Can a flame sensor be bypassed?

In short, you cannot bypass the flame sensor and manually light your furnace. Bypassing safety controls, even when possible, should never be done. Instead, you should try cleaning or replacing your flame sensor to get it and your furnace back to good working order.

What causes a flame sensor to go bad?

What Causes a Flame Sensor to Get Dirty? It’s possible for a flame sensor to go bad; but more often than not, it is not broken, just dirty from carbon buildup. Because a flame sensor has a very low tolerance for variations in the reading it takes, the slightest coating of carbon can cause it to misread and shut down.

When should I replace my flame sensor?

Generally speaking, the flame sensor should be replaced every two to three years as preventative maintenance. Some technicians also recommend changing it any time that there is a flame current issue.

How often should you clean flame sensor?

Generally speaking, the flame sensor should be replaced every two to three years as preventative maintenance.

Can I clean a flame sensor?

Cleaning Your Flame Sensor Remove the sensor and clean it using steel wool, light-grit sandpaper, or emery cloth. Be sure to remove any dust, grit, or rust. Clear any dust from the furnace pilot and electronic igniter, then replace the sensor, and close the combustion chamber door. Restart your furnace.

What do you need to know about a flame sensor?

A flame sensor is designed to regulate the flow of gas from a gas valve, much like a thermocouple. Testing one is essential to maintaining proper and safe functionality of a gas-powered device regulated by a flame sensor, such as a gas dryer, furnace or water boiler.

How does flame sensing work in a furnace?

Flame sensing rods stick out into the flame and connect back to the furnace board. Once the board sends a call to the gas valve to open, it monitors the current flow on the flame sensing rod. It generates a potential (voltage) at the flame sensing terminal; this terminal is connected to the sensor with a conductor.

What should I do if my furnace flame sensor is dirty?

The porcelain is an important insulator that stops the sensor from being grounded on the bracket of the furnace. As with most maintenance issues, cleaning a furnace flame sensor is a multi-step process that’s not difficult but can be exacting. If you’re not sure of any aspect of it, it’s probably a good idea to call on the professionals.

Can a thermocouple be used as a flame sensor?

In truth, while they basically perform the same job, they’re not the same thing. If your furnace uses an electronic controller, it’s got a flame sensor. Thermocouples are used on standing pilot furnaces that have pilot lights.