More HVAC problems

[bellicose]

I didn't want to take over Brandon's HVAC post, but I am also having problems. My bill was very high the past few months, and I was out in the garage and may have figured out why. It makes a whirrr sound like it is starting to come on, and then click, turns off. This process repeats over and over. I'm not sure how long it takes to actually start up, but it's a while. Here is a link to a video so you can hear it yourself. Do I need to get an HVAC company out here to fix it?

https://photos.app.goo.gl/6eAqZ5cvfu9YLHa18

[BrickHaus]

I cant hear the video well, but it sounds like your furnace or heat pump is failing to ignite or failing to sense flame after ignition.

Ive had a few gas water heater that faulted to a similar cycle. It ended up having an oxidized flame sensor.

The bright side is, if this is the case. You can likely get the flame sensor out, clean it carefully with steel wool, and buy another 6 or so months.

From a quick google search, the honeywell module you shared isn't faulting out, but its simply a master device telling the zone 1 furnace to run. . Where is the actual furnace that module is calling, it may have a
fault light on it that after so many failed ignition should give a fault code of some fashion. The code will narrow your troubleshooting.

[bellicose]

You've given me something to look for, thanks. Next time I catch it, I'll look to see what the fault light is doing.

[BrickHaus]

Okay watched the video again while not in a car. That short cycle on the fan makes me think the fan limit switch is possibly faulty. A flame sensor would allow the ignition flame to run a few seconds before faulting. That almost shuts back off as soon as the fans get up to speed. Doesn't even sound like its getting to the ignition part of the cycle.

But the light codes will give you an idea regardless.

[bellicose]

That makes sense.