Rheem · Water heater
Status light: 4 flashes High temperature limit switch open (tank)
What this code means
The water got hotter than the safety limit allows and the high-limit (ECO) switch cut power/gas to stop the burner.
Most likely causes
- Thermostat set too high combined with a partially failed thermostat
- Sediment buildup causing localized overheating
- Failed high-limit (ECO) switch
What to try first
Let the tank cool completely, then check the temperature dial isn't set to its highest position. If it trips again after cooling, stop resetting it — this switch is a safety device.
Safety first: stop using the appliance and shut off its gas or power until it has been inspected — this fault category is associated with fire or gas risk.
FAQ
What does Rheem error code Status light: 4 flashes mean?
High temperature limit switch open (tank). The water got hotter than the safety limit allows and the high-limit (ECO) switch cut power/gas to stop the burner.
Can I fix Rheem code Status light: 4 flashes myself?
No — stop using the appliance and shut off its gas or power until it has been inspected. This fault category is associated with fire or gas risk.
What causes Rheem code Status light: 4 flashes?
The most common causes are: thermostat set too high combined with a partially failed thermostat; sediment buildup causing localized overheating; failed high-limit (eco) switch.
Other Rheem water heater codes
All Rheem water heater error codes →
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This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.