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AIR CONDITIONING & HEAT PUMP SYSTEMS
BACKDRAFTING HEATING EQUIPMENT
BACKUP HEAT for HEAT PUMPS
BANGING HEATING PIPES RADIATORS
BLOWER FAN OPERATION & TESTING
BOOKSTORE - InspectAPedia
BTU USAGE MONITORS
CARBON MONOXIDE - CO
CIRCULATOR PUMPS & RELAYS
DIAGNOSTIC GUIDES A/C / HEAT PUMP
DIAGNOSE & FIX HEATING PROBLEMS-BOILER
DIAGNOSE & FIX HEATING PROBLEMS-FURNACE
DIRECT VENTS / SIDE WALL VENTS
DRAFT REGULATORS, DAMPERS, BOOSTERS
DUCT SYSTEM & DUCT DEFECTS
ELECTRIC MOTOR DIAGNOSTIC GUIDE
FAN, AIR HANDLER BLOWER UNIT
FLOODED HEATING EQUIPMENT REPAIR
FLUE SIZE SPECIFICATIONS
GAS BURNER Flame & Noise Defects
GAS PIPING, VALVES, CONTROLS
GEOTHERMAL HEATING SYSTEMS
HEAT PUMPS, DIAGNOSIS, REPAIR
HEATING COST SAVINGS METHODS
HEATING OIL PIPING TROUBLES
HEATING OIL TANKS
HEATING SYSTEM NOISES
HEATING SYSTEM TYPES
GAS LP & NATURAL GAS SAFETY HAZARDS
MANUALS & PARTS GUIDES - HVAC
MIXING / ANTI-SCALD VALVES
MOTOR OVERLOAD RESET SWITCH
NOISE, HEATING SYSTEMS
ODORS FROM HEATING SYSTEMS
OIL FILTERS on HEATING EQUIPMENT
OIL FILL PIPE LEAKS
OIL SPILL CLEANUP / PREVENTION
PLASTIC Plexvent / Ultravent RECALL
PUFFBACKS, OIL BURNER
RELIEF VALVE LEAKS
Reset Switch - Heater Primary Control
RESET SWITCH - ELECTRIC MOTOR
Reset Switch - Stack Relays
SAFETY, HEATING INSPECTION
SAFETY RECALLS CHIMNEYS VENTS HEATERS
SOLAR HEATING SYSTEM DESIGNS
SOOT on OIL FIRED HEATING EQUIPMENT
STEAM HEATING SYSTEMS
THERMOSTATS, HEATING / COOLING
VIDEO GUIDES: Heating System Videos
WINTERIZE A BUILDING
WOOD, COAL STOVES & FIREPLACES
WOOD STOVE SAFETY
ZONE VALVES, HEATING
Heating zone circulator pump repair procedures for noises: This article describes how to diagnose & fix noisy circulator pumps on hot water or hydronic heating systems.
We distinguish among buzzing relays that control the circulator, vibrating electric motors, shrieking circulator bearings, and circulator pump noises. Understanding the noise made by a heating zone circulator pump and whether or not the noise is normal can help us diagnose and fix equipment without wasting a lot of time chasing the wrong problem.
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Reader Questions: Heating Zone Circulator Pump Noises, heating system noises, or noises when heat is turned off
Humming at the boiler
(Oct 13, 2012) zena123 said:
Help, please ! Central heating system is turned off. However, an unpleasant hum comes from central htg. boiler. When elec. is turned off at consumer unit, humming ceases. Any ideas gratefully received. Tx.
Bang noises at the boiler or expansion tank
(Oct 29, 2012) Jim said:
When circulator pump turns off, there are 4 pairs of bang-bang, which seem loudest at expansion tank. Draining expansion did not change. Heating and other operation is OK. I suspect, and will replace, the coupler between electric motor and impeller.
Trickling water sounds in the heating system
(Jan 10, 2013) Anonymous said:
I hear trickling water on one of my baseboard on my top floor everytime the heat starts to work. It goes away after awhile. I bleed that baseboard and it still trickles.
Squeeking Noise at the heating boiler
(Mar 13, 2014) Steveo said:
I have a squeeking noise that only happens early in the day and then again at night...it is coming from the water-out pipes (hot) and the sound "goes away"...I'm really confused. The pump's coupling was changed this season and it was oiled...any ideas??
Your heating service technician will probably check for a humming relay, control, electric motor, or burner motor. I'd turn off the system while waiting, in case it's an electric motor that is jammed or stuck.
I'm not sure what's going on but I'd start with the most dangerous: checking that the BANG! is not coming from the oil burner itself.
See PUFFBACKS, OIL BURNER to rule out that hazard.
Anon: trickling water means there's probably air in the hot water heating system piping. See our air-bound heating system diagnosis and repair articles in the links below.
I'd try to track the noise to location as well as by whether or not equipment is running or not. It could be an expansion/contraction of piping moving through a tight opening as temperatures change.
Louder sqeaks and shrieks are often a failed or failing motor or pump bearing.
Continue reading at CIRCULATOR OPERATION CHECKS or select a topic from the More Reading links shown below.
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