Quick Answer: How Do I Know If My Gas Valve Is Bad On My Water Heater?

What would cause the pilot light to go out on a water heater?

If the pilot flame does not produce enough heat or it goes out, the thermocouple cools off, the electric signal stops and the gas valve closes.

A dirty thermocouple is the most common cause of malfunctioning water heater pilot light..

Why would a gas water heater stop working?

If a gas water heater isn’t heating, a common problem is usually that the pilot light has gone out. This may be caused by the gas valve, the gas supply, or—more likely—the thermocouple located next to the pilot light.

How do you troubleshoot a Honeywell Smart Valve?

How to Troubleshoot a Honeywell SmartValveTurn off the gas supply. … Makes sure the element is good. … Make sure the switch or knob on the SmartValve is on.Make sure the call to heat function on the appliance is compatible with the SmartValve. … Check the line power, transformer, switches, thermostat and wiring. … Check for the proper voltage at the control.More items…

How do you check if a thermocouple is working?

Select the ohms or resistance option on your multimeter. Place one test lead on the side of the thermocouple and the other to the end that screws into the gas valve. If the thermocouple has proper continuity, a small resistance reading should be visible on the multimeter.

How does a water heater gas control valve work?

The gas control valve allows the pilot to be ignited, and the lit pilot heats the thermocouple. Once the water heater thermocouple is heated, it sends a signal to the gas control valve which allows the burner to operate, heating the water in the tank.

Do gas water heaters work without electricity?

Gas water heaters don’t use electricity as a fuel, and many homeowners assume they will work in a power outage. This depends on your gas water heater type. … Even gas water heaters with electric pilot lights can continue to work as they don’t necessarily rely on mains electricity.

Does cleaning a thermocouple help?

If the Thermocouple is faulty it will cause the unit to shut down. How to clean? Remove Thermocouple from pilot assembly, using steel wool or emery cloth to lightly clean the tip removing any soot or build up that might have accorded due to an improper pilot flame.

How do I know if my pressure relief valve is bad?

Signs Your Pressure Valve is BadFlooding: Water should never be gushing from the valve. … Excessive noise: If your water heater is rattling or emitting a high-pitched whistling noise, it’s likely the sound of steam trying to escape the tank, which is a sign of far too much pressure pressing against the inner walls.More items…•

How much does it cost to replace a gas valve?

Gas Valve or Smart Valve If your gas valve needs to have a liquid propane valve added during installation, the price will also be higher by about $50. 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.

How do you reset the gas valve on a water heater?

8 – Reset Gas Valve This will only appear after the gas valve has been shutoff and continues to produce a current to the thermopile. Turn the gas control dial to off and let sit for one minute. If the pilot remains lit you will need to replace the gas control valve.

Are furnace gas valves interchangeable?

Although it’s perfectly fine to fit a new gas valve yourself, if you don’t get it right it can be dangerous. This is because the gas valve regulates the pressure of gas that the furnace is getting, preventing fires and explosions.

What is a smart valve system?

The Smart Valve system uses a 24 VAC powered hot surface pilot gas igniter to ignite the pilot gas. The main gas is ignited in both instances by a pilot gas burner. The Smart Valve system is self-contained, thus eliminating the need for a separately mounted ignition source, usually in the furnace or boiler vestibule.

What trips the reset button on a hot water heater?

While a bad thermostat is the most common reason your water heater’s reset button may trip, it’s not the only one. Other common causes include: … Loose wiring—A loose wire in the water heater can generate heat that can cause the high-limit switch to trip.

What causes a gas valve to go bad?

There are several reasons this valve may stop working properly. 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.

How do I know if my thermocouple is bad on my water heater?

If you can’t get the flame to light at all, and you’re sure the gas is on, there’s probably an obstruction in the pilot tube. If the flame lights and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that’s the sign of a thermocouple malfunction.

What are the symptoms of a bad thermocouple?

Symptoms of Bad thermocouple or dirty thermistor on gas fired equipment: Short cycling or unexplained on-off cycling of heating equipment has also been traced (by one reader) to a dirty or failing thermocouple (possibly the reader meant a dirty thermistor). A less likely problem is a failed gas control valve.

Can a gas valve be repaired?

Furnace gas valves occasionally stop opening and closing properly with age. Sometimes cleaning or repairing them can restore their operation, but when that doesn’t work, replacement is the only option. Gas valves aren’t repaired often because the labor cost would push the price past the cost of a new part.

Will a pilot light stay lit with a bad thermocouple?

Replace the Thermocouple A thermocouple senses the heat of the pilot and allows gas to flow to the burner. A bad thermocouple will shut off gas to both the pilot and the burner so the pilot light won’t stay lit.

How much does it cost to replace a gas valve on a water heater?

A replacement valve costs around $20 and calling in a professional could bring your cost up to $200. This isn’t a steep cost to ensure proper diagnosis and installation.