reznor f50


Old 10-07-19, 05:40 PM
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reznor f50

I have reznor f50 the pilot light lights well as I just changed the thermocouple but when turn the furnace to on it runs for about a minute till it gets hot the fan starts and runs for a minute then everything goes out the furnace and the pilot would it be the flame sensor
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Old 10-07-19, 06:06 PM
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Welcome to the forums.

If both the pilot and the burner go out..... that would still point to a thermocouple issue.
The thermocouples job is to keep the pilot lit. Once the pilot is lit..... the burner is lit.

However..... the F series is shown as using an intermittent pilot....... not a standing pilot.
Maybe there is more than f50 in the model number ?

Reznor F series heaters (pdf)
Old 10-09-19, 06:35 PM
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Thanks there is nothing other than the f 50 in the model number the furnace was working fine a couple weeks ago then started this just shutting down tested thermocouple and was low so replaced with new one pilot lights a lot faster then before and will run until thermostat turned up then burners start up and runs for few minutes then everything shuts down and have to relight everything

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