Question about Fujitsu 18C1 Air Conditioner

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ASTA18LCC inverter heatpump constantly de-frosting even if temp

Outside is above zero celsius. Did it one afternoon when outside temp was +7deg celsius.

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Usually if a Fujitsu is undersized for the area it is heating, it will defrost alot. Moreso the colder it gets as well.

Posted on Sep 17, 2009

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Posted on Jan 02, 2017

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How do I reset the temp my heat pump switches from electric to gas. It runs much more economically on electri than on propane. The thermostat is a Honeywell th8000. Code 350 setting I believe. Thanks


Heatpumps are more complex than an AC unit. Yes, there is a difference between a heatpump and an air conditioner. Where the real difference lies is out side in the condenser unit. There's a defrost board out in the unit, and depending on the brand and model, one of the wires will need to be changed so that the gas furnace will not come on. The problem with this, heatpumps use the heat that is available from the outdoors and transfers it to indoor. When the temps outside drop below 50 degrees, there's not enough latent heat to transfer, thus calling the propane furnace to operate. Without the addition of the furnace, you will not be able to heat the area properly. The only way to remedy this, is to remove the propane furnace and replace it with an electric airhandler with a heat strip for "emergency heat". The emergency heat term is used when the temps drop below the temps I mentioned above and calls for the heat strips to come on.

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Error C4 or CA


Turn off the heatpump. Start it again when temperature gets hotter than -20c.... Error C4 or CA (overheated compressor) often strikes after C2 error (and this error you often get when temp is belov -25c)
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Hello, I have a 1.5 ton rudd ac/heat pump


Your outside unit is not defrosting. You need to call a service tech to check it out. Defrost board sensor or low on gas. Also you amy have an outside tstat that is not working correctly. Rus

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The fridge should be just above freezing, maybe 2 or 3 degrees celsius. The freezer should be around -15 degrees celsius. The outside temp doesn't matter as far as the settings go.

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Outside unit freezing over


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