Forum Discussion
Old-Biscuit
Mar 24, 2016Explorer III
Do you get roughly same air flow out ot all the ducts?
Crushed flex ducting?
Anything surrounding furnace that would restrict air return flow?
You are hitting the high limit so flame goes out then back on then out (repeat) and fan continues to run,,,,,,so something is restricting the amount of air flow (return and/or discharge)
20K BTU furnace is small for that size TT BUT it would eventually get to t-stat set point over time but can't due to high limit switch opening/closing.
Restricted air flow -----somewhere
Crushed flex ducting?
Anything surrounding furnace that would restrict air return flow?
You are hitting the high limit so flame goes out then back on then out (repeat) and fan continues to run,,,,,,so something is restricting the amount of air flow (return and/or discharge)
20K BTU furnace is small for that size TT BUT it would eventually get to t-stat set point over time but can't due to high limit switch opening/closing.
Restricted air flow -----somewhere
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