E07
Alpha
Pressure Switch Stuck Closed
Furnace shows E07; inducer runs continuously without ignition sequence starting.
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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
Shorted pressure switch contacts, Pressure switch hose misrouted causing constant vacuum, Faulty Alpha control board sensing circuit, Inducer motor backdrafting through vent
How to Fix / Troubleshooting
Safety: Disconnect power before testing the pressure switch.
- Visual inspection: Locate the pressure switch and verify the hose is connected to the correct port on the inducer housing. Ensure it is not connected to a constant vacuum source.
- Check for stuck contacts: With power off, gently tap the pressure switch body with the handle of a screwdriver to free a stuck diaphragm. Do not hit hard.
- Inspect wiring: Confirm the two low-voltage wires on the pressure switch are firmly attached and not shorted together.
- Restart: Restore power and call for heat. If E07 returns immediately and the control board diagnostic LED indicates a stuck-closed switch, the pressure switch or control board may need replacement.
Because this involves safety interlocks, further diagnosis is best handled by an Alpha-certified technician.
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Repair Difficulty
Hard
4/5
Required Part
Alpha Draft Pressure Switch
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