Burners Go Out After 7 Seconds and It's Not The Flame Sensor EP175

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In this video I came across this old Lennox gas fired furnace that would not stay lit. After cleaning the flame sensor it still wouldn't stay lit. Turns out it had a faulty pressure switch. I'll show you how I tested to verify this issue. I also will show you how to install a universal pressure switch.
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Опубликовано:

12 май 2024

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Комментарии : 17

@tonydelgrego2906 3 месяца назад

Nice professional troubleshooting and repair. Nice job

@stevencossaboon3237 3 месяца назад

Nice work Nighthawk.

@s.j.5850 3 месяца назад

Enjoyed your troubleshooting. I have an older Lennox model air-handler so your tips will come in handy.

@user-rs7yf4pe9s 3 месяца назад

I'm an apprentice appreciate these type of videos thanks! 🙏

@my-yt-inputs2580 3 месяца назад

I had almost the exact same thing happening to my gas pack pack in January of this year. And of course it happened during an extreme cold snap. Less than 10 degrees. Burners would stay lit for about 8 to 10 seconds. Inducer motor would shut off then immediately start again and the cycle would continue. After it cycled that way a number of times the system would reset and shut off completely. Turned out it wasn't the flame sensor itself but the ground bond between the flame sensor mount and the unit frame. I had to take a wire brush to the flame sensor mount bracket as well the the unit frame where it attached to help with the bond. Although not sure why the sensor mount bracket needs to be grounded that way since the tip is isolated from the frame by the ceramic. But that fixed the issue completely.

@gingerstrand6153 3 месяца назад

Great video! I've always felt Lennox was over engineered. Just my opinion.

@Scott-hb8pu 3 месяца назад

Nice vdrums

@waynetirrell2358 3 месяца назад

Great Video and diagnosis! I wonder, would you be able to clean the flame sensor in place, after you had removed the burners? Sometimes that can work

@deanmartin1966 3 месяца назад

Nice job

@beerbrewer7372 3 месяца назад

Nice video. Where there any codes on the control board?

@NighthawkHVAC 3 месяца назад

Nope

@jerziballer24 3 месяца назад

Pressure swith

@garymartin9665 3 месяца назад

What's your take on the soft starter

@MikeSmith-gi8fu 3 месяца назад

Wouldn't it make more sense,instead of pulling that sensor, to test it?

@NighthawkHVAC 3 месяца назад

Probably, but if it test bad I would have had to take it apart. Plus it needed to be cleaned anyway.

@throttlebottle5906 2 месяца назад

umm, that's not how you adjust a universal pressure switch. you need a manometer, pump with bleeder Y and meter to adjust them to exactly the correct pressure of the switch you're replacing. also "tilting" that universal switch at any angle or position shouldn't change the set pressure, that's happening because it's way under adjusted with spring very loose flopping around. you often need the orifices to slow the flow so the switches don't bounce on burner ignition, which is usually on dual hose setups where they have a bleeder port(match the old switch) some companies have combo manometers, pump, testers to set them. not trying to be a know it all, just letting you that's not right.