c2
Moderate
Rheem · HVAC Systems & Water Heaters
Blower/Fan Fault (Tankless Water Heater)
Quick Answer
Error code C2 on your Rheem HVAC Systems & Water Heaters means: Blower/Fan Fault (Tankless Water Heater). This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Listen for the blower motor during a hot water call (it should start before ignition)
2
Check the blower motor connector at the control board for secure connection
3
Inspect the blower fan for debris or physical damage
4
Measure voltage at the blower motor leads during operation
5
Blower motor replacement on a sealed combustion tankless unit should be performed by a licensed technician
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Combustion blower motor
Fan blade
Control board (if driver circuit failed)
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