Article ID: 316
Last updated: 4 Oct, 2024
York Air Handler: MP, MX, MV, AHP, AHX, AVY Re: Fan Runs Continuous, Flashing Code 4 Code 4 = Extended Limit Trip The control board in the air handler monitors the limit switch(es) in the aux heaters. If the limit switch opens for a long duration (fault code 4), the control will energize the blower until power is removed from the control. The control will continue to cycle the heat outputs on and off as the limit re-closes and opens. The constant fan operation will signal the homeowner that a problem has occurred and a service call is required. Two conditions that generate a Code 4:
Checkout: 1. Check for Water on Control Board
2. Check Limits & Board
3. Check Blower Operation
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Article ID: 316
Last updated: 4 Oct, 2024
Revision: 18
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Views: 2830
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