Why does my heater sputter?

The ignitor heats up, the burners ignite and heat up the plenum, approx 20-30 seconds later the blower fan turns on. When the fan comes on the flame starts to make a sputtering noise and becomes a little unstable.

Why is the flame sensor on my gas furnace not working?

The control board will “time out” if it does not detect the flame (low voltage) within the time period. If the flame is slow to light the “time out” can occur even though there is a good circuit back to the control board. If the flame does not burn steadily on the flame sensor it can interrupt the circuit. Slow ignition is not a common problem.

What does it mean when a gas furnace goes out?

If the flame comes on and then goes out in a short time, that is classic symptom of a flame sensor or a bad ground for the control board. Variations from that symptom would be pointing to some other malfunction. Thanks for this tip.

What does 7 blinks mean on flame sensor?

7 blinks is the error code for “flame could not be established.” The classic symptom for flame sensor is: the burner flame comes on but goes out within seconds. Cleaning or replacing the flame sensor is the usual solution. You did not mention if you are experiencing these symptoms after replacing the flame sensor

Why does my gas burner go out when power is cut off?

When the power is cut off to the gas valve, the burner should go out when the voltage is turned off by the board. I am guessing that the error code is intermittent, so I would be prepared to cycle the valve a number of times before the malfunction and the error code appears.

What does the blinking red light on my furnace mean?

He suggested looking for an indicator light, seeing if there was a pattern and, if there was, looking in the manual to see what it meant. I found the light on the bottom panel of the furnace: Turns out, the red furnace indicator light uses Morse code to spell out a problem number, which you can then look up in your furnace’s owner manual.

What does it mean when your furnace flashes on and off?

Interpret one LED flash that blinks on and off to mean your furnace has locked out because it could not ignite after three tries, and must be reset. Interrupt power to your furnace for 20 seconds or lower the thermostat so your furnace does not try to heat, then reset the thermostat to the previous setting.

What does it mean when your furnace has a fault code?

With this fault code the control will turn on both the inducer motor and supply air blower. A gas valve that leaks through or is slow closing would typically cause this fault. 2 RED FLASHES: This indicates that the normally open pressure switch contacts are stuck in the closed position.

What to do if your furnace has an open pressure switch?

Turn off the furnace power and repair a short or replace the pressure switch. 4. Read three LED flashes to mean your furnace has an open pressure switch circuit or it has an induced draft blower operating. Check the pressure switch hose of your furnace for blocks or an improper connection.