E205HIGH
Pressure Switch Stuck Open
The pressure switch detects inadequate draft inducer vacuum and prevents the furnace from firing to ensure safe exhaust venting.
What This Error Code Means
The pressure switch isn't closing, indicating the draft inducer isn't creating proper negative pressure for safe exhaust.
Common Causes
- Blocked or frozen vent pipe
- Failed draft inducer motor
- Cracked or disconnected pressure switch hose
- Defective pressure switch
- Restricted combustion air intake
Affected Brands
LennoxCarrierTraneGoodmanRheemYorkBryant
How ROMA Heating Fixes This
- Inspect and clear vent and intake pipes
- Test draft inducer motor operation and amp draw
- Check pressure switch hoses for cracks or blockages
- Replace pressure switch if failed
- Verify proper switch closure after repair
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