Skip to main content
Error code reference
Samsung Heat Pump Error Code E503
Refrigerant charging operation restriction at over 15°C outdoor temperature in heating mode.
SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVMBH020CA0XAG)p. 222
Diagnostic procedure
The full E503 procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check if indoor EVAP OUT sensor connector is separated from PCB; measure resistance between both terminals.
SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVXCMH036EA)p. 12-33
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock E503 procedure $9.95
Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.
Where this code is documented
6 manuals in the MyPros+ library document this code for Samsung heat pump.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax