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Error code reference

Samsung Air Conditioner Error Code E185

Power input error into indoor unit communication line

Samsung codesSamsung air conditioner codes
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What the E185 error code actually means

This error means your air conditioner detected dangerously high electrical voltage on a set of wires that should only carry low-level communication signals between the indoor and outdoor units. It is most likely the result of incorrect wiring, where a high-voltage wire was connected to the wrong terminal during installation or a recent service visit. This is a serious electrical fault and should be inspected and corrected by a qualified technician before operating the unit.

Diagnostic procedure

The full E185 procedure

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1
First diagnostic step
Check for disconnected line after turning off main power; reconfirm indoor unit comm line connection.
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Most common causes of E185

Ranked by how often they cause this code
  1. 1Miswired installation or service wiring
  2. 2Swapped conductors in conduit or junction box
  3. 3Damaged wire insulation causing contact with communication line
  4. 4Failed or damaged communication terminal block
  5. 5Incorrect wiring after indoor control board replacement

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Questions people ask about E185

What does E185 mean on a Samsung air conditioner?
E185 indicates that 220V AC voltage has been detected on the indoor unit's F1/F2 communication terminal block, which is designed only for low-voltage communication signals. This is a wiring fault that prevents the unit from operating safely. The error is triggered to protect the communication circuitry from damage caused by the incorrect voltage. The root cause is almost always miswiring at the terminal block or along the communication line.
Is the E185 error on a Samsung air conditioner dangerous?
Yes, this error represents a serious electrical safety concern. Line voltage present on communication terminals can damage the indoor control board, create a fire risk, and pose a shock hazard to anyone handling the wiring. Do not attempt to operate the unit while this fault is active. Shut off power at the main breaker and have the wiring inspected before resuming use.
How much does it cost to repair an E185 error on a Samsung air conditioner?
If the fix involves only correcting a wiring error with no damaged components, the cost is primarily a service call fee, typically in the range of $75 to $150 depending on location. If the communication terminal block or indoor control board was damaged by the voltage exposure, parts and labor can bring the total to between $200 and $600 or more. Getting a diagnostic assessment from a technician before authorizing parts replacement is advisable.
Can I fix the E185 error myself?
Resolving E185 requires identifying and correcting a high-voltage wiring error, which involves working near or with 220V conductors. Always shut off main power at the breaker before inspecting any wiring. If you are comfortable reading wiring diagrams and verifying conductor terminations, you may be able to identify the miswiring yourself, but the actual correction should be performed by a licensed HVAC or electrical technician given the shock hazard involved.
Will resetting the unit clear the E185 error?
Resetting the unit will not clear E185 if the underlying wiring fault has not been corrected. The error will return immediately upon restart because the 220V voltage will still be present on the F1/F2 terminals. The fault must be resolved by correcting the miswiring and confirming proper connections before the error code will clear.

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