A004 🟡 Repair Required
Rheem Error Code A004: False Flame Detection
⚠️ Your Rheem furnace has detected a false flame, which could lead to system damage if not addressed.
How to Fix Rheem Code A004
- Step 1: Turn off the furnace at the thermostat and the power switch on the furnace.
- Step 2: Wait 30 seconds, then turn the power switch back on. If the furnace comes on and the error code is gone, the issue might be resolved. If not, proceed to the next step.
- Step 3: Call a professional HVAC technician. Do not attempt to open the furnace or tamper with any internal components.
What Does Rheem Error Code A004 Mean?
The A004 error on your Rheem furnace indicates a false flame detection issue. This means the system's flame sensor has detected a flame when there shouldn't be one, causing the furnace to shut down to prevent potential damage. This is a safety feature, but it's important to address the underlying cause to restore proper function.
Common Causes of Rheem Code A004
- Dirty or faulty flame sensor
- Incorrect gas pressure
- Electrical issues in the ignition system
- Clogged or damaged inducer fan
Applicable Rheem Models
Need a Pro to Fix Rheem Code A004?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Rheem Tankless Water Heater Code A004
Flame Sensor OEM: RHE-4800100
Inducer Fan OEM: RHE-4800200