Questions tagged [hvac]

(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

Filter by
Sorted by
Tagged with
0
votes
2answers
27 views

Forced-air heater for old floor registers

I have an older home which used to be centrally heated by a furnace in the crawlspace, but has since been retrofitted with forced-air wall heaters: Some of the wall heaters are in inconvenient ...
0
votes
1answer
52 views

Half of furnace turned off?

I moved into this house about 10 years ago, I noticed on the furnace that one of the breakers for the electric coils is off with a note saying "Leave breaker off". After cleaning out the blower for ...
1
vote
2answers
71 views

Furnace continously shutting down due to lost or low flame sense (Rheem)

My furnace will run great for most of its cycle, but when it has almost reached the thermostat setting, I will hear it shut off, run the blower, then re-light. It will sometimes finally reach ...
0
votes
2answers
1k views

how to bypass an HVAC unit float switch (safe-t-switch)

rats keep chewing through the safe-t-switch wires even when I taped them up heavy. before I get rid of all rats I need to just bypass the float switch. at least then I can use the heat while I'm home.
0
votes
2answers
103 views

Goodman furnace flames out after 5 mins from cold start

Problem with Goodman Furnace flaming out. After it has been off for about an hour it will flame out after it starts and runs for 5-10 min before it satisfies themo setting. Restarts and finishes cycle....
0
votes
0answers
26 views

Nest E without common wire stuck in purge loop as soon as the Rheem heat furnace ignites

I have a honeywell hz432 and just installed a few NEST thermostats with a common wire and they seem to run fine. I added another NEST E thermostat, but this one didn't have a common wire, and when it ...
0
votes
0answers
27 views

hvac fan won't stop

My Hvac fan won't stop even after the desired heat is reached after the gas burning stops. I changed the furnace limit switch, no difference. Today I noticed there is an auxiliary limit switch on top ...
0
votes
2answers
70 views

Replacement draft inducer motor stopped working after 3 months

My Goodman GMNT060-3 furnace stopped turning on in October. The tech diagnosed a bad draft inducer motor, because the fan wouldn't spin freely and made a grinding noise when turned by hand. I replaced ...
1
vote
2answers
75 views

Ecobee install with AC system disconnected

My house which was purchased from a bank (foreclosure) was originally wired with both central air and heater (forced air). But when the previous owner left, he took the air conditioning unit. The ...
0
votes
1answer
69 views

HVAC York diamond 80 furnace A/C

So I have a York diamond 80 furnace and the motherboard burned out so Lowe’s came and replaced it. I’ve been using the heater because it’s winter right now but the other day I accidentally hit the ...
0
votes
4answers
90 views

Goodman Furnace short cycling because of high limit . Cant figure out why?

So just had a Brand new Goodman furnace and a/c installed before winter hit. As soon as heating season started i noticed it was short cycling and had a flash code of 4. I contacted the installer and ...
0
votes
1answer
42 views

High Limit Switch

my fan for clearing residual gas comes on and continues to run without starting the furance. The circuit board is flashing 4 times which means bad high limit. I replaced with a new one, ran for a few ...
0
votes
1answer
50 views

Millivolt fireplace turns on by the thermostat but will not shutoff

I inherited a freestanding direct vent fireplace and I'm trying to get it to work with a thermostat. It functions fine using the ON/OFF/PILOT switch but will not work with a thermostat. It is a SIT ...
0
votes
2answers
30 views

How can I wire the Humistat and Humidifier so that Humudifier runs only during heat cycle?

I have Honeywell Humidifier HE225A, Honeywell Thermostat TH6110D and Honeywell Humidistat H8908B all installed already. Now my Humidifier runs 24/7 wasting water because it is connected with the ...
0
votes
1answer
263 views

C wire - thermostat - not providing power

I'm replacing my old Honeywell thermostat with a new Wifi thermostat. My old/current one is battery powered and doesn't use the C wire. I found the C wire behind the plate. I connected the c wire to ...
0
votes
1answer
16 views

New Thermostat Won't Engage Plinth Heating in Kitchen Island

I have two plinth heaters on either side of my kitchen island. Since the rest of the house is hydronic, I presume that these are hydronic (there is a zone valve at the boiler) with electric fans ...
0
votes
0answers
13 views

I installed a honeywell WiFi thermostat, the primary heat runs the heat pump instead oh the gas furnace

I want to run the gas furnace, but the primary heat turns on the heat pump. If I turn up the thermostat several degrees, then the gas furnace comes on . In emergency settings, nothing happens. How do ...
0
votes
0answers
25 views

Gas Furnace Creaks When The Wind Blows

I have a Williams Forsaire Top Vent‎ gas furnace that creaks when a strong gust of wind blows. Could the venting be loose or not fitting right? Any ideas?
1
vote
1answer
968 views

Are these red lights on my Honeywell HZ432 why my bedroom isn't blowing in heat?

I just moved into a new multi-family house with central heat/AC and the 3rd floor bedroom doesn't seem to warm up very well. When the thermostat is on, I don't feel hot air blowing in from the vents ...
0
votes
1answer
21 views

Central heat doesn't always kick back on

I have a York stellar forced hot air natural gas central heat. Many times if the thermostat is set to say 70 it will turn off after reaching that temp but then wont always kick back on when it drops ...
0
votes
2answers
52 views

Upstairs room too hot - can I install a room-to-room fan to blow hot air back into the high-ceiling living room? [closed]

I'm in a narrow, vertical, townhouse style three story house. My upstairs bedroom gets too hot, and downstairs gets too cold. I found I could fix the downstairs problem by running the HVAC fan full ...
0
votes
3answers
52 views

Furnace won't start

I have a Goodman two-stage furnace that won't start. Model # GMV950905DXA It was running two days ago and then stopped. Outdoor temperature is now -20 and will drop to -34 tonight. LP in tank is at ...
0
votes
0answers
19 views

HVAC unit keeps tripping breaker

had a short in the float switch wire( its all chewed up from rats) the short blew the 5A fuse . I spliced the wire and reattached it to its self in 3 places. this got it working but now its tripping ...
0
votes
0answers
27 views

Lennox G40UH furnace not turning on

With the lower panel door switch closed, the combustion air inducer comes on. It runs for a little while and then shuts down. Nothing happens in the meantime. The system was working fine until this ...
2
votes
1answer
251 views

Do I need to insulate both hoses on a portable AC?

Dual hose AC portable systems have an exhaust and intake hose. The exhaust hose gets tremendously hot, and obviously it helps if it is insulated. What about the intake hose, is it worth the cost to ...
0
votes
1answer
27 views

I have a 6" insulated duct what size t should I use?

I would like to know ,do I use a 6" insulated duct to a 6" register?
0
votes
1answer
46 views

what size wire is a float switch for a HVAC unit

I need to cut out the existing wire and splice on new wire since the insulation is torn up beyond repair (shorted out the 5A fuse) , obviously a Temp repair until the part can be ordered
1
vote
1answer
31 views

Swapping to Hive thermostat. 4 wire communicator has 2 wires per post

I'd previously asked if I could swap my wires from the 4 wire communicator to the larger board and was told I could. I finally found time to do it. However, as I was preparing to move the wires, I ...
0
votes
0answers
22 views

Put media filter in place of electronic air filter

I have a trion iaq 1400 electronic air filter in my house. I decided to take the filters out and replace them with a 5 inch media filter. My problem is that there is a small space between the filter ...
0
votes
0answers
10 views

Furnace will heat up to set temperature. Cycles off. Then won't restart once below the setting

So the furnace will be on for as long as it needs to get the temperature up to the set temperature (Has been going for 30 minutes now). It will then turn off, but won't turn back on when the ...
0
votes
1answer
17 views

How to electrically hook up my humidifier to my furnace and have it run when furnace is running and not A/C in summer

How do I hook up my humidifier to my furnace so it only runs when furnace heats my house. Just want to make sure it does not turn on when A/C in summer goes on. The person who installed my furnace ...
1
vote
1answer
46 views

Furnace Short Cycling

My furnace is short-cycling. I've tried the following: replaced the flame sensor Shorted the thermostat heat demand signal Checked the blower capacitor Checked the air intake filter Checked the ...
0
votes
0answers
830 views

Is it possible to run an HVAC duct through a floor joist?

i understand that the maximum size hole I can put through a 9" floor joist is 3". But if I add a 5" booster fan would it be possible to retain proper air flow and route this duct through the joist ...
3
votes
1answer
51 views

My induction blower never stops

My induction blower never stops. It was showing a code of pressure switch but if I turned off the main power and then back on it would reset and heat normally till it was up to temp then shut off and ...
1
vote
2answers
55 views

TRANE XE70 GAS FURNACE - HSI only works once

My TRANE XE70 Gas Heater ..... HSI will glow hot once and heater works fine but then doesn't work anymore on the Thermostat cycle. I've replaced Flame Sensor and HSI Module. My White-Rodgers Control ...
1
vote
1answer
28 views

Heil gas Furnace — water in the pressure switch vacuum hose

Every few days I have to remove and drain the the rubber tube from the pressure switch to the furnace or it won't ignite. Why is water condensing in that tube? It's not a hard thing to fix-- but I ...
1
vote
1answer
138 views

How to connect c-wire to Burnham Series 2 boiler?

I am trying to install my ecobee 3 light but the previous thermostat did not use any c wire. Fortunately, there was an unused wire in the wall and I would like to set it up as a c-wire. The problem is ...
0
votes
1answer
104 views

How to improve heating/AC flow in second floor?

We moved into our house about a year ago and the second floor in my house never get enough heat in winter or cold AC in the summer. Our first floor can be a 72F deg while our upstair stays at nearly ...
1
vote
0answers
527 views

Daikin Mini Split Runs Constantly

We had a Daikin ductless system installed as a replacment for our old system that finally died. We have 4 total units inside the house, with 1 in each of the 3 upstairs bedrooms and a larger 18K BTU ...
0
votes
0answers
11 views

Oil furnace cmf280-pg convertible problems

Cmf2 80-po convertible with a auto limit switch and a manual aux limit switch. Furnace will run a heat cycle to desired temp but then blower fan runs to cool furnace in 4 very short 3 second spurts. ...
1
vote
2answers
36 views

Where should my furnace filter go in a Lennox G40UH24A045 series furnace (Merit)?

I cannot find the filter and my furnace is not providing any heat. The limit switch is working fine as is the flame sensor. Diagnostic lights are: 1 slow bling 2 on Any clues? Thanks
1
vote
1answer
68 views

Old thermostat to Hive thermostat

My wife decided we needed a smart thermostat... which means I need to install said thermostat... Currently a Bryant Evolution series is mounted. She purchased the Hive with Hub when it was on sale. ...
0
votes
0answers
17 views

how to communicate thermostat to turn on wood heat system when during heat pump defrost cycle

I have physically disconnected the strip heaters in my air handler but the fan still runs which I do not want. I have a wood boiler I want to run in place of the aux heat Can I disconnect the white ...
1
vote
1answer
60 views

How can I prevent makeup air vents from exhausting conditioned air?

The utility room has two 8-10 inch ducts running to it from the exterior of the home. There are also three fireplaces in the home, and we have noticed that occasionally the house smells like smoke, ...
1
vote
2answers
317 views

How do I install flex duct to existing duct including registers

When my home was built in 2016 the HVAC runs from the furnace in the basement up through the house uses 7" R4.2 insulated flex duct. I am in the process of finishing my basement and I would like to ...
0
votes
0answers
94 views

My furnace blower will not turn on when on when in E-heat mode with auto fan

I have an electric furnace Carrier model FB4ANF030. I enclosed the wiring diagram. Issue: The blower fan will not turn on automatically when the thermostat is set to "Emergency heat" and "Fan Auto". ...
0
votes
0answers
20 views

Hvac electric furnace Nordyne E1EH-012HA

I have a problem with Nordyne electric furnace with A/c coil above. It started the winter short cycling, then did nothing. I became a YouTube maniac trying to figure out the problem. I first replaced ...
0
votes
2answers
58 views

Tankless hot water to heat home

I have a 1200 square foot second floor apartment that is presently heated using a forced hot water radiator system. The system is called a Paloma "Paloma Pak" heating system. It is basically a ...
1
vote
0answers
50 views

Can I use an available wire as a C-wire by adding it to an unoccupied 24v terminal?

I want to add new thermostats in my home. Luckily, the wiring to my thermostat has an unused wire in the bundle for the required "C-Wire". It has R,G,Y,W, and an unused blue. The thermostat wiring ...
3
votes
1answer
49 views

Can't find HVAC C terminal

Could any of these be the c terminal on my hvac unit? There's already a c wire there, just can't figure out where to connect it.