Rheem E2 Error Code

What does Rheem E2 mean?

Error code E2 on the Rheem Performance Condensing ECOH series indicates a combustion fan motor fault. The control board monitors fan current during the pre-purge and ignition sequence; when the fan fails to reach rated speed or draws abnormal current, the board locks out combustion and displays E2. Without adequate combustion air flow, the burner cannot fire safely.

Symptoms

• E2 code displayed on the control panel with burner lockout and no hot water.
• Fan motor is audibly absent or running erratically during the startup sequence.
• Unit attempts to start, pre-purge fails, then locks out.
• Condensation or water damage visible around the fan motor housing.

Common causes

• Failed or seized combustion fan motor unable to reach rated RPM.
• Fan blade loose on the motor shaft, causing insufficient airflow and current anomalies.
• Wiring harness to the fan motor damaged, disconnected, or corroded.
• Control board not supplying correct DC voltage (15–30 V) to the fan circuit.
• Blocked air intake or restricted vent terminal reducing static pressure and overloading the motor.
• Condensation damage to motor windings — common in high-cycling or cold ambient installations.

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Diagnostic steps

1. Manually spin the fan blade

   With the unit de-energized, access the combustion fan and rotate the blade by hand. It must turn freely with no binding or wobble. Resistance or grinding indicates a seized bearing; replace the motor assembly.

2. Check DC supply voltage at the fan connector

   With the unit powered and in startup mode, measure DC voltage at the fan motor connector. The reading should be 15–30 V DC. If voltage is present but the fan does not spin, replace the fan motor. If voltage is absent, test the control board output circuit.

3. Inspect the fan blade and motor shaft

   Confirm the fan blade is tight on the motor shaft and undamaged. A loose blade causes airflow loss without triggering a stall, leading to intermittent E2 faults. Tighten the set screw or replace the blade if cracked.

4. Clear air intake and vent terminal

   Inspect the combustion air inlet and exhaust vent terminal for debris, bird nests, ice blockages, or kinks in PVC vent runs. Any restriction increases static pressure on the fan motor and can trigger an overcurrent fault.

5. Inspect wiring harness for damage or corrosion

   Trace the fan motor harness from the motor to the control board. Look for chafed insulation, corroded terminals, or loose connector pins. Repair or replace damaged sections; reseat connectors and retest.

When to call a professional

Replace the combustion fan motor or control board only with a licensed technician. These components require proper torque procedures, voltage verification under load, and gas-side commissioning after reinstallation. Incorrect fan installation can create dangerous combustion air deficiency, risking carbon monoxide production. Rheem condensing units also require certified startup to validate safe operation after component swaps.