intermittent firing

ty_3

Could thermostat cause a symptom like this?
BTW, where is the low limit?

ty_3

burnham series 2 model B boiler

boiler shuts off about 120 deg. regardless where the high limit is set.
it will not stay fired to reach 180 but will cycle on and off and stay at 120

Weezbo

sounds like it is bouncing off the low limit.

ty_3

problem seems to be the incorrect anticipation setting on thermostat

Bill_49

Anyone have an answer

Intresting, does anyone out there have an answer.

Bill

Bill_49

Anyone out there

Can't anyone solve this problem, I remember when this site would reply in hours.

Bill

Joe Brix

Well, Bill....

....I doubt that this problem is solvable without being there at the boiler with a test meter to determine why it is cycling the way you have described. Too many possible causes to diagnose in cyberspace!

Starch

Bill_49

John thanks for your reply

My question is about the boiler, I had the same problem described above. This is not my orginal post.

I had the same problem, no water leaking the pressure holding and the water temp never got over 120 degrees.
I call a heating contractor and he replaced the boiler. It was a 42,000 btu with a thermocouple for ignition.

The boiler is setting in my basement and he didn't know what the problem was, so when I see a post about this problem it must be common. Could it be the aquastat or the gas valve. The high limit switch is in the aquastat, no low water leaking the pressure is holding.

How common is this Problem, any answers out there.

Thanks Bill

ty_3

I seem to have had a incorrect anticipation setting as the problem seems to be resolved after adjusting

Bill_49

Robert thanks for the reply

I had a honneywell Programable thermostat.

Thanks Bill

Steve_35

Not enough information

Is there voltage to B1-B2?

Is the high limit open or closed?

Is there still a verified call for heat?

You need to get your DMM out and gather some information. That will quickly tell you where the problem lies.