By the WY&G, Inc. team: licensed HVAC contractor, CSLB C-20 #1044922, over 25 years and thousands of customers in the Santa Clarita Valley and Orange County.
Why so many local homes still have them
Walk through older neighborhoods in Newhall, Sylmar, San Fernando or Van Nuys and you'll find plenty of houses heated by a single gas wall furnace in the hallway. They were the standard choice before ducted central heat became common, and a lot of them are still in the wall decades later. They're simple machines, which is why they last. It's also why a small worn part can leave you with no heat at all.
Most older wall heaters use a standing pilot: a small flame that burns all the time. That pilot heats a thermocouple or a thermopile, which makes a tiny electric current. The current tells the gas valve it's safe to send gas to the main burner. When the thermostat calls for heat, the burner lights off the pilot. Many of these units don't need household power at all, unless they have a blower fan.
Safe checks you can do yourself
- Thermostat. Some heaters have a wall thermostat, others have a dial on the unit. Turn it up 5 degrees above room temperature and wait a minute. If the wall thermostat has batteries, replace them.
- Gas to the house. Does the stove light? Does the water heater make hot water? If no gas appliance works, the gas may be off at the meter. Call SoCalGas. Don't turn the meter valve back on yourself.
- Look for the pilot. Most units have a small viewing window or an opening near the bottom. If you see a steady blue flame, the pilot is fine and the problem is further along.
- Relight only if the label allows it. The lighting instructions are printed on a plate inside the lower panel. Follow them step by step, and only if you don't smell gas. If the pilot goes out again after one or two tries, stop there.
- Power for fan models. If your heater has a blower, check the breaker and any plug or switch near the unit.
- Clear the front. Move furniture, curtains, boxes and toys well away from the grille. Vacuum dust off the grille when the heater is off and cool.
That's the full list. Gas valves, burners, pilot assemblies and vent pipes are jobs for a licensed technician.
Stop and call if you notice any of these
- Gas smell or rotten egg odor. Don't flip switches or light anything. Get everyone out and call SoCalGas or 911 from outside.
- The pilot won't stay lit. Almost always a weak thermocouple or thermopile, a dirty pilot, or a draft. It's a common repair.
- Yellow, tall or flickering flame, or black soot on the wall above the grille. That's poor combustion and it can mean carbon monoxide.
- Your CO alarm goes off. Leave the house and call 911.
- The pilot is lit but the burner never comes on. Usually the thermostat, its wiring, or the gas valve.
- A burning smell that lasts more than the first few minutes of the season.
- Rust, holes or cracks you can see around the burner area.
Wall heaters and carbon monoxide
A vented wall furnace sends its exhaust up a metal pipe inside the wall and out through the roof. If that vent is disconnected, rusted through or blocked by a bird nest, exhaust can spill back into the room. You won't smell carbon monoxide. That's why every home with a gas wall heater needs working CO alarms near the bedrooms, and why we look at the vent and the flame on every wall heater visit.
Repair it or replace it?
Many wall heaters are worth repairing. Thermocouples, thermopiles and thermostats are common parts and usually quick to swap. It gets harder with very old units, where the original gas valve or burner may no longer be made. Replacement makes sense when the combustion chamber is cracked or rusted through, when parts can't be found, or when the heater simply can't keep the house warm.
If you do replace it, you have options. A new wall furnace fits the same opening in many cases. Some homeowners use the moment to add a ductless heat pump instead, which heats and cools. A gas appliance replacement usually needs a permit, and a licensed contractor handles that. We're licensed under CSLB C-20 #1044922 and can walk you through both paths.
Wall heater repair in Santa Clarita and the San Fernando Valley
WY&G has worked on heating systems in this area for over 25 years, and older wall furnaces are a regular part of our winter work. Most repairs happen the same day you call. See wall and floor heater repair, or find your area: Newhall, Sylmar, San Fernando, Van Nuys.
Call (323) 240-2373 or book online. Use code WEB25 for $25 off (details on our coupons page).
