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I would verify there is a signal to W on the furnace even though the stat says it is on.

Manual dampers in the supply, what floor is the stat on ? May need to use remote sensors that can average the temps from both floors, constant fan may help in moving the Btu's around.

I always thought ventless types were a bad idea.

Maintenance call may be wise to check it all out and to get more familiar with what you got and how to operate it, since it is all new to you.:.02:

Model an serial numbers on all, plus a a little more diagnostic info is in order first.

Agree very cheap insurance, i always had a stock of the add on, wrap around, universal types, self regulating types in the truck.

At 22 years old , do you have it serviced yearly? could be other issues causing your problem.

Pizza places are notorious for having alot of flying flour and things in the air , have your service people check all air moving equipment and clean as needed.

Is the MAU using gas for fuel? And do each units have a gas fireplace? I have seen condos where the gas is on a common meter and during the winter, the fire places are on and drives up usage.

When is the last time you made it underneath and checked for torn up duct work?

Probably covered in lint now.

Maybe in lockout and ur just resetting it?

As said above,verify temp in and out over the indoor coil and also the return temp at the return grills and then at the return of the coil. Are you sure the outdoor unit is running and producing heat...

The Stay Brite specs tell the tale. Never leave home without it.

Wait till the heat exchanger fails, as they will in that date range, put your money into a new furnace. There is plenty of reading on carriers older 90 s lawsuits.

Verify gas quality and pressure first, pilots cleaned, i guess you could just have worn out valves but i would start at the beginning points first. At least new valves or at least one would be handy...

So the white wire is shorted somewhere? i would pull up a chair and run it thru all cycles a couple times.

Bring in all the rats that know what happened, the ones hiding behind absolute immunity if you want to get pass here say, Doubt they will tell the truth, but i think they know the story.

That old of air handler should be replaced, but it should be easy to trouble shoot. Leave one lead on xfmr common and use the other to follow the circuit around.

Is that a danfoss valve brazed onto the dist body and the real skinny cap tube line to bulb?

Start asking friends or neighbors for recommendations on hvac co. Your power provider may have a list of approved contractors.

Get a meter on it.

Hopefully someone balanced them when they were installed, if no verification, that would be a good place to start along with having the econos checked.

Well if you look at the first pic you will see oil stain on the end of the copper, on the end of support leg and on the ground all in the vicinity of the discharge pipe. That is where i would start...

Was it air balanced or proof of correct amount of airflow.

Is there a cap on the bottom of the tee?

Checked gas pressure thru all operations?

Get a HW vision pro, it will be able to be used on any upgrade of the system in the future.

Does have oil staining on the piping end and under it. Get the electronic sniffer out.

Is the econ min position set to be open too much possibly. Sounds like maybe all programming needs to be gone thru.

Does it have fire dampers that could have shut down ?

The reason i asked is i just put in a model CH16b24 that the inverter driven comp has a ringing sound when it gets up to full speed. I just have not checked out what it is yet

Inverter type odu?

Agree above, but i would of thought even at that pressure for those days something should show up. Hopefully a new drier and nitrogen flush while brazing was done. Did you see this work being done?

It was used when you did not have enough wires when you add AC and needed the extra wire for cooling. Find a older tech who knows how to fish wiring and run new wire to stat, 18/10 for all your...

Your tech needs to look a little harder. And there is a lot of ways to find leaks beyond checks the coil and electronic tests.

Sounds like Tranes inducers that ran like that, on the older Voyagers.

I would also add to verify heat exchanger is good, gas pressure check as said above, and put a amp clamp on the HSI while energized, you can have a small crack that will get warm but not ignite. If...

Cow bells.

Its a 240 volt motor so you will have 120 to each wire. Not a DIY site.

Correct setpoints and verify readings from sensors, proper maint and owner training.

Great work!

And have them put the model numbers of proposed equip on the quote to verify what you are going to get and that its a match for efficiency ratings.

And what does your multimeter tell you?

Her husband is a real class act, while the fun was going on he was no problem, then when kicked to the curb he is butt hurt. Granted, if you have nude pics out there they should be more secure, but...

Do not hear much on the payoffs to the girls, cohen , even the kids and other family members are laying low. Congress needs to grow a set and realize he is not King or the Don of this country.

Use the OEM motor , plenty of places to buy it.

What about a electronic air cleaner, have one of those or a crawl space with unsealed ducts? And where is the condensate drain draining at.

Have you got a quality CO alarm inside. From my chair sounds like a CO leak.

No the oem rating switch should be used.