Burners wonít come on


Old 10-20-19, 01:35 PM
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Burners wonít come on

Hi have a Burnham Gas boiler series 2a pilot light goes on but burners won’t so far changed gas valve ,thermo coupler , roll out switch ,damper and still not working thermostat works we bypassed it and still burners won’t come on has electricity going thru breaking our heads here what could it be??

Last edited by PJmax; 10-20-19 at 04:25 PM. Reason: removed link
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Old 10-20-19, 04:12 PM
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Don't throw any more parts at it without troubleshooting to identify the cause. If you have a multimeter (and know how to use it) and an electrical schematic for your system, trace out the wiring - start at the thermostat and work toward the gas valve, and find out where the 24-V is being lost. If this isn't something you can do, then call a pro whose references you've checked.

Good luck.
Old 10-20-19, 04:27 PM
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Welcome to the forums.,

There is no thermocouple on a intermittent ignition furnace.
Your problem is probably going to be the combination spark/flame sense rod.

There was a link in your post. Was that supposed to be to pictures ?
Old 10-20-19, 06:00 PM
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Yes did use multimeter traced out the wiring and the problem
from the transformer followed the wires to the damper to see if the damper is opening and it is checked and I bypassed the block vent switch and the burners came on so itís definitely the block vent switch tomorrow a licensed plumber is coming to change it and no worries boiler is off we have all over the home fire/carbon monoxide alarms and pilot is off thanks for your help
Old 10-20-19, 07:02 PM
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Plumber coming

Make sure the plumber checks your flue and chimney! There is usually a reason the blocked vent switch trips!
Old 10-20-19, 08:06 PM
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Is that for gas burners ? Check chimney and flue does that need cleaning ?

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