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Need a defrost control board for a Carrier heat pump Model # 990-197-10

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6ya6ya
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Posted on Jan 02, 2017

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shastalaker7
  • 1515 Answers

SOURCE: Carrier heat pump is icing up and doesn't seem to

Hi, On this model of heat pump, you will have a defrost board with termination times on the face of them. There will be 1 wire plugged into one of the times, such as 15 min., 30 min., and 45min. I just wanted to let you know this and this is what determines the start and stop of defrost. You also could have a defrost timer/ defrost relay and will have a defrost thermostat located on the liquid line on the condenser coil that will also start this process if needed. This is called time and temp. defrost. On the board, there is a test point on it and will tell you on the schematic how to test this board and put it into a defrost mode very quickly just by pulling a certain marked wire plugged onto a pin and placing it on a different marked pin. This way the service tech doesn't have to set and watch for 45 min.This you can try and see if it does go into a defrost mode.If you can manually put it into a defrost, you will need a new board, as it is not going into defrost in automatic.If it doesn't, you also have a faulty board. Being that heat-pumps have so many components on them, it is difficult to walk you through all components.Heat-pumps also have 2 TXV on them (metering devices) that meter freon into the coils 1 for heat and 1 for cooling.When you are in the heat mode, the condenser coil becomes the evaperator coil with the use of the reversing valve.What actually defrosts the coil, is when it goes into defrost, the reversing valve goes into the cooling mode sending hot gas to defrost the coil.You can try and check the board if indeed it is new enough to use a defrost board and not a timer.You can look through the window of the timer also if the unit is older to see if it is moving like a clock.If not, it is more then likely your problem.You will know when it goes into defrost as the steam from the melting ice starts to rise the unit appears to be on fire. I have had calls on this. The condenser fan also stops during defrost. A faulty TXV or expansion valve as I mentioned early on if plugged or not metering can cause this also. So, I am telling you there are some things you can check on your own, and without the proper tools and freon gauges, it would be very difficult to check every componanent without being onsight. Carrier has been around for many , many years and there units are of very good quality as is Day & Night And Bryant. But, check to see if you have the board, and if you can do the tests I have asked of you. A board can be ordered on line or purchased at an appliance parts store. Please let me know what is going on with your progress. Sincerely,
Shastalaker7
PS (9 times out of 10, the defrost board is at fault or timer which ever you have.These units are difficult to trouble shoot without being onsight. Good Luck, and please let me know.

Posted on Dec 07, 2009

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vanni7
  • 163 Answers

SOURCE: 3 amp fuse blows on a carrier 58mcb furnace board

Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

Posted on Jan 04, 2009

  • 262 Answers

SOURCE: heat pump condensor freezeing up

DID YOU CHECK THE FREON ALOT OF TIMES IF THE SYSTEM IS LOW IT WILL FREEZE CHECK THIS BEFORE GOING ANY FURTHER SPENDING MONEY

Posted on Jan 12, 2009

co7196
  • 3433 Answers

SOURCE: HEAT PUMP PROBLEMS

Defrost cycle is to allow frosy or ice to melt down and not restrict the output air. The thermostat is set too low and in high humidity ice forms quickly restricting the air flow. tur up the thermostat and let the room cool gradually.

Posted on May 27, 2009

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Need heat pump wiring diagram for carrier 38yka030300


All Carrier has on this is installation instructions & field wiring. If your heat pump is freezing up, then check your defrost board to see if the timing jumper for checking the freezestat is set to 30,60, or 90 minutes. If it is set to 90, then set it either to 30 or 60 for the board to check the freezestat more often to go into defrost. Then again, the system could be a little low on refrigerant.

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During heat cycle the entire heat pump frosts up and won't go into defrost cycle.


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I have a goodman heat pump model# ssz140301 where is the defrost timer located on the heat pump


In the out door unit, Remove to cover there should be a control board in there defrost time is usually adj by 30,60,90 min settings on the board. If is freezing up try to adj time or the unit could have a bad sensor or control board.

Dec 30, 2010 | Heating & Cooling

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I have a Carrier Heat pump that is iceing up in cold weather and not defrosting properly. Where is the switch to decrease the time between the defrost cycles? I understand there are 3 settings prossible...


switch for defrost is inside condenser your options are usually 30, 60, 90 minutes. you can not decrease times between defrost it is determined by a coil sensor it senses ice on coil and puts unit into be aware that heatpumps are only effecient down to certin temps.the switch you describe is length of defrost.

Feb 11, 2010 | Carrier 38CKC042 Air Conditioner

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Heat pump shut off 1 to 2 minutes, service yesterday for same problem told low on freon. Added freon, worked fine until it went thorugh first defrost, now back to same thing. Tech says compressor not...


It is possible that you have one or a combination of a few different problems here.

If your heat pump will not come on but the air handler works, the first thing you want to check is that the circuit breaker and disconnect for the heat pump are both on.

The next thing to check is that the heat pump is receiving a call for heat from the thermostat. If there is no call for heat at the heat pump, then your problem is most likely a low voltage issue. This could range from a failed thermostat to a low voltage wire that is bad.

If your heat pump has high voltage supplied and there is a call for heat present with no heat pump running, you are going to be isolating the problem to the heat pump itself. The problem could lie within any of the electrical components in the heat pump from a bad capacitor, a failed contactor, or a failed defrost control board.



Jan 07, 2010 | Carrier Heating & Cooling

1 Answer

Carrier heat pump is icing up and doesn't seem to be defrosting.


Hi, On this model of heat pump, you will have a defrost board with termination times on the face of them. There will be 1 wire plugged into one of the times, such as 15 min., 30 min., and 45min. I just wanted to let you know this and this is what determines the start and stop of defrost. You also could have a defrost timer/ defrost relay and will have a defrost thermostat located on the liquid line on the condenser coil that will also start this process if needed. This is called time and temp. defrost. On the board, there is a test point on it and will tell you on the schematic how to test this board and put it into a defrost mode very quickly just by pulling a certain marked wire plugged onto a pin and placing it on a different marked pin. This way the service tech doesn't have to set and watch for 45 min.This you can try and see if it does go into a defrost mode.If you can manually put it into a defrost, you will need a new board, as it is not going into defrost in automatic.If it doesn't, you also have a faulty board. Being that heat-pumps have so many components on them, it is difficult to walk you through all components.Heat-pumps also have 2 TXV on them (metering devices) that meter freon into the coils 1 for heat and 1 for cooling.When you are in the heat mode, the condenser coil becomes the evaperator coil with the use of the reversing valve.What actually defrosts the coil, is when it goes into defrost, the reversing valve goes into the cooling mode sending hot gas to defrost the coil.You can try and check the board if indeed it is new enough to use a defrost board and not a timer.You can look through the window of the timer also if the unit is older to see if it is moving like a clock.If not, it is more then likely your problem.You will know when it goes into defrost as the steam from the melting ice starts to rise the unit appears to be on fire. I have had calls on this. The condenser fan also stops during defrost. A faulty TXV or expansion valve as I mentioned early on if plugged or not metering can cause this also. So, I am telling you there are some things you can check on your own, and without the proper tools and freon gauges, it would be very difficult to check every componanent without being onsight. Carrier has been around for many , many years and there units are of very good quality as is Day & Night And Bryant. But, check to see if you have the board, and if you can do the tests I have asked of you. A board can be ordered on line or purchased at an appliance parts store. Please let me know what is going on with your progress. Sincerely,
Shastalaker7
PS (9 times out of 10, the defrost board is at fault or timer which ever you have.These units are difficult to trouble shoot without being onsight. Good Luck, and please let me know.

Dec 07, 2009 | Heating & Cooling

2 Answers

Tempstar heat pump: want to bypass defrost thermostat


Don't attempt to bypass defrost mode. If it's cold enough to use as a heat pump, it's cold enough to need the defrost cycle.

It sounds like a sensor issue, although it may be the controller board.

Unless you know how to work on equipment like this, I urge you to get a professional to service the unit for you.

Jan 22, 2009 | Heating & Cooling

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