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Error code reference
Sanyo Air Conditioner Error Code H4
System overload protection-abnormal ambient temperature or heat exchanger blocked.
SourceSanyo DLC4/DLF4 R-410A Ductless Split System - Service Manualp. 48, 49, 51, 54
Diagnostic procedure
The full H4 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
Verify ambient temperature is within range, clean heat exchanger.
SourceSanyo DLC4/DLF4 R-410A Ductless Split System - Service Manualp. 48, 49, 51, 54
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
2 manuals in the MyPros+ library document this code for Sanyo air conditioner.
Models covered by the manuals that document this code
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