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MEDIUM URGENCY

Rheem Code 55 - Pressure Switch Issue

Code 55

Pressure switch fault - vent, inducer, or switch issue.

Brand: Rheem (Also covers Ruud)  |  Equipment: Gas Furnace

What This Code Means

Code 55 on Rheem (Ruud) indicates a pressure switch fault. Usually means insufficient draft when inducer runs, or switch is stuck.

Likely Causes (Ranked)

Most common

Blocked exhaust vent

What: Snow, ice, debris in vent.

How to check: Inspect outdoor exhaust outlet.

Fix: Clear blockage.

Shop parts
Common

Failed inducer motor

What: Insufficient draft to close switch.

How to check: Listen at startup.

Fix: Replace inducer.

Shop parts
Common

Bad pressure switch

What: Switch fails intermittently.

How to check: Tech test with manometer.

Fix: Replace switch.

Shop parts

Diagnostic Steps

  1. Check outdoor exhaust outlet
  2. Listen for inducer
  3. Inspect pressure tubing
  4. Replace switch if needed

Frequently Asked Questions

Most common Rheem code 55 cause?
Blocked exhaust vent, especially in winter.
DIY?
Vent clearing yes. Inducer more advanced.
Same on Ruud?
Yes.

Related Rheem Codes

Rheem Error Code 57

Related Symptoms

Furnace Not Igniting

Need More Help?

Try our interactive symptom diagnostic tool or browse Rheem parts.

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