4-6 Moderate Moderate DIY

Chamberlain Garage Door Opener 4-6 — Logic board / interrupter fault

Chamberlain Garage Door Opener · Error code 4-6

What 4-6 Means

Logic board reports an internal fault, typically related to the RPM/interrupter circuit. Sometimes resolved by a power-cycle and re-learn; persistent fault needs board replacement.

Symptoms

  • 4 flashes then 6 flashes
  • Opener will not respond consistently
  • Random shutdowns

Common Causes

1
Transient fault on logic board

Cleared by power cycle.

2
Failed logic board

Power-up self-test fails.

How to Fix It

  1. Unplug the opener for 60 seconds and plug back in.
  2. Re-learn travel and force.
  3. If 4-6 returns, replace the logic board (model-specific part).

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement Chamberlain logic board View on Amazon→

More Chamberlain Garage Door Opener Codes

1-1 1-1 — Low voltage / wall control wire issue 1-2 1-2 — Wall control / safety wire shorted 1-3 1-3 — Door control wire issue / lock button stuck 1-4 1-4 — Safety sensors misaligned or obstructed 1-5 1-5 — Safety sensor wires reversed or shorted 1-6 1-6 — Safety sensor obstruction or wire fault

All Chamberlain codes → All garage door opener codes →

Verified against manufacturer documentation: chamberlain.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.