When the temperature drops in the Mid-Willamette Valley, your boiler is the heart of your home. But like any complex machine, it can struggle over time. Whether you are hearing strange clanking sounds or waking up to a freezing house, it helps to understand what is going on behind the metal casing.
At Focus Heating and Cooling, we believe in empowering our neighbors with information. While some issues require a professional touch, others can be diagnosed—and sometimes fixed—by you.
Here is a guide to the most common boiler problems and solutions we see in the Santiam Canyon, and how to know when it’s time to call in the experts.
No Heat or Inadequate Heating
There are few things worse than waking up to a cold house in the middle of January. If your boiler seems to be running but the radiators are stone cold (or only lukewarm), the issue is often a communication breakdown or a flow problem.
Commonly, this is caused by a thermostat that has lost its connection or battery power. It could also be a failed circulation pump that isn’t pushing water to the radiators, or low system pressure preventing the heat from traveling effectively.
How to Troubleshoot:
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Check the Thermostat:
Ensure it is set to “Heat” and the temperature is set higher than the current room temperature. If it’s wireless, try replacing the batteries.
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Check the Pressure:
Look at the gauge on the front of your boiler. If it reads below 1 bar, the system lacks the force to move water around.
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Bleed the Radiators:
If a radiator is hot at the bottom but cold at the top, air is trapped inside. Use a radiator key to “bleed” the air out until water trickles.
If these steps don’t work, a motorized valve or the pump itself may have failed, requiring a professional repair.
Strange Noises (Kettling, Banging, Whistling)
Boilers are designed to run quietly, so if yours sounds like a tea kettle boiling over or a hammer hitting a pipe, something is wrong.
“Kettling” is a rumbling or whistling sound often caused by limescale buildup on the heat exchanger. This mineral deposit restricts water flow, causing the water to steam and expand loudly inside the unit. Banging noises, often called “water hammer,” usually indicate air trapped in the pipes or a sudden valve closure.
How to Fix the Noise:
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Bleed the System:
Much like with heating issues, releasing trapped air from your radiators can often silence whistling and banging pipes.
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Schedule a Flush:
If the noise persists, your system likely needs a professional chemical flush to dissolve the limescale buildup and restore efficiency.
Boiler Leaking or Dripping
Finding a puddle of water underneath your boiler is never a good sign. Not only can this cause water damage to your flooring, but it also indicates that an internal component has failed.
Leaks often stem from a pressure relief valve that is discharging water because the system pressure is too high. Alternatively, it could be a sign of corrosion on old pipes or seals that have loosened over the years of expansion and contraction.
What to Do:
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Check the Pressure Gauge:
If the pressure is too high (above 2.5 bar), you may have accidentally left the filling loop open.
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Call a Professional:
Water and electrical components are a dangerous mix. If you see a leak, turn off the system and contact Focus Heating and Cooling immediately to prevent further damage.
Pilot Light Goes Out
Older boilers rely on a permanent blue flame—the pilot light—to ignite the gas. If this light keeps going out, your boiler cannot fire up to heat the water.
This is almost always a safety mechanism at work. A component called a “thermocouple” detects the heat from the flame; if the flame wavers or the thermocouple is broken, it shuts off the gas supply to prevent a dangerous gas leak.
Steps to Restore the Flame:
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Attempt a Relight:
Follow the instructions in your manufacturer’s manual to relight the pilot.
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Check for Drafts:
Ensure a draft in your utility room isn’t simply blowing the flame out.
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Sensor Replacement:
If the flame lights but dies as soon as you release the control button, the thermocouple is likely dead and needs replacement.
Low Boiler Pressure
Boilers operate within a specific “Goldilocks” zone of pressure—usually between 1.0 and 1.5 bar. If the pressure drops too low, the system will shut down as a safety precaution.
Pressure usually drops for one of two reasons: there is a leak in the system (which could be a tiny pinhole behind a wall), or you recently bled the radiators and released too much pressure.
How to Repressurize:
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Top Up the System:
Locate the filling loop (usually a silver flexible hose) and open the valve to let water in. Watch the gauge closely and close the valve once it hits 1.5 bar.
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Monitor Closely:
If the pressure drops again within a few days, you likely have a hidden leak that a technician needs to locate.
Prevent Problems with the Comfort Club
The best way to avoid the stress of a breakdown is proactive care. Many of these boiler problems, like limescale buildup and worn-out seals, can be caught early during an annual tune-up, long before they leave you in the cold.
By joining the Focus Comfort Club, you get annual inspections, priority scheduling, and discounts on repairs. It’s the easiest way to ensure your home stays warm through the Oregon winter.
Need Help Troubleshooting Your Boiler?
If you’ve tried these solutions and your boiler still isn’t working, don’t risk your safety or comfort. Our team is experienced, honest, and ready to help you make the best decision for your home.
Contact Focus Heating & Cooling Today
