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Old 12-28-2011, 09:01 PM   #1
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Heat pump not working! Tested capacitor!


Heat pump quit working. The outside unit doesn't come on. It is an Intertherm brand. It has a dual run capacitor. I removed the capacitor and discharged with screwdriver but didnt really notice anything happen. It's a 40/5 370vac capacitor. I tested and got 40.22 and 5.0 readings. Thought for sure would be capacitor. Did I discharge correctly? Was expecting like sparks or something lol. When turning unit on you can hear humming and that's it. Blades move freely moving with stick. What else do I troubleshoot next if capacitor is indeed good? Thx. Mike!

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Old 12-28-2011, 09:13 PM   #2
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Heat pump not working! Tested capacitor!


Do you have 240 volts coming to the contactor.

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Old 12-28-2011, 09:16 PM   #3
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Heat pump not working! Tested capacitor!


Is the breaker tripped?
Any burned wiring visable? (Look down toward the crank case heater on the compressor)

Is the contactor pulling in with demand? (No might point to a pressure switch)

Is the compressor hot? (Yes might point to the fan motor or defrost control)

Will the fan run if you unplug the fan wire from the defrost control and connect it to the contactor? ( the side of it feedind the defrost control)
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Old 12-28-2011, 09:17 PM   #4
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Heat pump not working! Tested capacitor!


I was assuming getting power from the humming when turned on. What points on contractor do I need to check at? Thinking off top of my head there was several connections. I will check that. Was thinking fan motor? Will condenser run without fan running? We knew fan wasn't working because with heat pump on the house would not build heat and stayed running forever.
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Old 12-28-2011, 09:18 PM   #5
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Heat pump not working! Tested capacitor!


Where the main connection comes into the contactor from the disconnect box.
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Old 12-28-2011, 09:19 PM   #6
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Heat pump not working! Tested capacitor!


The humming could be from the contactor pulling in with 24VAC supplied from the indoor unit (separate breaker).

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Old 12-28-2011, 10:01 PM   #7
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Heat pump not working! Tested capacitor!


Awesome! Can't wait to get out tomorrow and do some more troubleshooting. I will let you guys know what I find. I greatly appreciate the quick response.
Been jinxed here lately but been very educational also. Christmas Eve my thermostat says no a/c power. After researching and help from web I found a broken terminal coming from load side of breaker going to contactor inside furnace. Crimped new end in and reconnected and was good to go Christmas afternoon in time for dinner.
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Old 12-29-2011, 02:24 PM   #8
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Heat pump not working! Tested capacitor!


Tested capacitor again today and got a 4.44 on fan so went in town and found one for $12. Swapped it out and......... NADA. 240v to line of contactor, 24v across contactor coil, NOT 240v with thermostat calling for heat. I barely touch the contactor button and TADOW! Running like a champ. Is there anything I can use to lube it to prevent future sticking until I decide to swap it out. I cant tell you how stoked I am and appreciative I am for people like you guys' help! Much appreciation!!!!!!
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Old 12-29-2011, 02:53 PM   #9
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Heat pump not working! Tested capacitor!


Clarify NOT 240v to load side of contactor.
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Old 12-29-2011, 03:37 PM   #10
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Heat pump not working! Tested capacitor!


Just replace it. there is no lube made for it.
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Old 12-29-2011, 06:21 PM   #11
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Heat pump not working! Tested capacitor!


Can I pick them up local also?
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Old 12-29-2011, 06:29 PM   #12
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Heat pump not working! Tested capacitor!


probably, its a common part.
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Old 12-29-2011, 06:42 PM   #13
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Heat pump not working! Tested capacitor!


If you can properly test and change (you did good on the test, even though you didn't need to change it, keep the old one) a capacitor you can replace your contactor.
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Old 12-29-2011, 06:47 PM   #14
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Heat pump not working! Tested capacitor!


I just saw your other post. If the fan side of the cap read <4.5 I would have changed that myself. Go get that contactor and have at it!
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Old 01-02-2012, 09:59 AM   #15
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Heat pump not working! Tested capacitor!


O.K. So I hadn't got around to replacing contactor as it been working fine so it seemed and been pulled in million directions. Don't ask! Anyways I happen look out and notice the outside unit shut off but the thermostat was still calling. I was like hmmmmmm. Shut it off and called for it and didn't come on. I'm thinking i got to make time fix that contactor today. I go out touch the coil and yep it's stuck but this time when it pulls in the unit just makes noise as if it's trying to start but can't and fan don't come on. Like a loud growl. I also noticed there is liquid at the top of the blue canister inside the unit.

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