On the covered Rheem PowerVent water heater, a short flash every four seconds means idle. Rheem's bulletin says there is no call for heat and no fault conditions. First, nothing is wrong when the status light is in the idle pattern.
Differential
Likely causes of “Rheem PowerVent water heater a short flash every four seconds”, and how to tell them apart
- 1
The status light is in the idle pattern, which means there is no call for heat (one flash every four seconds)
What separates it The light flashes once every four seconds and the water is hot
How to confirm Nothing is wrong when the status light is in the idle pattern
- 2
The tank is already hot
What separates it The water has reached the set temperature
How to confirm Draw some hot water and see whether the burner lights
- 3
The thermostat setting is low
What separates it The set point is below the water temperature
How to confirm Raise the setting a little
- 4
A high demand that has been satisfied
What separates it Everyone has finished showering
How to confirm The heater rests until water is used
- 5
No fault conditions present
What separates it The control is healthy
How to confirm Do nothing
Before you touch a setting
Record this first — changing settings destroys the evidence
- The flash pattern and its timing
- Whether the water is hot
- Whether the burner lights when water is used
- The model number
Try in this order
0 of 9 completedWhat to do first
ReversibleNothing is wrong when the status light is in the idle pattern.
Correct only the documented fault domain
ReversibleRheem's bulletin lists the idle pattern with no display code and gives no further step.
Read the pattern
ReversibleOne flash every four seconds is the idle pattern, which means no call for heat and no fault conditions.
Check the water temperature
ReversibleRun a hot tap. If the water is hot, the heater is idle because it is already at temperature.
Draw some hot water
ReversibleUse hot water for a few minutes, and the burner should light when the tank cools.
Check the thermostat setting
ReversibleMake sure the setting is where you want it.
Be patient
ReversibleThe heater only runs when the tank needs heat.
Call for service only if the water is cold
ReversibleA cold tank with an idle pattern points to a control or thermostat problem.
Learn the idle pattern
ReversibleKeep the pattern in mind, since one flash every four seconds is the normal resting state, and anything else deserves a closer look.
Model-specific
What is true of this model and not of its siblings
- The code on this page
- One flash every four seconds: idle, no fault.
- Parts involved
- None; the heater is at temperature.
- Rheem's guidance
- The bulletin gives no further step.
- Reading the heater's lights
- A gas water heater with an electronic control uses its status light to show what it is doing. Patterns of flashes can mean a fault, a lockout or a normal state, and learning the idle pattern saves a call to a technician.
- When idle looks like a fault
- Many owners see the light flashing and assume something is wrong. If the water is hot, nothing is. If the water is cold and the light stays in the idle pattern, the control sees no call for heat, so the thermostat setting or the sensor is the next thing to check.
Stop boundary
When this stops being a self-service repair
- !Rheem's bulletin lists the idle pattern with no display code and gives no further step
- !Only call for service if the water is cold and the light stays in the idle pattern
- !If you smell gas, leave the house and call the gas company
Evidence ledger
Sources behind this answer
Exact questions
Common questions
What does a short flash every four seconds mean on a Rheem PowerVent water heater?+
Idle. Rheem's bulletin says there is no call for heat and no fault conditions.
Why is the burner off?+
The tank is at temperature.
When is it a problem?+
When the water is cold and the pattern does not change.
Is there a display code?+
Rheem's bulletin lists none for this pattern.
How can I tell idle from a fault?+
Idle is one flash every four seconds. A fault shows a group of flashes with a pause, and the count tells you which fault.
Should I do anything when the heater is idle?+
No, the heater is waiting until you use hot water.