42
Keeprite
Inducer or Blower Fault (Communication or Relay Error)
Furnace LED shows code 42; inducer or blower may not respond correctly.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Stuck inducer relay on control board, Failed ECM inducer (if equipped), Loose wiring to inducer, Control board failure
How to Fix / Troubleshooting
Safety: Turn off power and gas before inspecting components.
Steps:
- Check inducer wiring: Verify that the inducer motor leads are firmly connected and not burnt.
- Observe operation: On a call for heat, see if the inducer starts when commanded. If not, measure voltage at the inducer terminals. No voltage indicates a board or relay issue.
- Listen for relay click: If the control board relay clicks but inducer does not start with proper voltage, the inducer is likely failed.
Because this involves line voltage and safety controls, have a technician confirm and replace the inducer or control board as needed.
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Repair Difficulty
Hard
4/5
Required Part
Inducer Motor Assembly
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