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Yes, it was a limit switch exactly like one shown on link in C2F's reply above. So what are possibilities that could trip this switch? crack in heat exchanger is mentioned...would electrical power outages cause it? It has been sitting dormant for years and always worked before this last start up.

yes, limiter valve.

Found the problem with help of electrician friend. Some one on this Forum suggesting checking "limiter valve" on top of Modine. There was a reset button there. Once pressed, the burners fired up. Problem solved. Thanks for all your suggestions. For my knowledge...what would cause this limiter to...

Hi all: I am new to this forum. Hope you can help me. I have a 10 year old Modine ceiling heater (60,000btu I believe)in my 30x30 garage that won't fire when heat is called for. It is propane gas fed. Hasn't been used for several years but always worked fine. The propane guy said the pilot...