Sub-Zero Classic BI Code 95-2-01: Freezer compressor signal stuck on

What 95-2-01 means

On Classic Built-In units with electronic control, for instance the BI-36UFD/S, 95-2-01 is a freezer diagnostics code. The micro-compressor pin for the freezer compressor is stuck in the on position. The board cannot trust that reading, and the freezer compressor may run constantly, leaving the freezer colder than set and the machine compartment warm, or the board may restrict operation to protect the system.

Common causes of 95-2-01

Freezer compressor drive reporting a stuck-on signal
Short in the diagnostic wiring
Board misreading the freezer compressor signal

✓ One safe check you can try

1. Note 95-2-01. 2. Check the freezer temperature with a thermometer. 3. Listen for whether the compressor ever cycles off during an hour. 4. Power-cycle the unit at the breaker, two minutes off. 5. Keep the grille clear and contact us if the code returns.

! Why to stop there

The compressor drive and diagnostic wiring are in the machine compartment beside high voltage.
Live testing confirms where the stuck signal comes from.
Ordering parts without testing risks paying for the wrong one.

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

41Sub-Zero 648PRO Code 41: Zone compressor or wiring problem 81Sub-Zero 700-2 Code 81: Variable-Speed compressor fails to start 82Sub-Zero 700-2 Code 82: VS compressor controller needs replacement 88Sub-Zero 700TF Code 88: Board and compressor controller not talking 80Sub-Zero 700TF Code 80: No inverter feedback after a board change ddSub-Zero 600 and 700 Series Display dd: Diagnostics switched off deSub-Zero 600 and 700 Series Display de: Diagnostics enabled 23Sub-Zero 600, 700 and 648PRO Code 23: Defrost overheat with no feedback

95-2-0195-2-01 questions

Is a freezer that is too cold a problem?

It means the compressor is running more than needed, which wears it and raises your power bill. 95-2-01 explains why: the freezer compressor's diagnostic signal is stuck on, so the board loses its normal control.

What is the difference from 95-2-00?

On a Classic BI, 95-2-00 means the freezer compressor signal is stuck off, while 95-2-01 means it is stuck on. One tends to warm the freezer, while the other tends to overcool it and keep the compressor busy.

How is it repaired?

We test the compressor drive, the diagnostic wiring and the board, then quote the repair in writing before anything is ordered. Our labor has a 30-day warranty.