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I can't get my a/c to work. I have a totaline residential thermostat P/N P374-1700. I set the thermostat to cooling only and set the temperature to 72 degrees and while the house is 75 degrees and the green light goes on, nothing happens. The fan doesn't run either. I have HVAC on both the lower floor of the house and a separate station on the upper floor. The upper floor station works. The lower floor station worked fine earlier today, but nothing now. Any suggestions.

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  • Master
  • 1,290 Answers

Check the drain line. Possibly tripped the float switch because the drain is clogged. Don't leave float switch out, you'll have to vacuum drain clear.

Posted on Jun 04, 2017

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6ya6ya
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Posted on Jan 02, 2017

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refritech08
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SOURCE: air conditioning unit not cooling

the problem sounds like a defective capacitor its located on the condensing unit outside, also a contactor that is used can be defective also.

Posted on Jun 15, 2008

mastatech
  • 478 Answers

SOURCE: Amana 1 ton Residential AC / Outside unit comes on for a sec

open the service panel to check for control voltage of 24volts when tstat calling, The contactor should be pulled in, if contactor is down,and contacts appear to be clean, and the unit is still not running, it is a bad compressor. to test this unplug the black wire from the compressoror at contactor,w/ power off! Turn on power if fan works normally it's a bad compressor. However if you see a swollen split cap(5 wires to a soup can looking w/ the terminal C,F,and Comp), switch it first and start at square one.
You also need to consider the high pressure switch if its cycling on off on off.

Posted on Mar 12, 2009

relaga58
  • 158 Answers

SOURCE: My carrier air conditioning unit does not cool below 72 degrees

there is a leak and need to fix it before you can charge it

Posted on Jun 28, 2009

  • 1 Answer

SOURCE: Air conditioner constantly running, not cooling house

Ours was worse than yours. It was not frozen up, but it did need freon. The tech told us that the compressor coil (the unit in the attic) was leaking freon and that the unit would have to be replaced within a year, but adding freon dropped the temperature inside from the mid-80s to the mid-70s (on 100 degree days). It might go lower, but we don't set the thermostats below 76. We paid $80 for the service call plus another $197 for 3 lbs of freon (for our 4-ton unit). Total cost: $274. The quote to replace the system with a new 14 SEER unit is $7,000 -- but this will get us through the summer. Oh, be sure to replace your filters monthly and keep your condensor fins clean. Spray them down with a hose (even while the unit is running), make sure there are no leaves or other trash blocking them, and make sure you have 2 feet of clearance around the condensor. Putting plants or other objects right up against it will impede its operation. Good luck!

Posted on Jul 04, 2009

  • 55 Answers

SOURCE: First time using the AC. Won't go on. Heater works.

lower temp setting lower then outside temp should work

Posted on Aug 06, 2009

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