Run capacitor
Common no-start and weak-compressor failure point. Match the microfarad and voltage rating.
Coleman Furnace E2 Error Code — What It Means
E2 on a Coleman furnace (manufactured by York/Johnson Controls under the Coleman brand) indicates a pressure switch fault. The induced draft motor ran but the pressure switch did not close within the timed window, so the board blocked the ignition sequence. This is a safety interlock: without confirmed draft, the board will not open the gas valve.
Common Causes
- Blocked flue or intake pipe — Ice, bird nests, or debris plugging the PVC vent cap prevents the inducer from pulling adequate draft to close the pressure switch.
- Cracked pressure switch hose — The small rubber hose between the inducer housing and the pressure switch is a common failure point. Even a hairline crack prevents the switch from sensing negative pressure.
- Weak induced draft motor — A motor or capacitor past its service life runs below rated speed, producing insufficient draft to close the switch even with a clear flue.
- Failed pressure switch — The switch diaphragm deteriorates over time and may no longer respond to normal operating pressures.
Step-by-Step Fix
- Inspect the vent termination — Check both the exhaust and combustion air intake caps (if applicable) for obstructions. Clear any ice, debris, or blockage.
- Check the pressure switch hose — With power off, trace the small rubber hose from the inducer housing to the pressure switch. Feel for soft spots, cracks, or disconnections. Blow through it to confirm it is clear. Replace if cracked.
- Test the inducer motor and capacitor — Restore power and listen for the inducer during a heat call startup. A sluggish or loud motor suggests a failing capacitor or bearing. Test the capacitor with a capacitor meter.
- Verify pressure switch operation — With the inducer running, use a manometer at the hose fitting on the inducer housing to measure actual draft pressure. Compare to the pressure switch rating stamped on the switch body. If draft is within spec but the switch stays open, replace the switch.
- Reset and confirm — Power cycle the furnace, run a full heat cycle, and verify no E2 code returns.
Parts Often Needed
| Part | Notes |
|---|---|
| Pressure switch | Match Coleman/York part number; check pressure rating |
| Pressure switch hose | 1/4” ID rubber or silicone; available in bulk |
| Inducer motor capacitor | Check before ordering a full motor assembly |
| Induced draft motor | Replace if capacitor is good but motor runs slow or noisy |
Need Replacement Parts?
Before ordering, match the furnace part to the model number, electrical rating, and failure symptom. Check current prices on Amazon - prices and availability change frequently.
When to Call a Pro
If the flue is clear and the inducer runs at speed but the pressure switch still won’t close, have a licensed HVAC technician verify that the heat exchanger is not cracked (a crack can alter pressure differential in the flue) and that the pressure switch rating matches the furnace model requirements.