In This HVACR Training Video, I Show the Top 5 Problems that can occur while Troubleshooting a Contactor. The HVAC Contactor is what turns on the Compressor and Outdoor Fan for Air Conditioners and Heat Pumps. Supervision is needed by a licensed HVACR Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.

Tool List-
Support-

Here are some of the Tools I use:

UEI DL479 Multimeter with temp sensor
Yellow Jacket Refrigerant Gauge Set
Refrigerant hoses with valves
Yellow Jacket Gauge set & hoses
Yellow Jacket 4 Port Manifold w Hoses
FieldpieceSMAN360 Digital Manifold Set
FieldpieceSMAN460 Digital Manifold Set
Compact Ball Valve for Refrigerant Hose
QuickDisconnect 90 for refrigerant hose
JB 6 CFM Vacuum Pump
Appion Blue 3/8″ to 1/4″ Vacuum Hose
Appion Red 3/8″ to 1/4″ Vacuum Hose
Appion Valve Core Removal Tool
Yellow Jacket 1/4″ by 1/4″ hose
CPS Vacuum Micron Gauge
Supco Vacuum Micron Gauge
RectorSeal Bubble Gas Leak Detector
UEI DL389 Multimeter
Fieldpiece ST4 Dual Temp Meter
Air Acetylene Torch setup
15% Silver Brazing Rods
Nitrogen Regulator
Nitrogen Flow Meter
Digital Refrigerant Scale
Accutrak VPE Ultrasonic Leak Detector
Imperial Kwik Charge 535-C
FieldpieceSDMN6 Dual Manometer Pump
Supco Magnet Jumpers
2 pairs of alligator clips-
JB Vacuum Pump Oil
General Tools digital Psychrometer
Fieldpiece SDP2 Digital Psychrometer
Ratcheting Service Wrench
Appion G5 Twin Recovery Pump
Irwin Wire Stripper/Cutter/Crimper

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24 thoughts on “TOP 5 CONTACTOR Troubleshooting Problems!

  1. AC Service Tech LLC says:

    Support- https://www.patreon.com/acservicetech

    Tool List- https://www.amazon.com/shop/acservicetech

    For those that are looking for the tools used in the videos: (Linked Below)

    UEI DL479 Multimeter with temp sensor http://amzn.to/2jtsUbJ

    Magnet Jumpers- https://amzn.to/2PyKPQZ

    Alligator Jumpers- https://amzn.to/2PxqJXn

    Fieldpiece ST4 Dual Temp Meter http://amzn.to/2wc1ME3

    Fieldpiece Bead K Type Temp Sensor https://amzn.to/2DBwKfs

    Fieldpiece Wet Bulb Temp Sensor https://amzn.to/2RRI7Tw

    Fieldpiece TC24 Temp Clamp https://amzn.to/2qHLyjZ

    Yellow Jacket Refrigerant Gauge Set http://amzn.to/2aenwTq

    Refrigerant hoses with valves http://amzn.to/2aBumVI

    Yellow Jacket Gauge set & hoses https://amzn.to/2vLVkV9

    Yellow Jacket 4 Port Manifold w Hoses https://amzn.to/2BkuGIq

    FieldpieceSMAN360 Digital Manifold Set https://amzn.to/2BdoaD4

    FieldpieceSMAN460 Digital Manifold Set https://amzn.to/2nB4Fe6

    Compact Ball Valve for Refrigerant Hose https://amzn.to/2KUisW8

    QuickDisconnect 90 for refrigerant hose https://amzn.to/2MMtVcg

    JB 6 CFM Vacuum Pump http://amzn.to/2nqbvo8

    Appion Blue 3/8" to 1/4" Vacuum Hose http://amzn.to/2uYlVyc

    Appion Red 3/8" to 1/4" Vacuum Hose http://amzn.to/2uYg6Ro

    Appion Valve Core Removal Tool http://amzn.to/2uYr8WL

    Yellow Jacket 1/4" by 1/4" hose http://amzn.to/2umtcod

    CPS Vacuum Micron Gauge http://amzn.to/2v1nM3O

    Supco Vacuum Micron Gauge http://amzn.to/2v1JRiA

    RectorSeal Bubble Gas Leak Detector http://amzn.to/2ckWACn

    UEI DL389 Multimeter http://amzn.to/2xAdaJf

    Air Acetylene Torch setup http://amzn.to/2aQalsb

    15% Silver Brazing Rods http://amzn.to/2gVLyLc

    Nitrogen Regulator http://amzn.to/2bXdR5f

    Nitrogen Flow Meter http://amzn.to/2brvoBg

    Other tool links can be found in the video description section.

    Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- https://www.amazon.com/shop/acservicetech

  2. Michael Costello says:

    So high amp draw on motor or solenoid coil could be due to the low voltage being supllied due to bad contactor or coroded terminals. Excellent. THANK YOU. Does the same theory apply to DC coils. Will they draw higher amps if voltage lower than design ???

  3. Allwayzangry says:

    Electric is my weak point I want to build a practice board. But is there any way to get better at understanding what I'm looking at and figuring out where the problem is?

  4. CA. says:

    Great video, thank you!
    Also I believe under voltage from the thermostat may burned the contactor coil.
    I made the mistake to install a Nest thermostat with no C wire, just connected to the R wire for power, and even though the thermostat seemed to work and the condenser unit was working, after a few hours the condenser unit was short cycling. Changing the contactor worked for one day, I'm guessing less resistance so it worked all day until the day after, short cycling again. I pulled a C wire out of the air handler bundle cables and connected it to the thermostat and it has worked ever since, no more short cycling.
    When it's Summer in Arizona, you need AC ;o)

  5. Emperor Sanders says:

    My fuse keep on blowing. Next gave me E103 – over current on y1 error and I was able to change the contact. It worked one hour before same error . I put the ok’d thermostat and now it blow my fuse each time I turn it on. What can I do.

  6. Bud Quarles says:

    Good stuff. I've been having issues with trainees not understanding why the low voltage is not killed when the disconnect is turned off outside on a split system with a single transformer. Also have you thought about covering dual contactors and interlocked contractors on 2 speed units?

  7. Ians Strung Out Guitars says:

    Man I rewired/rewound the coil 3 times on mine, filed those contacts so nice & pretty but I keep getting this horrible buzz. The dual cap is new, I've tried 3. I tried 4 different relays. I hard wired the main power wires in with industrial connectors. I got the right amount of r22. Some dildo jacked my dual cap & we didn't know it, turned it on & it arched. After I replaced the cap it worked fine for a day but the buzz came. Then I looked & the wires were melted around the connectors on the dual cap & the relay was spaking. The fan runs fine, the compressor runs if you remove the contractor all together & drill 2 holes on either side of a old 1950s industrial fuse(yeah we're in wv & poor but have lots of weird stuff & strange dangerous ideas lol) Anyway the thermostat & everything in the cellar is fine. It's getting 24v but something is up with the contactor even though it closes perfectly fine with very little resistance when taken off & hit with 24v. ..I know you get stupid questions all the time & it sux because some sound ridiculous & I'm sure mine is up there but we really don't have the loot, we just bought a apt & have been remodeling it & the house, it's old but because it's r22 it's going to cost a fortune to take the next step. More than a old lennox is worth. Any idea what could cause the problem?

  8. anarchy 1408 says:

    What would cause the contactor to buzz when the cold on thermostat is on but the whole ac system is shut off at breaker? My house isn't cooling down but the fan is working. I'm not positive if the compressor is working or not cuz I can't tell by listening…..but line or pipe that has the insulation on it is dry and not very cool which ik it's supposed to be cold and have maybe some condensation on it. Do you think this would be because of the contactor buzzing thing or maybe it's the dual run capacitor? The capacitor doesn't look like it's bad but I don't have a multimeter to check it and I'm trying to fix this on my own cuz I'm very very tight on money right now. Thank you in advance for your advice

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