I have 2 x 9000Btu split aircon installed in my house three days ago. In fan mode it works properly but when I switch to cooling mode the upper pipe from the outside unit freezes immediately, not cold air coming inside, just like in fan mode. The compressor sound running. The other aircon instead of blowing hot air from the outside fan it blows cold. Both aircons have the same problem.
Why isn’t the aircon blowing cold air
hvac
Related Solutions
If both your central air handling fan and outdoor compressor are running and your not seeing any sort of cooling after a 10-20 minutes than I'd venture a guess and say it's time to call an AC repair service.
I'm curious what you are pushing in that makes the compressor turn on? Are you somehow bridging the main capacitor? Capacitors tend to be a common point of failure on AC units and can actually be changed fairly easily. Here is a pretty good article detailing the steps to do so.
To be honest though I'd guess that the bigger problem is the fact that you can get it running and it still isn't putting out cold air. The whole situation sounds like it's low on coolant (have you had it filled in the last few years?). AC's usually have a low coolant pressure switch that will keep the unit from running to prevent damage to the compressor when there isn't enough pressure.
Call an AC service out, many will diagnose your problem free of charge and be able to give you a much better idea of your problem. Be warned though, if your system is old and uses R-22 prices have shot up in the last year.
It would be very, very odd for an inducer motor to blow out the burners and pilot. If it was the case, and since inducers come on before the burners are ignited, I'd expect it to blow out the pilot before the burners ever ignited. That pilot is much easier to blow out than the burners.
My suspicion is this: Furnaces that use inducer motors often have pressure sensors that detect whether or not the furnace draft is properly in place. If it is not, the gas to the burners is shut down (I wouldn't be surprised that the pilot is shut down, too, for safety purposes — nowadays most furnaces with inducer motors use electric ignition to avoid the issue). This is actually a good thing. An improper draft can cause big trouble in your house (like everybody-dying-from-carbon-monoxide-poisoning trouble). So this is a behavior you want to have.
Many furnaces have an LED light that blinks an error code when this occurs (my light in in the main blower area, not the burner area, but there is a small transparent window so I can see it... in the dark... with my hands over the window...).
Something getting in the way of a proper draft is more likely your problem. It could be caused by the new motor not having enough umph for the exhaust setup in your house or a pressure switch having become too sensitive over time. It could also be caused by dirt/dust/spider-webs/buildup in your exhaust pipes or something partially obstructing the exit (most are on the roof, but if yours in on a side wall, are there plants grown up around it?)
What's important is to find that LED (I'm hoping you have one) and either getting out your furnace's manual or finding it online and checking out what the error code is. The blink code would happen right after the burners are shut down.
Best Answer
When you says it freezes up, do you mean that you get ice build-up on the pipes and/or condenser? If so, there's nothing you can do yourself. Call an AC tech.