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Haas alarm

157 Motor Interface PCB Watchdog

The motor interface board stopped answering the control.

Stops the machineHaas Classic and NGC controls (mills and lathes)

What it means

The motor interface board stopped answering the control. The machine shut down to stay safe.

Common causes

  • Electrical noise or a loose cable between boards
  • Low or noisy power
  • Failing board

What to check first

  1. Power the machine off and on
  2. Write down how often it happens and what was running

Lock out the machine before reaching into it. Never bypass a door switch or interlock to clear an alarm.

When to call a repair tech

If it returns, a Haas tech should check the board, cables and power.

Repair companies that work on Haas

See all Haas repair

Quick answers

What does Haas alarm 157 mean?

The motor interface board stopped answering the control. The machine shut down to stay safe.

What causes Haas alarm 157?

Electrical noise or a loose cable between boards. Low or noisy power. Failing board.

How do I fix Haas alarm 157?

Power the machine off and on. Write down how often it happens and what was running. If it returns, a Haas tech should check the board, cables and power.

Alarm numbers and text can differ by control model, software version and machine builder. This page is a starting point from people who have worked on these machines, not a replacement for your machine builder's manual.

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