A2L relay fault: heating stops and only the fan runs while the furnace is in mitigation mode. The fault is on the furnace control board.
Likely causes
- A2L relay fault on the furnace control board
Safe checks for Ear
- Write down Ear before cycling power. The chart lists a power cycle only with the relay check, not as a stand-alone fix
- Technicianinvestigate the A2L relay, cycle power, and replace the integrated control board if the fault remains
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician. Ear is a control-board relay fault in mitigation mode.
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Parts & tools for this fix
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Furnace control board and low-voltage fuse: guide
In this code: A2L relay fault on the furnace control board
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