Need HVAC help.

[harpo-my-“SON”Participant 2410]

Unit is less than three years old.
Solid state Honeywell thermostat lost
display.
I removed thermostat from mount and found
it had no batteries but a place for two AA
type batteries.
Put two new batteries in and the display looks fine
but unit will not come on in any mode. Heat or cool
It is a natural gas furnace and air conditioner made by CARRIER.

I noticed that the thermostat had nine (9) pins
The mount that it snaps into says the pin labeled
(C) was optional with batteries.
Since there were no batteries when I took it off the wall and it was working fine, Suggested pin (C) supplied DC current back to the thermostat.
A small blue wire was attached to pin (C)
I traced that wire back to the unit circuit board and
found it attached to a terminal labeled 24v.

I have tested the main power into both the inside and outside units. They both have power.
The unit will not come on even in fan only mode.
No Heat or Cool.

Strapped for cash and sure it is something simple
I am overlooking.

Any assistance would be greatly appreciated!!

For now I am going with my gut feeling and heading to the Honeywell website listed and will call their 1-800
number.

Thanks ahead for any help!

love and respect to all

I was bound to be misunderstood, and I laugh at those who misunderstand me. Kind mockery at the well intentioned, but unfettered cruelty towards those would be prison guards of my creative possibilities. This so as to learn as much from misunderstanding as from understanding. Taking pleasure in worthy opponents and making language fluid and flowing like a river yet pointed and precise as a dagger. Contradicts the socialistic purpose of language and makes for a wonderful linguistic dance, A verbal martial art with constant parries that hone the weapon that is the two edged sword of my mouth.

[hmskl’dParticipant 6406]

Something such as dirty air filter restricting flow can cause unit trip .. be sure to replace air filter to allow required airflow. I change filter every four weeks during winter.

Did you have a lightning storm?

Lightning can trip breaker. My DSL phone splitter in the outdoor wall service box blows so often that last year alone, I went through four or five of them. I keep about six on hand to replace .. and don’t even try and notify phone company anymore when line goes dead. I also lose about half a dozen phone surge protectors per year inside the house. About every other nearby thunderstorm sends a surge in. The joys of living on top of a hill with lightning .. and at the very end of the phone line .. even though it’s buried .. I still absorb the “best” surges.

Often, just the phone side of splitter blows and I still have useable DSL. Phone company says it’s just as easy to replace splitters as to put surge protection ahead of it and replace that every time. Have cellphone but limited sources for web without DSL .. someday I’ll get rid of phone line altogether. Landline is a real pain. I have a whole house AC protector at the breaker panel.

After changing air filter. Carefully check breaker panel in house to see if one marked furnace has tripped. If breaker is still on or has now been re-set …
Then, you can go to furnace .. there is an electrical switch mounted somewhere on “outside” of furnace near access door. Looks like a normal light switch. Turn that switch off and wait about three minutes .. a few minutes. Turn switch back on and then after a few minutes .. you can tell if system has been re-set and working.

The times my Carrier didn’t re-set .. was when it had a failed igniter .. and the other was when the condensate drain collector was plugged and needed to be opened.

[WallyParticipant]

This may help,

https://dengarden.com/appliances/Flashing-Red-Light-What-Your-Furnace-Is-Trying-To-Tell-You

To diagnose your problem

Some friends and I were talking about this the other day with one being a HVAC tech.

"what a waste of a life, to marry, give up your freedom, just for the hope of not dying alone. Don't get married Son."

[Secret Agent MGTOWParticipant 22510]

Sometimes the themostat unit fails and you need to get a new one.

Sometimes the physical connections between the thermostat unit and the hvac unit get disrupted.

Check the base the thermostat unit pops/snaps into, the wires underneath going to the hvac unit may be loose or broken. Clean the metal conection areas on the thermostat unit where it clicks into its housing. Sometimes dust builds up between the thermostat unit and its base and esentially stops signals going from the thermostat to the hvac.

Women want everything, but want responsibility and accountability for nothing.

[Anonymous 7]

I know this seems like a no brainer but does your furnace have all the panels on? Your furnace has an interlock that cuts power when the blower compartment panel is removed.

Either way the T-Stat losing the display until you put in batteries suggests your furnace does not have power for whatever reason. Hmskld gave some good troubleshooting tips.

[Anonymous 43]

There is a guy who claims to work on HVAC…dodgy kinda guy. Ill send him a pm.

[Gravel PitParticipant]

Anonymous wrote:

claims to work on HVAC…dodgy kinda guy. Ill send him a pm.

Sounds like 99% of AC repairmen lol. Damn near autistic, totally unsocial, reek of tobacco or hangover, but are genius when it comes to knowledge of AC system.

[Anonymous 43]

yeah, this guy has the shakes, and he uses a lot of duck tape, says sheet metal screws are the devil.

But he’ll work expensively.

[Anonymous 7]

Anonymous wrote:

says sheet metal screws are the devil.

LOL! I use to do HVAC work. I was never very good at the residential stuff. I was much better at cold beverage machines.

Dodgy and shaky, sounds just like me. 🙂

And yes, sheet metal screws are the devil.

[Anonymous 43]

I wonder what the mileage upcharge will be from the sex addiction clinic to harpo’s house will be?

Sex Addiction & Sexual Disorders Treatment Program

He sent me a postcard from here a couple days ago. He said they use “Hammer the Peg” technique…something new from the UK. I have heard this was a good way.

[Anonymous 42]

Those pins are sometimes the problem, mine took a little wiggling and pressing at the same time to make a sufficient contact, sounds like the unit ran off the heating system’s 24v transformer and the batteries shouldn’t effect it unless they’re being delivered 24v somehow, in which case you’ll know when they explode! I’m betting the porcupine terminal has a loose quill.

[harpo-my-“SON”Participant 2410]

You guys are always good for a laugh.
Yes Gru I put tape on the door relay switch
turned the unit on with fan on and nothing
at the unit happened. although the thermostat
does click.

I obtained a better test meter and found the thermostat is not sending signal to the fan motor.
Finally had to jump power to the motor and it will run
without hand turning it.
This eliminated the possibility of bad capacitor or
motor itself.

I believe It has to be a bad circuit board or bad thermostat.

Did have lightning storm but power is getting to unit.
Breakers are good. Not tripped.

When I put batteries in the thermostat it has display
on or off the wall and clicks when fan is turned on.

without batteries it has nothing.
testing the pins with meter shows no voltage
Shorting “R” to the “G” terminal should start fan
even without thermostat. Does nothing, making me think it could be a bad circuit board.

MGtower no loose quill. Only 7 of the 9 pins are being used and TWO of them are jumpered so act as one they are the power supply to the others. Terminals are as follows “R” and “RC” is jumpered and supply 24v to others as needed.
“Y” terminal is compressor so setting thermostat
to cool should send 24v through that wire.
this should turn on outside compressor and outside fan motor as well as blower motor inside air circulation unit. Blower motor is on the “G” terminal and is energized with 24v in heat or cool setting or just fan only mode.
“W” is for the furnace.
“C” is called COMMON and is used to hardwire
thermostat to house power and have no need for batteries. (this is the way it was installed)
terminal “C” says optional with batteries.
“O/B” terminal is for a reversing valve.
(not knowledgeable about this pin yet)
The other two pins are not used for my unit
although I do know they are for second stage heating and cooling. Low fire to high fire heating and multi stage compressors.

R= power
RC= power jumped to R
Y= cooling
W=heating
C= common used to hardwire thermostat to house ac
O/B= reversing valve ? ? ?
G= blower fan
Y2=second stage cooling (NA) not used on my unit
W2=second stage heating (NA) ”

Maybe I should just find a trade school and take HVAC
HA! HA! HA!

Called the company that installed it and all parts are still warrantied. 5 years so no cost for parts.

weekend service calls are 149$ weekdays 69$

Hate that I will be at work when they come tomorrow
would love to get in the way and ask some stupid questions.

Thanks guys. I do love you all

I was bound to be misunderstood, and I laugh at those who misunderstand me. Kind mockery at the well intentioned, but unfettered cruelty towards those would be prison guards of my creative possibilities. This so as to learn as much from misunderstanding as from understanding. Taking pleasure in worthy opponents and making language fluid and flowing like a river yet pointed and precise as a dagger. Contradicts the socialistic purpose of language and makes for a wonderful linguistic dance, A verbal martial art with constant parries that hone the weapon that is the two edged sword of my mouth.

[harpo-my-“SON”Participant 2410]

May 7 wrote:I wonder what the mileage upcharge will be from the sex addiction clinic to harpo’s house will be?

If MAY 7 sends a sex addict to my home we are gonna have problems HA! HA!

I was bound to be misunderstood, and I laugh at those who misunderstand me. Kind mockery at the well intentioned, but unfettered cruelty towards those would be prison guards of my creative possibilities. This so as to learn as much from misunderstanding as from understanding. Taking pleasure in worthy opponents and making language fluid and flowing like a river yet pointed and precise as a dagger. Contradicts the socialistic purpose of language and makes for a wonderful linguistic dance, A verbal martial art with constant parries that hone the weapon that is the two edged sword of my mouth.

[Author]

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