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When the thermostat sends a signal, the furnace controls tell this valve to open. It supplies fuel to the burners for ignition and shuts the supply off when the heating cycle finishes or if a safety switch opens.
Specifications
- Part number: EF34CW246
- Brand: Carrier
- Part type: Gas valve
- Height: 4.7"
- Length: 3.6"
- Width: 3.5"
- Gas type: natural gas or propane, as listed
- Ignition: same type as your furnace
- Pipe size and BTU: same pipe size, rated for your furnace
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
How the gas valve works
A gas valve acts as the primary gatekeeper for the fuel entering your heating system. It stays closed until the furnace confirms that it is safe to light.
Most home control boards send a 24 V control signal to the valve solenoids. Once the furnace runs its safety checks, the valve opens to release fuel to the burners. If the burners fail to light, or if safety controls detect an issue, the valve closes to stop fuel flow.
Physical dimensions and measurements
When comparing your current part with this reference, physical measurements help confirm the valve will fit in the furnace cabinet alongside the piping.
- Height: 4.7"
- Length: 3.6"
- Width: 3.5"
Confirming the right valve match
Installing the wrong valve can cause serious operating hazards. Always confirm that the replacement matches the specific heating setup of your equipment.
- Gas type: Must match natural gas or propane, as listed for your system.
- Ignition: Must use the same type of ignition as your furnace.
- Pipe size and BTU: Must share the same pipe size and be rated for your furnace.
Replacement safety and wiring
Working around gas lines and electrical controls requires care. Turn off the electrical power at the breaker before working on any furnace components.
Before loosening any electrical connections, take a clear photo of every wire. Move wires one at a time to the matching spots on the replacement part to avoid wiring mistakes.
Read your old part
- Turn off electrical power to the furnace at the circuit breaker.
- Locate the metal label or stamped plate directly on the body of your existing gas valve.
- Check the part number on your old valve to see if it reads EF34CW246.
- Examine the inlet and outlet pipe sizes to confirm they match your furnace gas lines.
- Verify whether your unit runs on natural gas or propane before choosing a replacement.
When to call a pro
Gas valve work means opening gas lines and setting gas pressure. A licensed tech should do it. Hire a licensed HVAC technician for any step you are not sure you can do safely.
Questions
What control voltage operates this type of gas valve?
Most home thermostats, contactor coils and control boards use a 24 V control signal from a transformer. This low voltage signal tells the valve solenoids when to open and close.
What should I do if I smell gas near the furnace?
If you smell gas, do not touch any switch. Leave the house and call your gas company from outside. Do not use phones inside the home.
Can I bypass a furnace switch to test if the gas valve is bad?
No. Never bypass a flame sensor, pressure switch, limit switch, rollout switch or float switch. They are safety devices designed to protect your home from dangerous conditions.
Can I replace a gas valve myself?
Gas valve work means opening gas lines and setting gas pressure. We strongly suggest a licensed tech does the install. Hire a licensed HVAC technician for any step you are not sure you can do safely.
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Brand names and part numbers identify the part and show fit. HVAC Fitter is not affiliated with, authorized by, or endorsed by any equipment maker. If you are not sure a repair is safe for you, call a licensed HVAC technician.