Fisher & Paykel ActiveSmart Refrigerator Code 4: All Sensors Reading Shorted

What Code 4 means

On original E-series ActiveSmart refrigerators like the E522BLXFDU, Code 4 is the mirror of Code 3: the resistance of all temperature sensors is outside the normal range, this time below 660 ohms. Since every sensor reads the same way at once, a shared connector or the power module is the suspect. Ice & Water models show it on the LCD. Cooling may run unevenly while it shows.

Common causes of Code 4

6-way connector at the power module damaged or bridged
Power module input circuit failing
Wiring harness pinched somewhere along the cabinet

✓ One safe check you can try

1. Turn the refrigerator off by unplugging it, wait five minutes, then restart. 2. Keep door openings short while you wait. 3. Check food in the freezer for softening. 4. If Code 4 comes back, call us rather than retrying. Avoid opening the doors more than necessary.

! Why to stop there

A low reading on every sensor at once cannot be fixed by swapping one sensor.
The connector and module are behind rear panels that should not be opened by owners.
We inspect the connection, then give a written price before ordering the module.

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 Refrigerator codes

Ice maker PCB LED: 2 flashesFisher & Paykel ActiveSmart Refrigerator Code Ice maker PCB LED: 2 flashes: Motor current high, motor obstructed Ice maker PCB LED: 3 flashesFisher & Paykel ActiveSmart Refrigerator Code Ice maker PCB LED: 3 flashes: Temperature sensor too hot Ice maker PCB LED: 4 flashesFisher & Paykel ActiveSmart Refrigerator Code Ice maker PCB LED: 4 flashes: Temperature sensor too cold or open Ice maker PCB LED: 5 flashesFisher & Paykel ActiveSmart Refrigerator Code Ice maker PCB LED: 5 flashes: Water solenoid current high Code 40Fisher & Paykel ActiveSmart Refrigerator Code 40: Ice Maker Solenoid Transistor 1 Short Code 41Fisher & Paykel ActiveSmart Refrigerator Code 41: Ice Maker Solenoid Transistor 2 Short Code 42Fisher & Paykel ActiveSmart Refrigerator Code 42: Fill Tube Heater Current High Code 43Fisher & Paykel ActiveSmart Refrigerator Code 43: Fill Tube Heater Open

Code 4Code 4 questions

How is Code 4 different from Code 3?

Code 3 means every sensor reads high, above 45K ohms. Code 4 means every sensor reads low, under 660 ohms. Both point to the shared connector or the power module.

Could one bad sensor cause it?

Not on its own. When a single sensor fails, you get a sensor-specific code such as 5 through 9. Code 4 covers all of them, so the problem sits upstream.

Should I keep using the fridge?

Short term, yes, if food stays cold. Check temperatures often, and call us if the code repeats so we can quote the repair in writing. Ask us anything about it when you call, and we will explain the repair.