Radiators gone cold? We know boilers inside and out

A boiler is only one part of a hydronic heating system. Water or steam leaves it, travels through pipes to radiators, baseboard or radiant floor tubing, and returns to be heated again. When the house goes cold, the fault can sit in the burner, the controls, the pumps, the valves or the piping itself. Good boiler repair means understanding how all of those pieces work together.

We service both hot water boilers, which circulate heated water with a pump, and steam boilers, which boil water and let the steam rise through the pipes on its own. The two behave very differently and fail in different ways, so our technicians start by identifying exactly what kind of system you have, how old it is and what fuel it burns.

Common hot water boiler faults

Pressure problems are among the most frequent. A closed hot water system is usually filled to a modest pressure when cold, and that pressure rises as the water heats. If the gauge climbs too high and the relief valve drips or discharges, the expansion tank has often lost its air cushion. If pressure keeps dropping, there is a leak somewhere or the automatic fill valve has failed. Circulator pumps can seize or lose their impellers, leaving hot water sitting in the boiler while radiators stay cold. Trapped air produces gurgling and cold spots at the top of the system and needs to be purged properly.

Common steam boiler faults

Steam systems depend on correct water level. The low water cutoff shuts the burner down when the level drops, which protects the boiler but leaves you without heat. A dirty or sluggish cutoff, a sight glass that shows surging water or a boiler that needs frequent refilling all point to problems we can trace. Banging pipes, known as water hammer, usually come from pipes that have lost their pitch or from condensate pooling where it should drain back. Radiator vents that stick shut leave individual rooms cold.

Safety and combustion checks

Any burner that uses gas or oil produces combustion gases that must leave the home completely. On every repair visit we check venting, inspect for signs of spillage and test combustion with an analyzer when the burner is running. We look at the flue connection, the draft and the heat exchanger surfaces we can access. A carbon monoxide alarm near sleeping areas is essential in any home with fuel-burning equipment, and we will mention it if we do not see one.

Repair or replace

Many boilers run for decades with proper care, so our default is repair. When a heat exchanger is cracked or leaking, when parts are no longer available, or when repair costs rival a new unit, we will explain the math. Our Boiler Replacement page covers how we size and install new boilers. If the problem turns out to be domestic hot water rather than heat, Water Heater Repair may be the service you need.

Most boiler problems in Adrian, MI surface on the first cold nights of fall, when a system that sat idle all summer is asked to fire again. Stuck circulators, sticky zone valves and low water pressure are common at startup. Running your heat briefly on a mild day in early fall, before you need it, is a simple way to expose those issues while repair appointments are easier to get. If you do lose heat during a hard cold snap, open cabinet doors under sinks on exterior walls and call us promptly to protect the piping.