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  1. HVAC
    Hello. My furnace displays a 12 fault code. I've replaced the pressure switches, control board, flame sensor, and limit switch, I have a new capacitor and a new ignitor to swap out the respective components. The sequence: a call for heat will initiate the blower, in about 90 seconds the ignitor...
  2. HVAC
    I went to connect my gauges to a charge port on a Carrier 38MGQC18, and the port on this Carrier outdoor unit is slightly larger diameter than the typical Schrader connection ports I am used to. Is there an adapter I can get to connect to the Carrier charge port? photo at...
  3. 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...
  4. 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...
  5. HVAC
    I have a Carrier MCB58 gas furnace and since about two weeks it started making a rattling sound when the heat stops (transition from heating to fan circulation only). The filter is new. The blower is clean. The sound seems to be coming from the inducer. Here's a video of the noise (noise...
  6. HVAC
    Just had an AC checkup and was told I should have a hard start kit installed. Long story short, yes, I believe any large motor should include a startup capacitor/relay circuit...and after looking over my system, there isn't one installed. I believe the $300 for the tech to install it is rather...
  7. HVAC
    Hello and happy new year! since coming back from vacation, my hvac is not blowing HOT air anymore. everything was working fine before. it's blowing air now, but just when we increase the temperature, it's not producing HOT air. the thermostats are OK (they're all new from sep 2018), and...
  8. HVAC
    I have a gas furnace carrier weather maker 9200. It is giving error code for open roll out or limit switch. The blower motor continues to run, there is no power to my thermostat. I have checked the roll out switch with my meter and it shows the switch to be closed and in working order. I have...
  9. HVAC
    (background) I've got a 7 year old Carrier Infinity system (controller + furnace + AC) - it's working just fine but I've got a question. Is there a way to 'tell' the controller (SYSTXCCUIZ01 .... not the later touch-screen or Wi-Fi units) to only run the air conditioner in 'low-power' (bypass...
  10. HVAC
    I was trying to install a Honeywell tstat on my Carrier (conventional) split system. The original tstat had an orange wire at the O terminal, but the Honeywell tstat doesn't have this option, unless it is used for a heat pump. Leaving the orange wire off kept the air from cooling (I am assuming...
  11. HVAC
    Greetings fellow DIYers, I'd like to replace all four heat exchanger cells (Carrier part number 79988-50) on a 100,000-BTU/hour Bryant 394GAD048100 gas furnace. I like the modularity of individually replaceable cells, but it seems everyone is asking per cell what a complete heat excahnger...
  12. HVAC
    I have a 2004 Carrier 58mvp 120 130btu 1HP Ecm motor, with a HK42FZ022 board. Every time there is a power bump the furnace defaults to high blower speed. The AC works but no heat, I then I have to remove the model plug, switch on sw1-6, run the test mode until code 11 flashes, slide dip switch...
  13. HVAC
    I have the following set up in a newly constructed home. Carrier Infinity Series 98.5% Modulating Furnace Carrier 24ABB3; 2.5 Ton; 13 SEER; Aluminum Coil Carrier Comfort Zone 3-Zone System 2000 sq/ft home Just started using the AC 2 days ago. Our AC seems to keep cycling on and off when it...
  14. HVAC
    Today I noticed that my thermostat was set at 70 and it was 75 in the house. I went outside and the outdoor unit was working, I went into the attic and the blower motor was also working. But the furnace fan was not working. The light in the unit was not flashing or sending any codes.From the...
  15. General DIY Discussions
    Hi - I recently noticed my home humidifier was not working, it was an old Carrier. I replace the solenoid, the humidistat (even though I knew it was ok) and the circuit board. Nothing worked, so I purchased a new one from Carrier. It showed up and is a Totaline. I installed it just as the...
  16. HVAC
    I would like to disable second-stage heat completely on my Carrier furnace. How can I do that? Why? => My Carrier furnace often goes into "limit switch fault" and then "limit switch lockout" (more info below). I'm pretty sure this only happens when switching into the second stage and I want...
  17. HVAC
    I have an old furnace that is not working properly, a Carrier model 58SE150-3 series 314 from 1975. I have diagnosed the problem to a likely fused fan blower relay. In looking over some of the other forum posts people seem to recommend that I not replace the relay directly (a Potter and...
  18. HVAC
    Hi, I have a Carrier 58CVA/CVX furnace that is turning off. I called a repair man and he tried to pull codes and diagnose but couldn't find the fault. I would like to be more certain before spending $$ for a new motor. Any help is very much appreciated. Here's what it does: In the spring and...
  19. HVAC
    We installed the Carrier 59MN7 furnace along with an a/c unit last summer. The a/c modulates the fan speed up and down as it cools, and we found that it was nice and quiet as it blew cooled air at the lowest fan speed. However, ever since we began running the furnace for the first season...
  20. HVAC
    Hi, I have a Carrier HVAC 48HJE014 unit for my business. We are based in Westchester County, NY. They are natural gas units. I recently replaced the heat exchanger (actually did it on two units) and it worked out very well. The one unit is acting a little weird, here are the symptoms: **when...
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