Seeing **45E** on a Samsung refrigerator narrows the problem to **main pcb to refrigerator inverter communication error**. What you do next depends on whether the code is an issue, a normal status/test message, or a model-dependent interpretation. A display code is evidence from the control system, not a component test result. That distinction matters because a connector, supply condition, obstruction, or feedback signal can mimic a failed component. The recorded display form is **45E**. Search normalization stores it as **45E** while preserving the characters a homeowner actually sees.
Reviewed by Ethan Mercer · Last reviewed August 17, 2026
Written by
Ethan Mercer Appliance Repair Content SpecialistPublished August 17, 2026Updated August 22, 2026Technically reviewed August 17, 2026
Content status:
Verified
Error code45E
ApplianceRefrigerator
Quick answer
Main PCB to refrigerator inverter communication error.
Model compatibility: Samsung can reuse or reformat codes across series and model years, so 45E may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Seeing **45E** on a Samsung refrigerator narrows the problem to **main pcb to refrigerator inverter communication error**. What you do next depends on whether the code is an issue, a normal status/test message, or a model-dependent interpretation. A display code is evidence from the control system, not a component test result. That distinction matters because a connector, supply condition, obstruction, or feedback signal can mimic a failed component. The recorded display form is **45E**. Search normalization stores it as **45E** while preserving the characters a homeowner actually sees.
Signs
Symptoms you may notice
A symptom that fits 45E is that cooling or heat-pump performance may drop or stop.
The 45E display becomes more meaningful if the compressor can attempt to start, stop unexpectedly, or run without the expected result.
While 45E is active, the code can follow abnormal voltage, current, inverter, or motor feedback.
When the 45E condition is present, 45E appears and the refrigerator can show behavior related to main pcb to refrigerator inverter communication error.
The 45E display becomes more meaningful if cooling, airflow, ice-making, defrost, or temperature performance may become intermittent depending on the affected subsystem.
Why it happens
Possible causes
varies by model/region — cross-region baseline — Main PCB to refrigerator inverter communication error
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
Before requesting service for 45E, confirm household power is stable and the appliance has not just experienced an outage or surge.
The next non-invasive check is to verify only external airflow and temperature conditions described in the manual.
As an external check for 45E, do not open sealed refrigeration circuits or inverter/high-voltage sections.
A safe owner-level check is to photograph the code before resetting or unplugging the refrigerator.
The next non-invasive check is to verify doors, visible airflow/ice obstructions, water/ice-bin seating, or demo mode only when relevant.
To rule out an accessible cause, use the exact model manual because Samsung refrigerator codes vary by family.
Important safety warning. Protect food if temperatures are no longer safe. Do not open the sealed refrigeration system or energized inverter/compressor circuits. If resolving 45E would require energized internal access, that is the point to hand the diagnosis to a qualified technician.
Get help
When to request repair service
Compressor/inverter issues require qualified electrical and refrigeration-system diagnosis, especially when temperatures are unsafe or the code returns after a power reset. If 45E keeps returning, record the stage at which it reappears so the technician can test the main pcb to refrigerator inverter communication error path instead of replacing parts by guesswork.
Book your repair
Seeing this code on your Samsung appliance?
Book a specialist visit for a clear estimate and approval before any repair.
Main PCB to refrigerator inverter communication error.
One controlled restart is reasonable after correcting an obvious external issue. A recurring **45E** display should be treated as diagnostic evidence, not as a reason to keep rebooting the appliance.
That depends on the accompanying symptom. A code with no safety hazard may allow a short diagnostic check, but **45E** should not be ignored if performance is deteriorating or the display keeps returning.
The code alone is not enough to justify a part. **45E** should narrow testing to the affected function; the final cause still has to be verified on the exact model.
The same-looking code can be reused on another Samsung appliance family or reformatted by region/model year. Match the appliance type and exact model before applying a meaning. This page therefore keeps **Refrigerator 45E** separate from same-looking codes used by other Samsung appliance families.
References
Sources & references
Samsung Canada internal RF32FMQDBSR/AA service error-code pages (support-cacyber.samsung.com)
