Questions tagged [central-heating]

For questions regarding a central heating system for the home. The system consists of a furnace or boiler and a method to distribute the heat throughout the home.

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Trane BLU068-A1 Furnace not heating

I have a Trane BLU068-A1 furnace that will not "heat" (the fan will run) on its own. I "can" get the furnace to heat by using a long bbq lighter and lighting the pilot light ...
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1 vote
1 answer
62 views

Did I wire this furnace correctly?

I'm planning on connecting a nest thermostat in the next few days once my wifi is hooked up. In the meantime, I found an unused blue wire at the furnace and hooked it up to the C. My current ...
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2 answers
38 views

Viessmann Vitodens 333-F set Temperature is stuck at 5 °C

My Viessmann Vitodens 333-F does not start the gas burner automatically. Here is what I checked so far after logging in with viservice for the service menu and viexpert for the parameter Level 2 menu. ...
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Why is there shimmery white dust coming from my floor vents?

There is a white dust settling around all of my downstairs floor vents. It’s got a shimmer to it. I haven’t noticed it upstairs coming from the ceiling vents. We had all new HVAC done a year ago when ...
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1 answer
60 views

Why does the blower on my furnace run after the burner turns off?

I have an older Trane furnace. I have had HVAC people out here, but they are not listening to me when I describe what it does, so I was hoping to get some public input on this issue. The house will ...
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1 answer
43 views

Furnce shutting off frequently. Have to blow air into exhaust vent to turn on. Why is that?

I have high efficiency natural gas furnace. In the picture you see intake and exhaust vents on the outside of the house. Specially in colder days temperature reaches below target temperature, ...
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2 answers
117 views

Why does water in a radiator not flow directly from inlet to outlet without passing through the upper part?

To an answer to How does water travel through a modern column radiator a commenter asked Does this mean that you could completely open the exit valve, but half-open the input valve, and the water ...
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1 vote
0 answers
124 views

How to configure Honeywell combine W2/AUX/E terminal for Emergency heat?

I have a Honeywell RTH9585WF1012 to control my forced air furnace system which has: Cool: 1-stage heat pump Heat: 1-stage heat pump (same) + Expensive emergency gaz heat from furnace. Older ...
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24 votes
5 answers
3k views

How can I protect a frozen heat pump in cold weather while waiting for service?

Yesterday I noticed that my Carrier heat pump was struggling to keep up with my thermostat settings inside the house. It was around 35°F (2°C) outside, I had the thermostat set at 72°F (22°C), but the ...
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1 answer
63 views

HVAC - noisy preheat

When the heat comes on I hear a noticeably loud whirring sound in the beginning. It only lasts for a couple minutes and then quiets down while the fan continues to blow heat throughout the home. I ...
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How to get good HVAC quotes?

My natural gas furnace and air conditioner are 20 years old. I plan to gather quotes to replace them both. What do I need to do so that I get good quotes? I've heard HVAC contractors talk in an online ...
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2 votes
1 answer
152 views

Inducer motor turns off immediately after the pressure switch closes

My furnace is not working properly (ICM2805A control board, or Nordyne 624631A). When I turn it on, the inducer motor will start spinning and shut down immediately, the board will reset, and try again ...
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1 answer
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Electrical panel requirements for in-floor heating?

I have the unenviable task of replacing a floor (or three) in my home in the coming weeks/months. We are considering a mix of tile and solid hardwood. It appears that it is possible to retrofit in-...
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1 answer
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What modifications needed in order to use used cooking oil for heating instead of diesel?

In Greece the heating oil went up to 1.20 Euros. Meaning that is WAY too expensive to burn. Therefore, I look for alternatives and the used olive/vegetable oil from local souvlaki/gyro store seems ...
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1 vote
3 answers
172 views

Is it more economical to keep the house at the day temperature, or let it go down during the night and reheat in bulk in the morning? [duplicate]

With winter approaching, I wonder: Is it better and more economical for the heating system to stop/tone down heating during the night (like letting it go down to 14C) or try to keep a constant temp ...
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1 vote
3 answers
76 views

Alternatives to mains pressure shower

Our current shower is a tankless mains pressure type and is instantaneously heated by a gas combi boiler. Eventually we intend to build our own house and I am looking for non fossil fuel heating for ...
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-1 votes
1 answer
159 views

My hot water won't turn on unless the central heating is on as well, why?

I've looked at a few related questions, and I can't see a similar question being posed. Our hot water taps only work (i.e. produce hot water) if the central heating has been on, which we tend not to ...
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1 vote
1 answer
57 views

Vertical radiator on single stud?

I have an internal, decorated plasterboard wall (aka drywall outside UK) with poor studding: 120cm from its left end, there is a 22mm wide (i.e., as measured horizontally parallel to the wall) stud, ...
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1 vote
1 answer
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Finding where the C "Common" wire should be in my heating unit

I'm trying to understand where the common wire would be from my system's wiring diagram. The thermostat itself only has the R and W connected. Is my understanding correct that it would be the wire ...
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4 votes
3 answers
1k views

Should I add air ducts when finishing my basement or rely on space heaters?

I am going have a finished basement of 1000 sq/ft which includes a theater room of 12X16. Currently I am in process of planning in stalling duct work to my basement. I am thinking of not putting duct ...
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Heater warms up but won't blow, fan is good

I have a Lennox Whisper Heat Central Heat unit model G20Q3E-75-4 natural gas heater. It worked fine until today, and nothing has changed about the house or the heater, we have electricity and gas. The ...
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0 answers
36 views

HVAC furnance runs for awhile, stops for 2 minutes, then starts back up and continues to heat until set point reached

I have a Carrier 58GS150 system. At night it is set to 69. In the morning it is set to 72. Recently, I replaced the air filter. The system starts up fine in the morning and tries to reach 72. ...
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1 vote
0 answers
106 views

How to balance pressure in a multi-zone damper hvac with an always on bypass valve

Background I'm the new owner of a multi-family home where the previous owner was a large corporation that made money by overspending on renovations. Thus, they tended to renovate with top-tier ...
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0 votes
1 answer
27 views

When switch furnace on, ventilation fan turns off

Ventilation fan works fine when heating is off but immediately switches off when heating is turned on. Consequently the furnace runs for a minute and then overheats and turns off. Any idea what could ...
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1 vote
1 answer
85 views

Best way to temporarily relocate a radiator?

I need to move a radiator a few feet along a wall for about a year or two to avoid some furniture, and then move it back to its original location. I'd therefore like to avoid having to lift all the ...
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0 votes
1 answer
64 views

Zoned Forced Air System Runs 2.5X Upstairs vs. Downstairs

I bought a house built in 2005, ~4100 sq. ft. Reasonably insulated to code, as required in Chicago, IL. I've got an upstairs thermostat and downstairs thermostat. Both are Nest thermostats ...
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3 votes
1 answer
67 views

Heater blowing cool air

I did an experiment with the central heater when I noticed it was blowing slightly cool air. I first let the temperature drop to 67 degrees. Then, I set the thermostat to 68, which triggered the ...
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1 vote
0 answers
22 views

Improving HVAC post Remodel

We are living in a house that was originally built in the 80s with a gas furnace and forced air. Prior to our purchase, the house underwent a significant remodel including the addition of two rooms ...
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0 votes
2 answers
357 views

Radiator behind sofa - Box Design

Unfortunately, the only place we can have a sofa is in front of the radiator and the radiator cannot be moved. I am thinking about building a box around the radiator to achieve the following: The ...
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2 votes
1 answer
4k views

Bleed radiators with no valve - is this valve near the boiler what I want?

I recently bought a house, and with the winter starting to set in (UK), have started putting the heating on in the mornings/ evenings. As many people are at the moment, I am currently working from ...
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0 votes
2 answers
474 views

Two zone hvac on single compressor [closed]

I have a two zone HVAC system with two compressors (A and B). When I run the heat on Zone 1, it uses compressor A and when I run the heat on Zone 2, it also uses compressor A. When I run the A/C, it ...
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1 answer
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I live in the Northeast area of the US, and my emergency heat on my furnace/ac is broken. Can I get thru the winter months without fixing it? [closed]

I live in the Northeast area of the US, and my emergency heat on my furnace/ac is broken. Can I get thru the winter months without fixing it?
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0 votes
2 answers
168 views

What can be safely attached to a gas furnace cabinet?

The gas furnace in my house is in my laundry room about 3 inches from a stacked washer and dryer. As such, my laundry room is short on space, so I had the thought I could add some organization by ...
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0 votes
2 answers
111 views

Why are their no cheap wifi thermostats? [closed]

We have a simple analogue dial-based room thermostat. The sort of thing that costs about £15. I'm considering replacing it with a programmable one - which would cost maybe £30. When I recently went to ...
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2 votes
1 answer
41 views

Boiler not responding to external wired switch

My boiler has suddenly stopped receiving signals from the external switch. (models listed below). I'm trying to isolate the faulty component. There is no fault code on the boiler. It seems to be ...
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1 vote
0 answers
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How best to capture and move the heat from oil furnace stove pipe more efficiently throughout room

In my basement the stove pipe that goes from the oil furnace to the chimney is always hot, so I feel like I should be capturing this extra heat and moving it about the basement. How do I keep this ...
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2 votes
1 answer
91 views

Replacement HVAC blower motor fails within 24 hours?

My unit is a Carrier Infinity (FE4ANF003T00ABAA) with an ECM 3.0 blower motor. To start, the thermostat reported a “Code 41 - Blower Motor Fault”. I ordered a refurbished motor + control module online ...
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2 votes
1 answer
142 views

Troubleshooting Gas Furnace Problems

I turned on heat at the thermostat for the first time in several months. Things worked at first with hot air coming from the vents, until a few moments later when I noticed that the thermostat panel ...
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5 votes
4 answers
11k views

Does my furnace suck air from outside?

I've tried Googling this but the stakes are quite high and I don't want to be wrong, so I'm asking here. Wildfires are raging in California where we live, and the Air Quality is nearing the 'hazardous'...
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0 votes
0 answers
44 views

Replacing Central air with a Split system

I'm trying to replace two central Air conditioners (one per each floor. 2-3 ton each) in my home and I'm not sure if I should go with Ductless (because of a much lower cost) or pay higher and replace ...
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0 votes
1 answer
1k views

Flex-duct as a Trunk?

From my A/C supply plenum, I will have a trunk (approx 20ft straight run) with 3 branches coming off (each about 2 ft runs). This 20ft straight run would be perfect for a large flexible duct, and ...
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1 vote
1 answer
198 views

Move heat out of living room with fireplace

I have a sort of rectangular house with a 25 m2 living room at one corner, and the master bedroom at the opposite long corner of the house. All of the bedrooms are up another level from the living ...
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0 votes
1 answer
1k views

Can I have a shared exhaust flue for a high efficiency furnace and tankless water heater?

I recently purchased and am installing a 96% efficiency two-stage gas furnace. The old unit was an 80% efficiency unit using a 4" metal flue. This flue merges the exhaust of both the hot water heater ...
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2 votes
1 answer
165 views

HVAC Heat only comes on when Fan is set to "ON" (not Auto)

have a weird problem that JUST started happening. When I turn the thermostat up with the fan set to "AUTO", nothing happens. The furnace does not light and the fan does not come on. This worked fine ...
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2 votes
3 answers
185 views

How to track energy usage per zone?

I have an old oil boiler with 4 zones, individual zone pumps. I'm trying to track heat usage on a per-zone basis. Would it be possible to simply track how often each zone pump runs and apply their ...
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1 vote
1 answer
811 views

Nest thermostat e heat link replacing the old danfoss

I really need help with replacing this current danfoss thermostat with a new nest thermostat e heat hub. I'm in the UK. Below is the new heatlink just need to know what wires I need to wire and what ...
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1 vote
1 answer
7k views

Baseboard water heat not heating one room; Rest of zone/house is good

I have a baseboard water heating system set up in three zones. One zone consists of two bedrooms and a bathroom at one end of my house. The thermostat for that zone is in the hallway connecting the ...
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0 votes
1 answer
97 views

Why do radiators need bleeding? Where does the air come from?

I had to bleed a radiator for the first time recently. This made we wonder where the air that gets trapped in radiators comes from. I'm not looking for a specific cause for my own heating system, ...
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  • 123
2 votes
1 answer
349 views

Viessmann Vitodens 200w, LCD screen stuck on

We have a Viessmann Vitodens 200w boiler and the screen on the weather compensating control unit (Vitotronic 200 Weather Comp Kit HO1) is stuck with everything lit up. I can’t find anything in the ...
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1 vote
2 answers
107 views

How can I use a pre-installed A/C unit for heat?

I just bought a house with a relatively two-year old A/C unit (installed 2018) and a natural gas furnace connected to central air. I'm interested in using the A/C unit as to heat the air in lieu of ...
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