Rheem tankless water heater shows E32 and will not operate

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Outlet thermistor reading out-of-range, Sensor not properly attached to outlet pipe, Damaged sensor wiring

Safety first: Turn OFF power and water supply.

Inspect outlet thermistor: Verify it is firmly attached to the outlet pipe or manifold and not hanging loose.
Check connector: Ensure the plug is fully seated on the control board.
Compare temperature: Use a thermometer at a hot tap and compare to the unit's displayed outlet temperature. Replace the sensor if readings are clearly wrong.
Install new sensor: Shut off water, relieve pressure, remove the old sensor, and install the new outlet thermistor with proper sealing.

Medium 3/5

Outlet Thermistor

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