## How many millivolts does it take to open a gas valve?

on/off switch. Thermopile Output- MAIN BURNER ON: 110 mv minimum required for system to operate consistently. If lower than 110 mv, conduct valve operating head test.

How does millivolt gas valve work?

1. Millivolt Gas Valve. This type of valve makes use of a standing pilot that continuously burns to heat a device, either a thermocouple or thermopile, which then produces a small amount of electricity – less than a single volt, hence “milli”-volt.

How do I know if my gas valve is bad?

If 24 volts is coming from the board to the gas valve terminals and you don’t hear that little clicking noise the internal valve makes, you could have a bad gas valve. To double-check, take the leads off to the gas valve and check there. Got 24 volts? Then something downstream of that 24 volts is not working.

### How do I know if my gas valve is bad on my fireplace?

One way to test if your main control valve is bad is by testing resistance. We can do this with our Digital Multimeter. First, find you need to find “Zero” but touching your multimeter leads together. If it reads anything other than zero, you’ll want to subtract this number from the number you will read on the valve.

How do you know if you have a bad thermopile?

When you turn the wall switch on, If your meter reads 0 or very low, you know you have a short in your thermopile and you should replace it.

How do I know if my thermopile is bad?

Just like the thermocouple, the thermopile can be read with a multimeter to check if it’s the cause of the problem. Three hundred millivolts or higher voltage is a sign of a good thermopile. A reading below 300 millivolts would require you to replace the thermopile.

#### Does the thermopile open gas valve?

The pilot light hits the thermocouple and the thermopile simultaneously. When the unit calls for heat (either by thermostat or simply being turned ON), the thermopile puts out enough voltage to open the electromagnet in the gas valve that sends fuel to the burner, turning on your fireplace!

How much does it cost to replace a gas valve?

Universal gas valves are cheaper than brand name valves. With all this in mind, the price for a replacement job on a gas valve ranges from \$195 to \$870.

What causes furnace gas valve failure?

The valve itself may have simply worn out or may be damaged due to basement seepage or submersion. Alternately, one of the electronic gas ignition components or a glitch in the safety circuit may be to blame. If your furnace has a standing pilot light, the thermocouple could be worn out.

## How often should I troubleshoot my gas fireplace?

Taking the time a couple times a year to keep everything clean will greatly increase the lifespan and efficiency of your gas fireplace. Troubleshooting fireplace problems will not only improve the overall look and efficiency but also make it much safer.

How does the millivolt gas valve and 750mv thermopile work?

How the Millivolt Gas Valve and 750mv Thermopile Work! Troubleshooting! – YouTube If playback doesn’t begin shortly, try restarting your device.

Why is the pilot light not working on my gas fireplace?

If either of these malfunction than the pilot light will not be able to do its job. The thermocouple is often found in older gas fireplaces and the number one issue related to these is that they aren’t hooked up correctly, or not properly secured.

### What should I do if my gas fireplace smells like gas?

If at any moment when inspecting gas fireplace the area smells tremendously like gas, and you don’t know where it is coming from, then you need to leave the area and get help immediately. Is the Pilot Light Functioning? One of the biggest problems associated with gas fireplaces is related to the pilot light.