Why Does My Rheem Water Heater Keep Turning Off?

The Short Answer: A Rheem that keeps shutting off has usually tripped one of its safeties. On atmospheric gas models the pilot may be going out or the control may be flagging low thermopile voltage, overheating, or a chamber problem. On power-vent models the blower and pressure switch are common culprits. On electric models it’s often the high-limit or the breaker. The status light or display usually tells you which.

First, make sure it’s really shutting off

A gas burner or electric element that stops once the water reaches the set temperature is working normally. On Rheem atmospheric heaters a single blue flash every three seconds means the pilot is lit and all is well, even when the burner is off. A real shutdown means the water goes cold and the light changes: it goes dark, turns solid, or flashes red.

Match the pattern to the cause

Atmospheric codes are from Rheem’s Use & Care manual AP23698 (opens in a new tab); power-vent codes are from the power vent manual AP23057 (opens in a new tab). Older models may differ, so check your heater’s label.

What you can check safely

• Write down the light pattern or display code each time it shuts off, and note the time and what else was running.
• Gas supply: confirm the valve is open and other gas appliances work. On propane, check the tank.
• Air and clearance: clean lint and dust around the base and keep stored items and flammable products away.
• Power-vent heaters: check that the outdoor vent is clear and the heater is plugged in.
• Electric heaters: reset a tripped breaker once. If it trips again, leave it off.
• Relight or reset once following the label. If it shuts off again, call for service.

What the technician will check

For gas models, a technician measures thermopile output, inspects the pilot and air intake, checks venting and draft, and tests the chamber sensor and gas control as needed. For power-vent models they check the blower, pressure switch, sensing tube, and vent. For electric models they isolate power and test the elements, thermostats, and high-limit, and look for damaged wiring.

Repair or replace

Most shutdown causes are part-level repairs: a thermopile, pilot assembly, sensor, blower, gas control, element, or thermostat. A heater that is leaking, or old with several failing parts at once, is usually better replaced.

Related: why does my water heater turn off by itself, Rheem thermopile voltage low, and Rheem pressure switch failed open.

Frequently Asked Questions

Q: Why does it shut off only when the dryer or a fan runs? A: Those can create a draft or pull air from the room, which can blow out a pilot or disturb venting. Mention it to the technician; the fix may involve combustion air or venting.

Q: My electric Rheem’s breaker trips after a few minutes. Is that the heater? A: Usually it’s a shorted element or damaged wiring in the heater. See water heater trips breaker after a few minutes.