Question about Icm 302c 302 Heat Pump Defrost Timer Control Board

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Heat pump defrost board

Unit will not run in cooling mode unless defroas board is bypassed

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Replace defrost board

Posted on Sep 17, 2009

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Does anyone know the location on a heil heap pump/a/c.of the dfrost board

Posted on Feb 24, 2010

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1 Answer

What does df on interior display of pioneer split heat pump system mean?


In defrosting mode, The LED displays “dF” or alternative displays between running frequency and “dF” (each displays 0.5s)
This means the outdoor unit is in defrost mode, heat pumps will initiate defrost upon demand. Its a normal operation code

Mar 01, 2017 | Heating & Cooling

1 Answer

When the heater is on the outside ac unit runs I've temporarily turned off 220 breaker low voltage pull in switch still energized how does the furnace control board fault occur


Are you sure this is not a heat pump. The outdide unit is supposed to run with a heat pump. If its blowing cool air its likely in defrost mode, this has to happen, though you probably have heat strips inside, possibly not wired right.

Dec 18, 2016 | Heating & Cooling

1 Answer

Senville mini split displays a "defrost" symbol????


It's a heat pump and that is how they work. But it shouldn't be cycling so much unless you live in Minnesota? The colder it is outside the more chance that the outside coil will freeze so it will go into defrost. It may be low on charge or have leak as well. Call a tech to verify.

Apr 13, 2014 | Senville 18000 BTU Ductless Air...

1 Answer

Heat Pump Blowing Cold


Unless you just installed or had the thermostat installed recently, I would not point at the thermostat as the problem. With what you have described I would suggest have your units serviced as it sounds like a loss of charge, or failed defrost control board. The "Aux" comes on when the unit is using secondary heating (electric heat strips). That occurs when the demand temperature (what you set it to) in Heat mode is more than the current room temperature, usually ~2-4 degrees higher. Also happens in defrost mode. Defrost is a heat pump cycle that melts any build up of ice on the condenser unit (outside unit). That process is simply the unit running in cool mode which will heat up the outside unit to melt any ice. Defrost cycles vary with manufacture but usually you can tell if is in defrost by looking at the outside unit, during defrost the unit will be warm or hot sometimes there is steam and the compressor will be running but not the fan. Defrost only happens on heat pumps in "Heat" mode. Rheem has a 10 yr compressor and parts warranty, so call the installer or Rheem authorized service company.

Nov 11, 2013 | Honeywell RTH7600D Touchscreen 7-Day...

1 Answer

I have a Rheem rpmc-042jaz heat pump (scroll) that has a bad defrost board (47-21517 - 16) The defrost board was bypassed by a service tech to allow cooling but no heating and I'm now trying to install a...


trace the wiring of the reversing valve.. its an electromagnetic relay in the middle of a cluster of tubing near the compressor. depending on its normal state when un-powered (normal heat or normal cool) the tech may have simply disconnected the relay (normal cool), or connected it directly to the call-for-cool line (typically yellow) (normal heat) regardless of heating or cooling, the compressor always runs the same direction

Oct 31, 2013 | Heating & Cooling

1 Answer

My heat pump is frozen up today and it is 60 degrees outside and I have my heat set to 66 degrees. Is this normal?


You post is not clear as to where the freeze-up is occurring. I'm going to assume the outdoor unit is frozen up.
Heat Pumps don't generally freeze up at 60 degrees. If the ice around the unit has an uneven pattern (for example a thick spot around the center or at the very bottom) could indicate a low refrigerant charge. If the ice is even throughout, it may be one of the following:
*Sticking Contactor*.....turn the system off at your thermostat and check to make sure the unit outside shut off. If it doesn't turn off, it is likely to be the contactor.
*Failed Defrost Thermostat*.....if the defrost thermostat fails "open", the system will never go into defrost.
*Failed Defrost Control Board*......this could also prevent the system from going into defrost
*Failed Reversing Valve*........put your system in COOL mode and check to see if it will blow cold air inside approx 16 - 22 degF lower than room temperature.
*Failed/Failing Condensor Fan Motor*.......ensure the condenser fan motor is running during heat and cool modes. The condensor fan motor will not run in OFF/Satisfied Mode or in Defrost Mode.
I hope this helps. Good Luck! :-)

Mar 05, 2010 | Heating & Cooling

1 Answer

My amana heat pump will start and run momentarily and stop several times, and eventually it works, the house stays at 70 degrees so it works but this does not sound right what's the problem if any?


Hi; I need more info. Do You mean the outdoor unit is stoping and starting while running in a call for heat by the tstat. When heat pumps run if the temperature out side reaches low enough the outside unit will go into a defrost cycle to remove any build up of frost or ice. If the outdoor unit has a dirty coil or a low freon issue this also can trick the unit into a premature defrost cycle. Now here is another scenerio.If Your ac is running in the cool mode and stops prematurly there could be several problems. Low freon level, faulty fan motor causing the compressor to go into a freon bypass mode wich sounds very spewy. Please tell me if you are in heat mode.. Also how old is the unit. Sometimes a severly worn control contactor can disallow all the needed voltage to cross over to Your fan motor and compressor. Watch unit while its acting up... Also when unit goes into a sceduled defrost the fan will stop this is normal and will restart when the unit comes out off defrost You will here this big swoosh sound. Thats the freon being redirected back into the heating path.Let me know...alpharome416

Jan 22, 2010 | Heating & Cooling

1 Answer

Heatpump defrost board


REPLACE THE BOARD IS BAD ALSO CHECK FOR 24 VOLTS FROM COMMON AND RED TO MAKE SURE THE BOARD HAS 24 VOLTS.

Jul 01, 2009 | Icm 302c 302 Heat Pump Defrost Timer...

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

1 Answer

I have Goodman combination heating and cooling outdoor unit PBB series. I am wanting to know if when the heat is on should the fan outside turn or is that only ac


If it's a heatpump, then yes the outdoor fan will turn unless the unit is going in defrost mode. But for the majority of the time a heat pump is operating in heat mode, the outdoor fan is running.

Jan 16, 2009 | Heating & Cooling

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