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  1. HVAC
    I have a Day and Night single stage high efficiency 80,000 btu furnace that is roughly six years old. I live at roughly 4500ft. I've had nothing but issues with my pressure switch since the house was built six years ago. Every winter generally starting in December, it will trip constantly. Most...
  2. HVAC
    So the question is really in the title. My carrier air handlers fan will not shut off. I have done the following: checked to make sure the fan was not set to on via the nest t stat. pulled nest off the wall to see if the fan stopped, it didn’t changed the only relay inside the air handler unit...
  3. HVAC
    Hi, A couple years ago, I bought some magnet air vent covers but they didn’t work well. I had put them inside of my vent instead (I know... I shouldn’t have because of backflow possibly damaging my unit. I know now). I took them off sometime a few years back and noticed the magnet/plastic was...
  4. HVAC
    Hi looking for some technical help with our HVAC system. I just replaced the blower motor in our furnace and it is running constantly since the change. I’ve disconnected it from the thermostat to isolate the problem and it still fires up as soon as the power comes on and stays that way with or...
  5. HVAC
    I'm trying to install a new thermostat. My system is only 6 years old. My current thermostat has this configuration. American Standard Thermostat OT1/Black OT2/Brown W3/Pink R/Red W2/Gray W1/White Y1/Yellow G/Green O/Orange B/Blue I am trying to install a Honeywell RTH7560E. Here are the...
  6. HVAC
    I changed my thermostat wiring from 18 /4 to 18 /5 to provide a common wire. I took pictures of the thermostat and Furnace control board so I could rewire with no issues. After everything was wired, I tested the thermostat. AC works fine as does the fan. However, I cannot get the heat to turn...
  7. HVAC
    Day and night - N9MSB0802120A1. Roughly 6 years old. So my limit switch keeps tripping. I used a multimeter to verify that it reads 24v when it trips. I also tested continuity and it was good. I removed the limit switch and used a jumper to keep the furnace running while using a meat...
  8. HVAC
    Hello, 2 years ago I purchased a 3 ton Carrier performance series A/C from a local company. I am now looking to replace my 14 year old furnace. I have received numerous quotes and have the following options 80% Carrier infinity series from company A - $4,100 58TN0A070C17--16 use all existing...
  9. HVAC
    I took the front panel off of my AC air handler looking for a common wire for a smart thermostat. When I took the panel off, I found a couple of wires have what I think is dried mold on it, but I'm not sure. Does anybody know what else it could be? These wires are above the coil. Whatever it is...
  10. HVAC
    I recently purchased a home that has a Venmar air exchanger installed (Venmar HRV Constructo 1.5 ES). I noticed it is ducted in reverse to what is suggested by the manufacturer. Where typically fresh outside air would flow from top left to bottom right and return from indoors top right and exit...
  11. HVAC
    Thank you in advance. I am finishing a basement. I have a vent (output) installed on one side of the room. I have an area on the other side of the room I want to install a cold air return. I am more concerned about heating in the winter as the basement stays cool all summer and the...
  12. HVAC
    When thermostat calls for AC, the motor starts (x13 motor) and stops every few seconds. The fan does start moving but the system doesn't fully start. The motor makes a slight noise (like something is shorting) then shuts off. A very quick look online seems to suggested replacing motor unit -...
  13. HVAC
    I am looking into options to heat/cool an 18x24 room I finished. I have a couple estimates from HVAC companies but don't think a 2 ton system is necessary and don't want to spend 5k. I have heard mixed reviews about DIY mini splits, but the GEN 3 Mr Cool systems seem to have good reviews. Has...
  14. HVAC
    This furnace is letting out cool air along the side of the wall. I felt with my fingers there is no tape, silicone, sealant etc. But space is too tight to seal, What to do?
  15. HVAC
    Hello everyone, Two days ago, my attic unit was making crashing noises to the point where air flow completely stopped. After investigating, some of the blower wheel blades were broken and broke the wheel in general. After replacing the blower wheel with the exact same specs, the attic unit is...
  16. HVAC
    I am replacing an old mercury-based thermostat with a digital one. It's a honeywell RTH6400D100. The existing system has the following wires: yellow connected to a pin labeled 'Y' green connected to a pin labeled 'G' red connected to a pin labeled 'R' orange connected to a pin labeled 'O'...
  17. HVAC
    Hello, This is my first post. I recently tried my hands at replacing the ac fan motor.(After AC person told me the fan wasn't rotating as freely as it should. And motor would probably have to be replaced soon.) I wish I took notes on how the unit sounded/vibrated before doing this. Long...
  18. HVAC
    Is there a rule as to how far or close to the outside basement wall ceiling registers should be? I did some searching online and reviewed the building codes and cannot find anything. Based on the layout I am wanting to place the outside edge of the register at about 22” from the wall...
  19. HVAC
    Hello! I have gone through a fair amount of options trying to solve this and it has not been fruitful. I was wondering if anyone on here might have experienced this before, or maybe has a recommendation on what I should try next? We got a house last year with a Carrier furnace. We are in...
  20. HVAC
    Hello all, I live in a 19th century farmhouse. When I moved here in 1998 the prior owner had already installed an oil furnace and ductwork to the 1st and 2nd floors. Shortly after moving in, I learned that the heat exchanger in the furnace was cracked. I worked with a local supply and we...
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