HVAC Code Lookup

Payne Furnace Code 24

Hard lockoutShown as: 2 short flashes, 4 long flashes

The 24 V secondary voltage fuse on the control board is open, which means there is a short in the low-voltage wiring.

Manual wording: “24 SECONDARY VOLTAGE FUSE IS OPEN - Check for: - Short circuit in secondary voltage (24V) wiring including thermostat leads.”

Documented for: PG92ESA, PG95ESA, PG96VTA, PG80MSU

Likely causes, most common first

  1. Short circuit in the secondary voltage (24 V) wiring, including the thermostat leads

When to call a technician

Just replacing the fuse blows the new one. A technician has to isolate the shorted thermostat or accessory wire first.

A Payne furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Other Payne codes