Hello everyone.
I have a 10-year old oil-fired boiler for hot water baseboards (and domestic hot water via coil). We had to replace the aquastat last winter with an entirely different model (Honeywell L7224U). Since then, I've noticed it short cycling multiple times a day (only for heat, never hot water). The company that changed the aquastat has been out several times to diagnose, and can't seem to find anything amiss. Hoping someone here might have an idea.
I'm defining short-cycling as less than a minute. Sometimes it only runs as little as 10-15 seconds.
Boiler high is set to 180, low to 160. Both diffs are set to 10. Our house is one-level, 1300 sq ft, and has 3 zones on the main floor. Thermostats are Honeywell programmables, all set to hot water boiler (not steam) in the settings. I can't seem to adjust the swing on this model, but they're all installed on interior walls and away from windows/doors.
The short cycles always occur in the same manner: no zones are calling for heat, circulator is off, and the boiler temp is in the 168-170 range when it shuts down. I'd estimate it does this maybe 1 in 10-15 cycles. A normal runtime is about 5-8 minutes.
Thank you for reading, and any and all thoughts are appreciated.
I have a 10-year old oil-fired boiler for hot water baseboards (and domestic hot water via coil). We had to replace the aquastat last winter with an entirely different model (Honeywell L7224U). Since then, I've noticed it short cycling multiple times a day (only for heat, never hot water). The company that changed the aquastat has been out several times to diagnose, and can't seem to find anything amiss. Hoping someone here might have an idea.
I'm defining short-cycling as less than a minute. Sometimes it only runs as little as 10-15 seconds.
Boiler high is set to 180, low to 160. Both diffs are set to 10. Our house is one-level, 1300 sq ft, and has 3 zones on the main floor. Thermostats are Honeywell programmables, all set to hot water boiler (not steam) in the settings. I can't seem to adjust the swing on this model, but they're all installed on interior walls and away from windows/doors.
The short cycles always occur in the same manner: no zones are calling for heat, circulator is off, and the boiler temp is in the 168-170 range when it shuts down. I'd estimate it does this maybe 1 in 10-15 cycles. A normal runtime is about 5-8 minutes.
Thank you for reading, and any and all thoughts are appreciated.