Seeing **45C** 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. Samsung appliances monitor whether a function reaches an expected state within a certain sequence. When that check fails, the control can store or display a code even though the root cause may sit elsewhere in the same circuit. The recorded display form is **45C**. Search normalization stores it as **45C** 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 code45C
ApplianceRefrigerator
Quick answer
Main PCB to refrigerator inverter communication error.
Model compatibility: Samsung can reuse or reformat codes across series and model years, so 45C 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 **45C** 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. Samsung appliances monitor whether a function reaches an expected state within a certain sequence. When that check fails, the control can store or display a code even though the root cause may sit elsewhere in the same circuit. The recorded display form is **45C**. Search normalization stores it as **45C** while preserving the characters a homeowner actually sees.
Signs
Symptoms you may notice
The 45C display becomes more meaningful if cooling or heat-pump performance can drop or stop.
Depending on the exact model, the compressor can attempt to start, stop unexpectedly, or run without the expected result.
The 45C display becomes more meaningful if the code can follow abnormal voltage, current, inverter, or motor feedback.
45C can be accompanied by this pattern: 45C appears and the refrigerator may show behavior related to main pcb to refrigerator inverter communication error.
While 45C is active, cooling, airflow, ice-making, defrost, or temperature performance can 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.
The next non-invasive check is to confirm household power is stable and the appliance has not just experienced an outage or surge.
Before opening any service area, check only external airflow and temperature conditions described in the manual.
The next non-invasive check is to do not open sealed refrigeration circuits or inverter/high-voltage sections.
For 45C, start by doing this: photograph the code before resetting or unplugging the refrigerator.
As an external check for 45C, check doors, visible airflow/ice obstructions, water/ice-bin seating, or demo mode only when relevant.
As an external check for 45C, 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. Do not bypass a safety device merely to see whether 45C disappears.
Get help
When to request repair service
If the owner-accessible checks do not clear 45C, Compressor/inverter issues require qualified electrical and refrigeration-system diagnosis, especially when temperatures are unsafe or the code returns after a power reset. The repair should confirm the monitored function and its feedback before any board or component is condemned.
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.
A single documented power reset can help after an external condition or power event is corrected. If **45C** returns at the same stage, repeated resets only erase useful evidence and do not repair the cause.
Continue only if the appliance is otherwise safe and the owner-level checks are appropriate. Stop for leakage near electrical parts, smoke, burning odor, arcing, gas concerns, repeated breaker trips, uncontrolled heating, or unsafe temperatures.
The code alone is not enough to justify a part. **45C** 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 45C** 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)
