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All's good buddy.

sure you are not bypassing or recirc of the cond air?

My bet would be low on charge and yes that spot on the indoor coil looks like a leak spot. That should be easy to check.

Was it even properly started up and tested? If they say it was, ask for the start up sheet.

At 30 years old, i can only imagine what shape it is in.

Sounds like safety switch for the condensate system, but then again that is a guess from where i sit.

Most of carriers upper end zoning will not be able to just throw a t-stat on. It may be a zoning upgrade needed. Others on here will have more to say.

Properly clean OD coils first.

Hopefully it was a licensed tradesperson, seems like they will sell to anybody.

Pull the power to inducer while running in heat and verify it shuts down, if it does must be a pressure switch in it somewhere. At the least verify shut down on failed inducer!

Are flow controls on the water side installed and set correctly? Can you lower the loop temp down 5-10 deg temporary to see how the pressures look? 4-5 deg drop thru the water coil plus at 85 deg...

What does your installing contractor advise?

You need a good amp meter around the fused line and then start cycling all the components, if nothing shows a high amp draw, start looking at all the control wiring for chafing or bare spots.

As i remember you could pull the inducer motor and look thru to the ends of the secondarys.

At that age and design of furnace ,i would bet the secondary starting to plug up. Does the exhaust have a foul odor from it?

What does your meters tell you?

What maintenance would lead you to replace tank? Most larger ones have bladders that can be replaced, if needed.

Air bleeders piped to drains?

Does it have factory installed economizers?

I will second this, seen this a lot when charge is low.

replacing the unit is still cheaper than rotting out the pool structure.

Is the insulation old and brittle, may need to replace with a higher R rating and then a vapor shield over that.

Get a good stat, some utility providers offer rebates. Stay away from Nest, my choice is honeywell, all i have ever had for my own use.

Maybe just heat trace that downspout then, some models are made to drop down the pipe from the top and have a self regulating output along with a thermostat.

Either a grow room or Bitcoin mining. Heat trace the line, or open the window.

May start asking at the parts house, they seem to know all the gossip.

Run the heat pump.

A lot longer than that!

They also make boilers fueled by wood pellets, and models that burn firewood very efficiently.

I have seen a register in a floor boot float about a half inch up on a 5 ton 4 zone system. This zone only had 3 6 inch supplies. It was a carrier infinity system with out a bypass. You got any dogs...

Verify the indoor air supply is normal first.

I would throw the sizing on the companys giving you bids, although it may be hard to find one that does the extra work. I would ask them upfront what you expect. Most will just come out and get the...

Post the results.

Limits just work off of temp. If that's the right code, something is over temp or a bad limit switch. Is the blower fan running? If only running for 20 secs i would not think any limit would get that...

If you can post pics, someone on here will have worked on them. Also compressor tags can be a source of size for the cooling, Might be wise to pay or have a heat loss/gain done . At least you will...

May try google the wiring diagram number on the bottom of label also.

Most units have mod numbers inside the elec compartments for that reason.

Ya see that now, wonder how that drain under the slab was connected?

Whats the tan box on the wall with the drain on it, hopefully a trap primer for the floor drain. Maybe put a water sensor alarm by the drain if that is the low spot in house.

Have them put a trap on the cooling coil with a cleanout tee.

May be cheaper just to buy the whole assem, expose the duct work where it connects to, verify size, and turn off the power to it when replacing. It sounds like the gears inside maybe trashed, pull...

Looks like u have room to push up the dip in the pipe and see id water come out of the drain, usually on a problem like that i could hear the sloshing or the change in flow from the outside when...

Customers who hang of your shoulder.

Cold air coming thru wiring behind stat?

It is a troubling trend on here, of 2nd rate so called techs, being sent out to do service calls. Owners of these company's and in the end Mfgs need to step up on training and over site of what is...

I think a mini split offers a lot more benefits, the cost may be little higher, but the right model will support cooling at low OD temps, lower operating cost and a lot more protection, Window units,...

A ductless split would be the best option, something that would do low ambient cool control. Most units just use a 2 wire thermistor that i would just extend the wiring for it. Also make sure the fan...

Maybe escalate this above the contractor to a Amana rep, something sounds wrong with this whole scenario. Bypassing safety's is never approved and it would be wise to go above your contractor to help...

Starts with the owners of said company's, i guess if the money rolls in, a lot of them just bury their heads in the sand.

Like said before something wired wrong, pull wires off stat and unit, test unit as i said ,ohm stats wire to verify no continuity between them, if all that is good wire and set up stat correctly. If...