Ameristar Package Unit Re: Lockout Codes Code Description On Power to control Slow Flash Normal, Call for heat 2 Failed to detect or sustain flame (1Hr Retry) 3 Pressure Switch or Inducer Motor Problem 4 High Limit or Auxiliary Limit Open 5...

Ameristar Package Unit: M4PG4 Re: Flashing Code 4 Code 4 = Main Limit switch or Aux Limit (not a Roll-Out Limit) has opened its normally closed contacts. The control will operate the supply air blower and inducer while the open limit condition exists. ► The manual-reset Aux Limit is located...