Blower current too high during pre-purge: the main blower is above the value the control expected, and the furnace goes to hard lockout.
Likely causes
- Loose wiring to or from the blower motor
- Line wires to the control and the main blower motor reversed at the control
Safe checks for EbU
- Write down EbU. This is the high-current blower fault, not EbL
- Technicianverify wiring connections to and from the motor are not loose
- Technicianverify the line wires to the control and the main blower motor are not reversed at the control
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician. Reversed line wiring at the control is not a homeowner check.
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Parts & tools for this fix
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Furnace blower (circulator) motor: guide
In this code: Loose wiring to or from the blower motor
This one is for a technician to test or replace, so we only explain it and do not link to buy it.