Furnace going into lock out
Our 2013 cougar has a Suburban SF-30FQ furnace that intermittently locks out.
The furnace always ignites correctly ie the fan starts and runs for 15 seconds and then ignites and makes good heat however it occasionally stops as if the overheat limit switch has tripped the furnace stops and remains inop until its switched off and restarted.
The return air is clear, the air ducts are not restricted and the exterior intake and exhaust is not restricted.
The overheat limit switch connections are good and the switch has zero resistance cold.
Im suspecting a faulty high temp limit switch but open to any ideas
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2013 Cougar 331MKS
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