Error code displayed on a Whirlpool refrigerator rarely comes out of nowhere — a specific part or condition is behind it, and pinning that down turns a guess into a real fix.
The short answer#
Most likely: common error codes and their meaning. The control board detected an AC power interruption and is alerting you that temperatures may have risen during the outage. This is informational only — not a malfunction. If that checks out, look next at po — power outage detected.
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Causes, ranked by likelihood#
Here is how the causes stack up, most common first:
| Likely cause | How common | What you'll notice / what to check |
|---|---|---|
| Common Error Codes and Their Meaning | Most common | The control board detected an AC power interruption and is alerting you that temperatures may have risen during… |
| PO — Power Outage Detected | Common | The control board detected an AC power interruption and is alerting you that temperatures may have risen during… |
| Error Code 01 — Defrost Bi-Metal Open | Fairly common | The defrost thermostat (bi-metal) has remained in the open position beyond the expected threshold. |
| Error Code 02 — Control Board Communication Failure | Occasional | The main control board cannot communicate with a secondary board or sensor. |
Working through it yourself#
Work these from most to least likely so you do not chase a rare fault first.
1. Common Error Codes and Their Meaning#
Behind the scenes, the control board detected an AC power interruption and is alerting you that temperatures may have risen during the outage. This is informational only — not a malfunction. How to clear: Press any button on the control panel. With the unit unplugged, inspect this part for visible wear or a loose connection and test it before replacing.
2. PO — Power Outage Detected#
The control board detected an AC power interruption and is alerting you that temperatures may have risen during the outage. This is informational only — not a malfunction. How to clear: Press any button on the control panel. Rule it in or out with a visual check and a continuity test where possible.
3. Error Code 01 — Defrost Bi-Metal Open#
In practice, the defrost thermostat (bi-metal) has remained in the open position beyond the expected threshold. The Adaptive Defrost control board initiated a defrost cycle but detected that the heater circuit did not conduct — either since the bi-metal thermostat is stuck fast open (most typical) or the heater itself is broken (open circuit in either component blocks current flow). Symptoms: Frost buildup on the evaporator coils (visible behind the freezer rear panel), progressively warming temperatures despite continuous compressor operation, possible evaporator fan noise from blade contacting ice. With the unit unplugged, inspect this part for visible wear or a loose connection and test it before replacing.
4. Error Code 02 — Control Board Communication Failure#
On models with separate UI (user interface) boards and main control boards, this indicates a wiring harness disconnection, a failed ribbon cable, or one of the two boards has a dead communication IC. Symptoms: Display may show erratic readings, temperature settings may not respond to button presses, or certain functions (ice maker, water dispenser) may stop responding while others work normally. The main control board cannot communicate with a secondary board or sensor. Reseat the board’s connectors and inspect for burned relays; board faults usually need a replacement, not a repair.
Safety First — Know the Risks
Refrigerant (R-134a/R-600a) requires EPA certification to handle. Improper discharge is a federal violation and health hazard. Our techs are licensed and insured — let them handle the risk.
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Error code quick reference#
Write down the exact code before you clear it — it is your fastest route to the failed subsystem.
| Code | What it means and what to do |
|---|---|
PO | Under the hood, the control board detected an AC power interruption and is alerting you that temperatures may have risen during the outage. This is informational only — not a malfunction. |
Error Code 01 | The defrost thermostat (bi-metal) has remained in the open position beyond the expected threshold. The Adaptive Defrost control board initiated a defrost cycle but detected that the heater circuit did not conduct — either as the bi-metal thermostat is jammed open (most frequent) or the heater itself is broken (open circuit in either component stops current flow). |
Error Code 02 | The main control board cannot communicate with a secondary board or sensor. On models with separate UI (user interface) boards and main control boards, this indicates a wiring harness disconnection, a failed ribbon cable, or one of the two boards has a dead communication IC. |
Recap before you start#
Boiled down, check these in sequence:
- Common Error Codes and Their Meaning — most common; rule it in or out with a visual check and a continuity test where possible.
- PO — Power Outage Detected — common; with the unit unplugged, inspect this part for visible wear or a loose connection and test it before replacing.
- Error Code 01 — Defrost Bi-Metal Open — fairly common; rule it in or out with a visual check and a continuity test where possible.
- Error Code 02 — Control Board Communication Failure — occasional; try a hard reset first — unplug for a minute — then look for scorched spots or swollen parts on the board.
The Real Cost of DIY
Average DIY attempt: $150-400 in tools you may use once, plus the risk of further damage. Our diagnostic visit costs $0 — we find the problem and give you an honest quote.
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What fixing it usually involves#
Once the cause is confirmed, the fix is usually straightforward for a tech — access the part, replace it, and test under a real cycle before closing up. Because common error codes and their meaning tops the list, that is often the first thing pulled and checked.
Keeping it from coming back#
Keeping up with the basics — clearing lint or debris, wiping seals, not overloading — heads off most repeat failures on a Whirlpool refrigerator.
Don't Void Your Warranty
Opening your appliance yourself may void the manufacturer warranty. Our repair comes with a 90-day guarantee, and we document everything for warranty compliance.
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When professional service makes sense#
Call a technician if the symptom persists after the checks above, if the repair means reaching power, gas, or sealed components, or if your Whirlpool refrigerator is still under warranty — DIY work can void it. Cost tracks the underlying part and the labor to reach it; an on-site diagnosis pins it down before you commit.
Rather not open it up yourself? Schedule an EasyBear visit for a grounded diagnosis and an up-front quote on your Whirlpool refrigerator.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
