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Reznor F75 Garage Heater won't shut off

7K views 3 replies 3 participants last post by  unicursalhex 
#1 ·
:cursing: I have a Reznor F75 garage heater that will not turn off. I replaced the thermostat and I'm thinking that the relay was burnt shut after the earlier thermostat failed. Any suggestions? Is this difficult to fix?
 
#2 ·
Is it firing? or is it the blower that won't turn off?

Open "high-limit" switch will make the blower run continuous and it won't fire.
 
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