Join the 9 million people who found a smarter way to get Expert help

Recent Central Heating questions

I just replaced my thermostat but i didn't shut off the power

i just replaced my thermostat but i didn't shut off the power first. the fan is working only now and the AC isn't onJA: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.Customer: i have a retail store and i needed to disconnect the thermostat and re-install it. i didn't shut the power off first (mistakenly). I re-installed the thermostat using the same wire configuration but the wires may have touched during this stage. The blower (fan) is working but the AC is clearly not because the air isn't cool.JA: Sometimes HVAC issues that that you think will be really complicated end up being easy to fix. The HVAC Technician I'm going to connect you with knows all the tricks and shortcuts. Is there anything else important you think the HVAC Technician should know?Customer: it's a central heat and AC unit for a retail store. Electric. The thermostat is hard wired and also has a backup batteryJA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.

Read more

Brian HVAC Guy

HVAC/R Consultant

High School

1,406 satisfied customers
Got an old central heat and air conditioning unit model

Got an old central heat and air conditioning unit model GDA100NDA SERIAL #917310. Trying to find where to oil the fan bearings. Fan makes a LOT OF NOISE.

Read more

2,922 satisfied customers
We have a BAXI LUNA HT 380 installed in our some in NH (part

We have a BAXI LUNA HT 380 installed in our some in NH (part time there and NJ). When it was installed we were told no annual maintenance was required. I find this hard to believe. Didn't see anything that suggested what would be needed..... or who the recommended technician would be.JA: I'll do all I can to help. Is there anything else the HVAC Technician should be aware of?Customer: We are having no issues. We love the heat and efficiency. $1000 to heat a house in NH in many sub-degree days.... not shabby. Oh yes, hot water base board heat!JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.

Read more

Rick

Owner

23,620 satisfied customers
25)the effects of small carbon particles inside the

25)the effects of small carbon particles inside the refregeration system include?a)stregthening the compressor motor magnetic fieldb)grounding hermatic compressor terminalsc)improving internal compressor lubricationd)making the compressor shell britle31)to improve an air conditioners dehumidification capacity?a)shorten run times an increase airflowb)long run times and slow evaporator air flowc)oversing the unit for the square footaged)oversing the unit increase airflow and shorten runtimes34)what air property is measured in grain?a)wet buld temperaturesb)grain are used to measure the amount of water in the airc)relative humidityd)te weight of air35)the enthalpy lines are nearly parallel to the lines for?a)volume b)dry bult temperaturec)wet bulb temperature d)grain of moisture36)what is the advantage of the extened media surface area in pleated filters?a)reduces the pressure drop across the filterb)created cyclonic filtrationaction between the pleatsc)allows the filter to be flipped over when one side is dirtyd)allows filter to be folded38)in general how does condenser size affect a systems SEER?a a smaller condenser has a higher SEERb)condenders with larger diameter tubing have a higher SEERc)a large condeser has a higher SEERd)the condenser size dose not affect a units SEER

Read more

Airheatman

Heating & Air Conditioning Contractor

6 years college

9,778 satisfied customers
I have a carrier central heating and air system. Heating is

I have a carrier central heating and air system. Heating is natural gas. The thermostat was changed but did not solve the problem with the heating system having to turn off the elect. power to it and putting it back on to get the heater to work every time when temp. dropps below setting. What may be the problem.

Read more

Kcrand36

Technician/Owner

Vocational, Technical or Trade School

144 satisfied customers
Trying to connect new Honeywell thermostat from Rodgers one.

trying to connect new Honeywell thermostat from white Rodgers one.got R, G, Y, O , B and W wires.not sure if O wire goes to O/B (W) and then W wire can connect to W2? then B wire will be capped?

Read more

Daniel Plourde

plumbing, hvac technichian

Vocational, Technical or Trade School

448 satisfied customers
What is the difference in efficiency between the Trane

what is the difference in efficiency between the Trane mod#BWD742A100A or equivalentand a Newer Payne mod # ***** .House is in zip 864421300 sq ft townhouse with E and W exposures.

Read more

Phil

Consultant to Engrs, Govt & Contractors

Degree, Mech Engr Technology

9,868 satisfied customers
I have a 5 year old airtron central heating and air unit.

I have a 5 year old airtron central heating and air unit. The heat does not come on. the thermostat works and the flame comes on but the motor doesnt blow the air through out the unit. Is this a bad motor or a cap possibly

Read more

Airheatman

Heating & Air Conditioning Contractor

6 years college

9,778 satisfied customers
I have a client in Manhattan Beach California, their

Hello, I have a client in Manhattan Beach California, their Munchkin HTP boiler was installed 5 years ago.It servers 2 purposes, domestic hot water loop to heat storage tank and central heating of 2 FAU's (only used about 3 months out of the year)I was at the home and found the Display screen almost blank some small red dash marks were all that was displaying, I watch as it cycled the primary loop for hot water tank and all worked fine, when I tried the secondary loop to heat the home the pumps turned on but the boiler did not.I removed the cover and found the boiler has developed a small leak which drained down the wire hole of the display screen and started to calcify on the back of the circuit board, I'm guessing it has caused the program of house heating to not function.I am looking for a Munchkin certified company to come and service the unit and make repairs, can you help me find a locale company? the zip code is 90266Thank you for any help you can pervice, ***** *****, General contractor

Read more

BillyHvac

Journeyman Service Technician

State Licensed Mechanical Contractor

11,652 satisfied customers
View more hvac questions
In The News