6 flashes
Easy Fix
Rheem · HVAC Systems & Water Heaters
Pressure Switch Fault
Quick Answer
Error code 6 flashes on your Rheem HVAC Systems & Water Heaters means: Pressure Switch Fault. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Inspect the flue pipe and combustion air intake for blockages
2
Check the pressure switch hose for cracks, kinks, or disconnections
3
Verify the inducer motor is running at the start of a heating cycle
4
Clear the condensate drain line using compressed air or a wet-dry vacuum
5
Measure the pressure differential at the switch port with a manometer during inducer operation
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Pressure switch
Pressure switch tubing
Inducer motor assembly
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