Gas Water Heater Repair & Installation in Dunwoody, GA

A gas water heater that works for a few days and then goes cold, or whose burner shuts off partway through heating, frustrates plenty of Dunwoody homeowners. For gas water heater repair of this kind, Alpha Plumbing and Sewer often looks first at the bottom of the heater, where modern safety designs can quietly starve the burner of air.

The sealed combustion chamber on newer heaters

Most residential gas tank heaters made since the early 2000s are built to resist igniting flammable vapors, such as gasoline fumes in a garage. They do it with a sealed combustion chamber that takes in air through a flame arrestor, a fine screen or perforated plate beneath the burner. The design makes the heater safer, but it also means everything the burner breathes passes through that screen, and some models add an intake screen around the base as well.

How a clogged air path shows up

• The pilot goes out every few days or weeks, then relights normally.
• The main burner flame looks yellow, floppy or smaller than it once did.
• The heater shuts down and refuses to relight until it has cooled for a while.
• Lint, pet hair or dust coats the base of the heater or the floor around it.

Heaters near laundry areas, in dusty garages or in homes with pets tend to clog faster.

The thermal switch and other safety shutoffs

Many of these heaters also carry a thermal cutoff, a heat-sensitive switch near the combustion chamber that shuts off the gas if flames roll out or the chamber overheats. On some models it can be reset; on others it has to be replaced once tripped. A tripped switch is a symptom rather than the fault itself. It usually points to restricted air, a dirty burner or a venting problem, and replacing the switch without fixing the cause simply sets up the next shutdown.

What else can make a burner quit

Not every intermittent outage comes from the air supply. A weakening thermocouple or thermopile, a flame sensor coated with residue on electronic-ignition models, a failing gas control valve, low gas pressure when several appliances run at once, or downdraft through the vent can all produce similar symptoms. We work through them in order, starting with the simplest checks.

How the repair is done

We shut off the gas, open the burner access where the design allows and inspect the burner, the pilot and the flame arrestor. Outer intake screens can often be cleaned. A flame arrestor that is badly clogged or rusted may not be serviceable on some models, and on an older heater that can tip the decision toward replacement. We then check the thermal switch, the pilot assembly and the vent, relight the heater and watch it through a full cycle. If replacement wins out, the alternatives to another gas tank include a tankless water heater and an electric water heater, which has no burner to clog; our Georgia water heater overview sets out the options.

Dunwoody permits for plumbing repair

Dunwoody covers a stand-alone plumbing repair with a single trade component permit, and work generally waits until it is issued. According to the city's permits and inspections FAQ, permits go to contractors holding a state license or to an owner who lives in the home. When a job needs that permit, we apply for it and book the inspection.

Questions about gas water heaters that keep shutting off in Dunwoody

Can I clean the air intake screen myself?

Many manufacturers describe vacuuming or brushing the outer intake screen as routine owner maintenance, done with the heater turned off and cool. Check your manual first. The flame arrestor inside the combustion chamber is a different matter, and opening a sealed chamber is work for a plumber, because its seals and gaskets have to go back exactly right.

Why does my heater relight fine and then go out again?

A heater that relights normally but fails again after days or weeks usually has a cause that builds up gradually: lint gathering on a screen, a thermocouple growing weaker, or a draft problem that appears only in certain weather or when particular fans run. Noting when the outages happen, and what else was running at the time, helps narrow it down.

Is it safe to keep relighting the pilot?

Relighting once or twice by following the label instructions is reasonable. Repeated outages mean a safety device is shutting off the gas for a reason, and that reason needs finding. If there is ever a smell of gas, relighting is off the table; get outside and call the gas utility or 911 from there.

Stop the repeated shutdowns

A Dunwoody water heater that keeps going cold usually has a cause that can be found. Phone Alpha Plumbing and Sewer at (404) 409-4448 and tell us how often it quits and where the heater sits.