Trane UPPER LAMP 3-TIME BLINK error code

What it means

Trane's troubleshooting table lists this pattern as indoor fan motor trouble. The service manual says the fan rotation feedback is not emitted during indoor fan operation.

Urgency

Likely causes

1. The indoor fan rotation feedback signal is not reaching the control board
2. Foreign material is interfering with the line-flow fan
3. The indoor fan motor, motor connector, or indoor board circuit needs service

Homeowner fix

Turn the unit off if the indoor fan is not moving or is noisy. You can check from outside that nothing is blocking the air inlet or outlet, but do not put anything into the unit.

When to call a pro

Call a licensed HVAC technician if the 3-time blink returns or the fan does not run normally. Tell them Trane identifies this as indoor fan motor feedback trouble.

Repair vs replace

Fan motor or control repairs are common. Compare repair with replacement only if the system is old and the quoted repair includes both motor and board replacement.

• Trane ML Series 9,000 BTU R-410A 115V (NTXWMT09A111AA / NTXSMT09A111AA)

  ML Series R-410A

• Trane ML Series 12,000 BTU R-410A 115V (NTXWMT12A111AA / NTXSMT12A111AA)

  ML Series R-410A

For your technician

Technician note: follow Trane's indoor fan motor check; inspect line-flow fan obstruction, motor connector, rotational feedback signal, indoor PCB, and fan motor. Page context: Trane maps this display to the ML Series R-410A line; source: Trane MyLinkDrive NTXWMT-A111A(B) Service Manual, Section 9 Troubleshooting; display convention: match the letter U, letter P, letter P, letter E, letter R, letter L, letter A, letter M, letter P, three, letter T, letter I, letter M, letter E, letter B, letter L, letter I, letter N, and letter K marker exactly before comparing neighboring codes.

Which systems show it

ML Series R-410A

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Related codes

Source

Next step