boiler won't stop running

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  #1  
Old 02-08-08, 06:53 PM
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boiler won't stop running

so i have a boiler that is connected to a new thermostat. regardless of whether the thermostat is "on" or "off" the boiler is just roaring. the only way to turn it off is the manually turn off the boiler with the emergency shut off switch.

interesting note, even when the wires were not connected to the thermostat, the boiler would still fire up and warm up the room.

bad wiring? if so where? any thoughts suggestions?
 
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Old 02-08-08, 07:04 PM
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Was the thermostat replaced as an effort to fix this problem ?

or

Did the problem show up only after the thermostat was changed ?

What model of boiler ? Gas fired ? Oil fired ?

Is the system ZONED ? i.e. more than one thermostat ?

Do you know where the 'aquastat' is on your boiler ?
 

Last edited by NJT; 02-09-08 at 06:46 AM.
  #3  
Old 02-08-08, 07:13 PM
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Originally Posted by whataboutjonlee View Post
so i have a boiler that is connected to a new thermostat. regardless of whether the thermostat is "on" or "off" the boiler is just roaring. the only way to turn it off is the manually turn off the boiler with the emergency shut off switch.

interesting note, even when the wires were not connected to the thermostat, the boiler would still fire up and warm up the room.

bad wiring? if so where? any thoughts suggestions?
How many zones? Does each zone have it's own thermostat?
 
  #4  
Old 02-08-08, 08:56 PM
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problem occurred before new thermostat was installed, i thought perhaps it was the thermostat.

just 1 zone heating, no cooling

i believe the boiler is a burnham

i bought a condo that was converted from two apartments into one. therefore i have 2 boilers for each floor. don't necessarily use the basement that often other than that sleep, and it's been a mild winter so it' hasn't been too bad, but i have the mother in law staying with us this wknd, and thought i would try to make it as comfortable for her as possible.

any thoughts?
 
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Old 02-09-08, 05:17 AM
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Does the circulator pump run at all? If the pump is running, then the boiler is seeing a heat call. If the pump isn't running, then the boiler might be trying to reach it's minimum aquastat low limit. That might indicate a stuck flow check valve, or opened flow check valve, that is allowing gravity circulation.

If you have a Zone Valve (which I wouldn't expect on a single zone system) it could be stuck open, and holding the limit switch closed generating the heat call.

Pete
 
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Old 02-09-08, 06:47 AM
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Do you know where the 'aquastat' is on your boiler ?
 
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Old 02-09-08, 07:55 AM
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i have no idea where the aquastat is located, and i believe the circulator is running as well.

the boiler works fun, it produces heat, but i can't seem to regulate it other than turning off the emergency burner switch and turning it back on.
 
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Old 02-09-08, 08:03 AM
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In that case, the best advice would be to call a qualified technician to check things out.
 
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