Question about Heating & Cooling
After a brief neighborhood power failure Friday evening, the outside unit of my 5 y.o. Lennox heat pump (Merit Series) isn't working. I can spin the fan freely by hand. I want to check the capacitor, using a standard multi tester. My HVAC person will be here Wednesday, so I have til then to solve this.
Am I on the right track? I've double checked breaker box, thermostat & cleaned the outside ''kill'' switch. Inside unit is working fine.
Sweating in Atlanta (Liz)
First check for high voltage on the contactor. If 240 present on bottom is 240 present on the top? If no 240 on top then the contactor is not pulled in. Check for 24 on the sides of the contactor. If no 240 at all then its a breaker or fuse
Posted on May 25, 2017
Check to see if there is any board in the outside unit with a fuse .Maybe the fuse popped causing the unit to stop working .
Also check to see if you are getting 24 volts on the thermostat wire going to outside unit .
Posted on May 25, 2017
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Posted on Jan 02, 2017
Check your wiring between the contactor and compressor for a short to ground, or check the compressor windings for short to ground.
With the Tstat off, the contactor should be open so the only way for the compressor to be trying to do anything is if the 110 volts from the unbroken side are traveling through the compressor to ground. Since 110v is not enough to run it, the overload is kicking it out, cooling off, and repeating the cycle. When you kick on the Tstat, the contactor is supplying voltage directly to ground without going through the resistence of the compressor windings and kicking the breaker.
Post back and let me know what you find.
Posted on Nov 20, 2007
Clicking sound is the contactor engaging to start the outside unit. Check for a burnt off wire at the contactor. For some reason you are not getting power to the outside unit. If you find a burnt off wire shut off all power to it then remake the connection at the point of the circuit break.
Posted on Jun 27, 2008
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
Purple should be on "C".
The fan motor may be destroyed now. Switch the wire and see if it keeps running or not.
Posted on Apr 28, 2009
SOURCE: heat pump not running
check your house circuit breakers first that should be labeled heatpump or outdoor unit
make sure it is on and or not tripped
then if you have a box outside near the outdoor unit open it up and see if there is a breaker or maybe fuses that could be blown
Posted on May 26, 2009
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