Can Furnace Gas Valves Be Repaired

If your furnace is giving y'all heating bug, the gas valve may be the culprit.

The gas valve manifold inside the furnace opens and closes to allow your furnace to fire gas to create rut.

Although nigh times there are other things that yous should check before you lot troubleshoot the gas valve.

Showtime things offset- cheque that the gas supply to your furnace is open.

You wouldn't believe how oftentimes it'south something like a airtight gas supply that's causing the issue.

Another thing to check is the switch on the gas valve trunk inside the furnace.

Near gas valves in furnaces have a manual shutoff dial or switch. This shutoff allows you to disable the gas valve inside the furnace.

The shutoff switch on the furnace gas valve needs to be in the "ON" or "OPEN" position for the valve to function.

Ok, now that nosotros got that out of the mode… if your furnace is all the same having gas supply bug and so read further.

Furnace gas valve troubleshooting

To troubleshoot a furnace gas valve, the first thing you demand to check is the furnace's sequence of operations.

The gas valve opens correct subsequently the ignitor activates. So if you don't see your ignitor turning on, and so your gas valve won't open either.

If your ignitor isn't even turning on, so it's likely something else in your furnace that's the problem.

If your ignitor IS turning on, merely your gas valve isn't opening, then it'due south time to starting time troubleshooting. Follow these steps:

1. Plow off power to your furnace.
2. Remove the two wires from their terminals on the gas valve.
3. Stick your multimeter probes into the wires. Turn on your multimeter to AC Voltage fashion (usually shown every bit Five~).
4. Turn ability on to your furnace.
5. Detect your furnace. After the ignitor turns on, and then you should read around 24 or 120 volts on your multimeter (information technology could be 24 or 120 volts, depending on your furnace)
6. If your multimeter does Non read 24 or 120 volts, then it is probably an issue with your command lath.
7. If your multimeter reads 24 or 120 volts AC, so your control lath is sending the correct voltage to your gas valve.

If your control board is sending the correct voltage to the gas valve, then it'due south time to check farther past testing the gas valve itself.

How to test a furnace gas valve

There are a bunch of different things to test on a furnace gas valve.

The first and easiest thing to do is to check the solenoid scroll on the gas valve.

Plow your multimeter on. Select the resistance/ohms fashion (commonly shown as Ω).

Hook up your multimeter's probes to the terminals on the gas valve. If the reading is OL, and then the gas valve is bad.

Another way to test a gas valve is to hit it with a hammer. No, actually- by hitting your gas valve with a hammer, information technology can go unstuck and open up upwards.

The trick is to hit it at the same time that your furnace'south control board sends voltage to information technology.

So give it iii-four seconds subsequently you see your ignitor light upwardly earlier you hit your gas valve.

You don't demand to hitting your gas valve very hard. A few taps with a hammer or wrench will be sufficient.

If your gas valve opens up after hit it, and so yous'll go heating for a while.

However, the valve is notwithstanding bad. One time the valve closes again, it will take another tap of the hammer to get it to open up once more. The valve is bad and needs to exist replaced.

Replacing a furnace gas valve

Replacing a furnace gas valve is a tough job. In fact, in many areas, it may be illegal for you to do information technology yourself since it comes into contact with your municipal gas system.

If your furnace gas valve needs to be replaced, I recommend hiring an HVAC contractor to do it for you.

Source: https://hvactrainingshop.com/furnace-gas-valve-stuck/

Posted by: walkerherhumbrod.blogspot.com

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