Rheem HVAC Systems & Water Heaters

21 known error codes

1 flash Easy Fix

Low Heat Call Active

10 flashes Moderate

12VDC Flame Sense Circuit Fault

2 flashes Easy Fix

Low Heat Call Satisfied

3 flashes Easy Fix

High Heat Call Active

4 flashes Easy Fix

High Heat Call Satisfied

5 flashes Moderate

Ignition Fault

6 flashes Easy Fix

Pressure Switch Fault

7 flashes Moderate

Limit Switch Open

8 flashes Moderate

Flame Lost During Operation

9 flashes Moderate

Polarity Issue

C2 Moderate

Blower/Fan Fault (Tankless Water Heater)

C7 Moderate

Flame Rod Issue (Tankless Water Heater)

E1 Moderate

Sensor Failure (Water Heater)

E2 Moderate

Sensor Short (Water Heater)

E3 Moderate

Dry Fire Protection (Water Heater)

E4 Moderate

High Temperature Cutoff (Water Heater)

E5 Moderate

Sensor Failure (Tankless Water Heater)

F1 Moderate

False Flame Detection (Tankless Water Heater)

F4 Moderate

Thermal Fuse Activated (Tankless Water Heater)

F6 Moderate

Vent Blocked (Tankless Water Heater)

F7 Moderate

Gas Valve Failure (Tankless Water Heater)