Boiler Not Working? Common Problems and Quick Fixes

When your boiler stops working, it’s more than an inconvenience. The cold creeps in. The pipes groan. Showers run icy, and the house feels unfriendly. If you’re reading this in the middle of a chilly night, you’re not alone. At Aaton Plumbing, we know just how urgent restoring heat can be—especially during a freeze.

Every winter, we help homeowners solve boiler breakdowns fast. You want warmth restored, and you want it done safely. This guide gives you practical steps for quick boiler fixes, clear safety advice, and honest guidance about when it's time for professional emergency plumbing.

Why Is My Boiler Not Working?

Boilers can stop working for many reasons—some simple, some serious. Let’s break down what you might notice:

• No heat or hot water: The radiators stay cold. Showers are freezing.
• Pilot light is out: The little flame inside the boiler won’t stay lit.
• Strange noises: Banging, whistling, or gurgling—your boiler shouldn’t sound like a haunted house.
• Error codes or warning lights: Modern boilers flash codes or lights when something’s wrong.
• Low pressure: The pressure gauge dips below 1 bar.
• Leaks or puddles: Water around your boiler, radiators, or pipes.

Think of your boiler as the heart of your home’s warmth. When it falters, the whole house feels it. Sometimes the problem is a hiccup; sometimes it’s a bigger issue inside the pipes, gas supply, or electronics.

Boiler Safety Checklist 🛑

Before you touch anything, safety comes first. Boilers use gas, electricity, and pressurized water. Always:

• Turn off the power to the boiler at the wall switch or breaker.
• Smell gas? Leave immediately. Call your gas utility. Gas leaks are deadly serious.
• Never remove the boiler cover unless you’re Gas Safe registered (required by law).
• Keep children and pets away from the work area.
• If water is leaking near electrical outlets, do not approach—turn off power at the main breaker.

For detailed safety guidance, check the U.S. Consumer Product Safety Commission (CPSC) and your local building codes.

DIY Boiler Troubleshooting

Some boiler problems have simple fixes. Here’s how you can try to get heat back—safely.

1. Check the Thermostat

• Make sure it’s set to “heat” and above room temperature.
• Replace the batteries if the display is blank.

2. Inspect the Boiler Pressure

• Look at the pressure gauge (usually on the front). If it’s below 1 bar, your system may need more water.
• To top up: Find the filling loop under the boiler. Slowly open it until the needle rises to 1–1.5 bar, then close tightly.
• Caution: If you’re unsure or pressure drops again soon, call a professional.

3. Reset the Boiler

• Most boilers have a reset button (check your manual).
• Hold for 10 seconds, then release.
• If the error returns, don’t keep resetting—there’s a deeper issue.

4. Relight the Pilot Light (Older Boilers Only)

• Follow the instructions on the boiler’s label.
• You usually press and hold the reset while lighting the pilot.
• If it won’t stay lit, the thermocouple or gas supply may be faulty. Stop and call for help.

5. Bleed the Radiators

• If some radiators are cold at the top, air may be trapped inside.
• Turn the heating off. Use a radiator key to open the bleed valve—hold a bowl underneath.
• When water dribbles out, close the valve.
• Top up pressure if needed.

6. Check for Frozen Condensate Pipe (Winter Tip) ❄️

• In cold climates, a white plastic pipe runs outside from your boiler. If it freezes, your boiler may shut down.
• To thaw: Pour warm (not boiling) water over the pipe or wrap with a warm towel.
• Reset your boiler.
• If freezing keeps happening, insulation or rerouting may be needed.

7. Look for Obvious Leaks

• Water on the floor? Switch the boiler off.
• Small leaks may be from joints or valves—tighten gently if you can see the source.
• Never open the boiler casing.

If these tips don’t restore heat—or if you’re unsure—don’t push your luck. Some problems, like faulty gas valves or electrical faults, are not safe DIY jobs.

When to Call a Professional

Sometimes the only smart move is to step back and call for emergency plumbing. Call Aaton Plumbing if:

• You smell gas or suspect a gas leak.
• The boiler is leaking water onto electrical outlets or wiring.
• The boiler makes loud banging or clanging noises.
• You see repeated error codes or warning lights.
• The pilot light won’t stay lit, or won’t relight at all.
• The boiler switches off soon after turning on.
• No DIY steps restore heat, or you’re not comfortable trying them.

Remember, in most regions, it’s illegal for anyone but a registered professional to open up a gas boiler. Safety first—always.

What a Professional Will Do On Arrival

When a licensed technician from Aaton Plumbing arrives, here’s what you can expect:

• Visual inspection: We check for leaks, corrosion, and obvious signs of trouble.
• Gas safety checks: Using specialized equipment, we test for leaks and correct gas flow.
• Pressure and controls: We inspect and safely adjust system pressure.
• Component testing: We check the thermocouple, ignition system, and pumps.
• Condensate and venting: In cold climates, we ensure external pipes aren’t frozen or blocked.
• Code compliance: We verify installation meets local safety and building codes.

Our techs bring parts and tools for most common repairs, so you’re not left in the cold.

Prevention and Boiler Maintenance

Regular care keeps your boiler running smoothly and helps prevent breakdowns during the harshest winter nights. Here’s what every homeowner can do:

• Schedule an annual boiler service: A professional tune-up catches small issues before they become big ones. It’s also required by most manufacturers to keep warranties valid.
• Bleed radiators each fall: Prevents air pockets and uneven heating.
• Monitor boiler pressure: Check monthly—especially after bleeding radiators.
• Insulate pipes: Especially the condensate pipe outside, to prevent freezing.
• Install a carbon monoxide detector: Essential for every home with gas appliances.
• Keep vents and air intakes clear: Don’t block with boxes or furniture.

Consult your boiler’s manual, and always use a Gas Safe registered pro for servicing.

Boiler Repair Costs & Time Factors

Boiler repair costs can vary widely. Here’s what affects the price and timeline:

• Problem type: Simple fixes (like pressure top-ups) are fast. Replacing major parts (like pumps or heat exchangers) takes longer.
• Boiler age: Older models may need harder-to-find parts.
• Access: Tight or hidden installations may take extra time.
• Emergency vs. scheduled: Emergency plumbing calls (nights/weekends) may have extra fees.

Most common repairs are completed within 1–3 hours. More complex jobs—like gas line installation near you, full system flushes, or major part replacement—can take longer. Always get a clear explanation before work begins.

When Is It a Boiler Emergency?

Some situations just can’t wait:

• No heat during a freeze: Pipes can burst in hours if the temperature drops.
• Suspected gas leak: Leave immediately. Call emergency services.
• Major water leak: Can quickly damage floors and walls.
• Repeated tripping of circuit breakers: Electrical danger.
• Carbon monoxide alarm sounding: Evacuate and seek help.

If you’re ever unsure, call for emergency plumbing. It’s always better safe than sorry.

Boiler Not Working: FAQ

Q: My boiler keeps losing pressure. Should I keep topping it up?
A: No—repeated pressure loss often means there’s a leak or a faulty expansion vessel. Constantly refilling can damage the boiler. Call a professional.

Q: Why does my boiler make banging noises when starting up?
A: This can be “kettling”—caused by limescale buildup or trapped air. It can damage the heat exchanger. Turn off the boiler and call for help.

Q: Is it safe to relight my own pilot light?
A: For older boilers, yes—if you follow the instructions exactly. If you smell gas, don’t try—leave the house immediately.

Q: Can I use a space heater until my boiler is fixed?
A: Yes, but only if it’s positioned safely, away from flammable materials, and never left unattended.

Local & Seasonal Tips for Cold Climates 🌨️

• Keep your heating on low: Even if you’re away, set the thermostat to at least 13°C (55°F) to prevent freezing pipes.
• Open cabinet doors: Let warm air reach pipes under sinks—especially kitchen plumbing on exterior walls.
• Insulate exposed pipes: Use foam insulation sleeves, especially on boiler lines and the condensate pipe.
• Know your main shut-off valve location: In case of leaks, you’ll need to turn off water fast.
• Schedule preventative maintenance before winter hits: Don’t wait for the first cold snap.

Final Word: Warmth Restored, Safely

If your boiler’s on the fritz and DIY steps aren’t working, don’t risk it. Fast, safe, professional help is just a call away. Aaton Plumbing is always ready for emergency plumbing, boiler repair, leak detection, and gas line installation near you.

Call Aaton Plumbing now — or reach us anytime at  877-362-1997 .