refrigerator Code 20: Flapper Heater Current Low

What Code 20 means

On original E-series ActiveSmart refrigerators such as the E522BRXFDU, Code 20 means the flapper heater current is low. The flapper is the air door between compartments, and its heater keeps it from freezing shut. A low reading means the heater is open or its Molex connection has come loose. The LCD or beep pattern shows the code. The air door may stick closed with ice.

Common causes of Code 20

Molex connection to the flapper heater loose
Flapper heater element open
Broken heater wire

✓ One safe check you can try

1. Unplug the unit for five minutes and restart. 2. Look for frost at the vent between compartments without scraping. 3. Keep doors closed. 4. If Code 20 returns, call us. Avoid scraping at the vents. Make a note of how many hours the code has been showing, since that helps us decide how urgent the visit is.

! Why to stop there

The flapper and its heater are inside the air duct and not reachable without panels.
A frozen flapper can stop airflow and warm the cabinet.
We check the Molex plug and heater resistance, then quote in writing.

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 Refrigerator codes

Code 20Code 20 questions

What is the flapper?

It is a small air door that opens and closes to meter cold air between sections. Its heater keeps ice off it. A frozen flapper can stop air from moving between compartments.

What is checked?

First the Molex connections, then the heater resistance. An open heater is replaced. Molex is the brand name of the plug that joins the heater to the board.

Could ice jam it?

Yes. If the heater is open the flapper can freeze, so we address Code 20 soon. Our work carries a 30-day workmanship warranty. Parts are ordered after you approve the written price.