Fraiser Johnston furnace problem

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Old 02-05-13, 05:44 PM
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Unhappy Fraiser Johnston furnace problem

i have a similar problem with my Fraser Johnston furnace. I can light the other 3 burners with a long lighter, they will stay on for about 3 minutes, the go out again. I figure that gas pressure must be ok if they light. and burners might light if i clean them, but why wont they stay on? i did clean the flame sensor.
 
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Old 02-05-13, 06:19 PM
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Presuming this furnace to be vented with plastic pipe, if it runs 3 minutes before shutting down you likely have a condensate drainage issue. Remove the condensate trap & flush with HOT water. While the trap is out, check the drain line for blockages.
 
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Old 02-05-13, 07:33 PM
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If it's a drainage problem, the pressure switch would be opening. I'd start by using a multimeter to see if the pressure switch IS opening and shutting off the burners.

If it isn't I'd use the multimeter to see if the limit switch is opening and shutting off the burners.
 
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