Troubleshooting defrost problem

[creek]

I have been working on a Carrier heatpump model #HC1CJ030-A. The unit will not go into defrost. I have tested the defrost sensor and it is showing closed. I have bypassed the sensor with no luck. I have shorted the test pins, no luck. I have 24 volts between the defrost terminal and the common terminal. I have replaced the board with a new board, no luck. I work at an apartment complex, so I tested another unit by shorting the test pins, which it went into defrost. I then took that circuit board and installed it on the unit that is giving me the problem. Again, the unit would not go into defrost. The charge is correct on the unit. Any ideas?

Thanks, Creek

[lynn comstock]

Will the unit swich into the cool mode? (this tests the operation of the reversing valve.)
Beyond that our rules limit our help to non professionals. See the rules and apply.

[creek]

Yes, the unit will go into the cool mode. I'll disconnect the outdoor fan and run it in cool to defrost the unit.... What's the deal with the rules? I came to this site to get some ideas!

[keeplearnin]

check all the wiring connections if you are a tech if not call a pro. before you make the prob worse.

[hvacsteve82]

Creek,

Unfortunately, we aren't a DIY site. Please read the forum rules if you have any questions.

There are numerous things that could be wrong with your unit. Please turn to a professional to come out and check your system. If you are a pro, please get your post count up to 15 post's and apply for Professional status.

Thanks and welcome!

Steve

I have been working on a Carrier heatpump model #HC1CJ030-A. The unit will not go into defrost. I have tested the defrost sensor and it is showing closed. I have bypassed the sensor with no luck. I have shorted the test pins, no luck. I have 24 volts between the defrost terminal and the common terminal. I have replaced the board with a new board, no luck. I work at an apartment complex, so I tested another unit by shorting the test pins, which it went into defrost. I then took that circuit board and installed it on the unit that is giving me the problem. Again, the unit would not go into defrost. The charge is correct on the unit. Any ideas?

Thanks, Creek

[mitchellmech]

Chances are, you'll be better off either way by contacting a professional in your area and having them help you deal with the problem. That's always the safest, quickest, cheapest and most efficient way to diagnose the issue at hand.

Mitchell Mechanical
Only Pro members may have links to their company websites.

[creek]

I would like to thank everyone for there input, sorry if I stepped on any toes! I have been working with hvac for 30+ years. Started in 1980 when I enlisted into the US Navy Seabees. I then worked for a HVAC company in both there installation and service dept. With that said, I wouldn't consider myself as a DIYer. I'll figure it out...

Thanks, Creek

[beenthere]

I would like to thank everyone for there input, sorry if I stepped on any toes! I have been working with hvac for 30+ years. Started in 1980 when I enlisted into the US Navy Seabees. I then worked for a HVAC company in both there installation and service dept. With that said, I wouldn't consider myself as a DIYer. I'll figure it out...

Thanks, Creek

Get your post count up to 15, and apply for pro membership. Once accepted, you'll have access to the pro forums, where their is a lot more info that you will find very helpfull.

There is more then one apartment maintainence guy that is a pro member here.


To provide you with the info your asking for. Would leave that info out in the open forum for DIYers to use.