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I have a bryant out door unit heat pump 661cj030-a. I recently lost the 27vac transformer in the indoor unit. Replaced it and ran fine for 4 weeks. I lost the 27vac again but wasnt tranformer this time. Outside unti was holding the 27 volts down. I disconnected all outputs to logic bd on outside unit only leaving wires connected from inside unit. 27 volts held up. I started putting outputs back on. lost the 27volts when i connected defrost thermostat to logic bd. I ohmed out thermostat and it shows closed or s. first shorted. should this be closed even though outside coils are not frozen or cold.(unit hasn't been running for days and its warm outside). EVEN THOUGH ITS SHOWING CLOSED- THATS WHAT it dOES RIGHT -OPEN AND CLOSE-SHOULDN'T CAUSE 27VAC TO gO TO 0 volts.With defrost thermostat pulled off, i can run heat or ac ok. when i tell logic bd to speed up and go into defrost mode it wont but i have themostat discoonnected so not sure if that is stopping that. Right now i still think its logic bd but could be thermostat or maybe even reversing valve since cant get it to go into defrost. help. dont want to order 100.00 bd if it could be something else. Does coil defrost themostat normaly closed and it opens or should it be open and then close.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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watugot
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SOURCE: Ruud heat pump outside unit trips circuit breaker

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

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SOURCE: Evaporator coils iceing over; warminhg on frig side of model 106....

As I said; the fan and compressor run fine but I cannot find the defrost timer. Is it integrated into the control board.
Thanks

Posted on Jul 30, 2008

farfield
  • 462 Answers

SOURCE: burning up transformers

YOUR the first person that has gave enough information to help in a WHILE THANK YOU SO MUCH!!

Start all over from first
I'm betting that you need a fuse in both sides of the transformer until you find the real reason they burn up.

A solenoid valve that sticks can cause the transformer to blow but so can a lot of other things, namely anything in the control circuit that uses the 24V power. A relay or contactor that doesn't pull in or a defective defrost control, a shorted wire from the thermostat.

I'm wondering if you have what we call a package heat pump meaning the both the indoor blower and out door compressor & fan are in the same section out side? OR is your a split system with an indoor section and an outdoor section?

I'm betting on the split section. In some miss-matched systems (like a Lennox indoor and a GMC out door for example) Some of the origonal Lennox heat pumps had an out door and an indoor transformer. If these trans formers were not "phased" together it could cause a problem like your having. Now you just have it in the heatign mode if I read between the lines correctly. So it makes snece that it's something with the heat. The out door unit can opperate withits own 24v but if you have back up heat inside (gas or electric Im thinking you have electric) the indoor section will come on atfter a few more degrees of heat loss (2-4'F). This is where the transformer inside will buck the one outside and somethjing has to give. The weakest point.

From what ive been told by some of the old hands I've been around if the high volt side burns out look for a low volt problem if the low volt burns out look for a line volt problem.

If this has 2 transformers like I suspect try the fuse on both sides but remember the one is hot and will remain hot all time on 220V or 1 leg of it or it might remind you. To phase these transfoprmers I believe you swtich the main lines L1 & L2 at either of the transformers. Now 1 more thing the indoor section may be using ground on the low volt side as a path for 1 side of the transformer. I believe you will ahve to do same for the other transformer too.

Hope this helps Id really like to know what you find and do.
Please ask more and you give such detail I can follow you with little trouble. Please rate me as high as you can and good luck.

Posted on Mar 30, 2009

  • 3197 Answers

SOURCE: Garage door opener (chain) motor runs in reverse. Trolley slides forward trying to close door, even though it is closed, instead of sliding toward motor to open door. Happened out of the blue - was

Loosen the chain enough that you can remove it from the sprocket. Run the opener until the sprocket turns counterclockwise and stops. With the door in the open position replace the chain. You will probably need to adjust your open and close limits per your owners manual.

Posted on May 29, 2009

  • 2 Answers

SOURCE: AC Fan doesn't blow cold air, frozen coil noticed outside, resetting power resolves temporarily

You need to call a reputable service technician.  The freezing up usually is associated with a low refrigerant charge or low air flow.  Check your return air filter and replace as needed.

Posted on May 30, 2009

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Burning up transformers


YOUR the first person that has gave enough information to help in a WHILE THANK YOU SO MUCH!!

Start all over from first
I'm betting that you need a fuse in both sides of the transformer until you find the real reason they burn up.

A solenoid valve that sticks can cause the transformer to blow but so can a lot of other things, namely anything in the control circuit that uses the 24V power. A relay or contactor that doesn't pull in or a defective defrost control, a shorted wire from the thermostat.

I'm wondering if you have what we call a package heat pump meaning the both the indoor blower and out door compressor & fan are in the same section out side? OR is your a split system with an indoor section and an outdoor section?

I'm betting on the split section. In some miss-matched systems (like a Lennox indoor and a GMC out door for example) Some of the origonal Lennox heat pumps had an out door and an indoor transformer. If these trans formers were not "phased" together it could cause a problem like your having. Now you just have it in the heatign mode if I read between the lines correctly. So it makes snece that it's something with the heat. The out door unit can opperate withits own 24v but if you have back up heat inside (gas or electric Im thinking you have electric) the indoor section will come on atfter a few more degrees of heat loss (2-4'F). This is where the transformer inside will buck the one outside and somethjing has to give. The weakest point.

From what ive been told by some of the old hands I've been around if the high volt side burns out look for a low volt problem if the low volt burns out look for a line volt problem.

If this has 2 transformers like I suspect try the fuse on both sides but remember the one is hot and will remain hot all time on 220V or 1 leg of it or it might remind you. To phase these transfoprmers I believe you swtich the main lines L1 & L2 at either of the transformers. Now 1 more thing the indoor section may be using ground on the low volt side as a path for 1 side of the transformer. I believe you will ahve to do same for the other transformer too.

Hope this helps Id really like to know what you find and do.
Please ask more and you give such detail I can follow you with little trouble. Please rate me as high as you can and good luck.

Mar 30, 2009 | Goodman Heating & Cooling

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