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Old 02-20-2011, 02:10 PM   #1
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Reznor F75 Garage Heater won't shut off


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?

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Old 02-20-2011, 03:32 PM   #2
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Reznor F75 Garage Heater won't shut off


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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Old 02-20-2011, 06:01 PM   #3
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Reznor F75 Garage Heater won't shut off


The heater fires, but just keeps on running.
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Old 02-21-2011, 12:39 AM   #4
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Reznor F75 Garage Heater won't shut off


Maybe the wires are touching somewhere. Try disconnecting them from the unit and see if it stops running
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