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Home  /  Construction  /  How to Fix a Furnace Gas Valve That Won’t Open

How to Fix a Furnace Gas Valve That Won’t Open

Danielle Duran June 09, 2022 Construction Leave a Comment
furnace gas valve stuck

One of the most common problems homeowners face is getting a furnace to turn on. Whether it’s because the device is not working properly or because the pilot light went out, gas valve stuck is one of the biggest problems that need fixing. A blog article explaining how to fix a gas valve that won’t open.

Table of Contents

  • What Causes a Furnace Gas Valve to Lock
  • How to Test for a Defective Gas Valve
  • How to fix a furnace gas valve stuck
  • Conclusion

What Causes a Furnace Gas Valve to Lock

If your furnace gas valve won’t open, it might be time to call a professional. Here are some common causes:

furnace gas valve stuck

1. Is the valve stuck closed? If so, use a plunger or your hand to push and pull on the valve until it opens and then closes freely. Be careful not to damage the valve.

2. Did you change the safety cap on the valve? If so, replace it with the old one and check that it’s tight. If the safety cap is missing or defective, debris can get into the valve and cause it to stick closed.

3. Did you adjust the flame control setting on your furnace? If so, make sure it’s set at “high” or “auto.” Adjustments made in other settings might not work with this valve.

4. Have you tried replacing the pilot light or gas line? A dead pilot light or gas line can stop the valve from opening completely. Check both of these parts carefully before calling a pro.

5. Is there any debris blocking the flue or vent ? Check for openings in the vent system that might allow particles to get into the flue.

6. Did you turn on your furnace yet? If so, wait 30 minutes and check again. A bad thermostat, improperly adjusted flame control setting or dirty pilot light can cause the valve to stick open.

7. Is this a second floor unit or one on an outside chimney? This kind of unit is harder to maintain and may need more frequent tune-ups than others.

8. Have you recently changed your furnace filter? This can slow down airflow inside your home and even cause your heating system to stop working altogether if not cleaned out properly.

How to Test for a Defective Gas Valve

If your furnace gas valve doesn’t open, there’s a good chance it’s defective. Here’s how to test for a defective gas valve:

1. Turn off the power to your furnace.
2. Open your main breaker panel and locate the furnace gas valve.
3. Turn on the power to your furnace and wait until it reaches operating temperature.
4. Close the main breaker panel and open the gas valve to check if it opens. If it doesn’t, there may be a problem with the valve.

How to fix a furnace gas valve stuck

If your furnace gas valve won’t open, it may be due to a binding or jammed safety switch. If the safety switch is the issue, there are a few steps you can take to try and fix the issue.

1. Remove any obstructions from the valve opening. If there is debris blocking the way, use a vacuum cleaner to clear it away.
2. Try lubricating the safety switch with WD-40 or similar lubricant. This will help to free up any obstruction and allow the valve to open.
3. If none of these solutions work, it may be necessary to replace the safety switch. Contact a professional for more help fixing your furnace gas valve that won’t open.

Conclusion

If your furnace gas valve won’t open, there are a few things you can do to try and fix the problem. If the valve is stuck or damaged in some way, you might need to replace it. If that’s not the case, then you can try using a plunger to dislodge the obstruction and open the valve. If all of those solutions fail, then you might need to call a professional for help. In any case, be sure to consult with an expert if your furnace gas valve isn’t working properly.

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About Author

Danielle Duran

Danielle Duran, from Morrison, Colorado, he loves to share his ideas on home and decor.

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