Upon arrival found indoor blower running even with no call for heat. Upon further inspection found roll out limit to right hand side of burner assembly open as well as an open high limit.
Reset all,i it’s and cycled power. Furnace completes sequence of operation runs for about 10 to 15 ,imputes and shuts off. Tested gas pressures and they are within proper specs. Also tested blower motor and inducer amps and they are ok.
Found very dirty air filter attributing to air flow restrictions. When filter is removed furnace continues to over heat heat exchanger.
Suspected dirty plugged up coil as well as dirty duct work.
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