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I'm having a problem with my heating and air system, my heat only works on emergency heat ( and run 24/7) if i turn it to regular heat it only blows cold air. i dont think my outside unit fan is turning( i could be wrong about this one) how can i fix this problem so i dont have to run my emergency heat all the time

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If your Heatpump's fan isn't running but your compressor is, your fan motor is out. If nothings happening at all ensure your getting power to heatpump (ex: breaker tripped, fuses blown on outside power switch, or fuses blown in breaker box?)

Posted on Dec 04, 2008

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It's could be the board or a heat relay. See if you have 24 volts on "x2" im assuming, emergency heat when in cool mode if so it's the board. Or unhook black or x2 or your emergency heat from board and run unit in cool. If heat stays on its a relay

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Wiring Examples and Instructions
How-To-Wire-It.com
Basic or Common Connection Points
Terminal Colour Signal-Type Description C Black 24 Vac Common Common side of 24 Vac Transformer See Diagram below R or V red 24 Vac Transformer Power Power side of 24 Vac Transformer See diagram below RH or 4 red 24 Vac for heat 24 Vac power before heat switch see diagram below Rc Red 24 Vac for cool 24 Vac power before cool switch see diagram below Y Yellow switched power (cooling) Signal to turn on cooling system see diagram below W White Switched power (heating) Signal to turn on heating system see diagram below G Green Switched power for fan Signal to turn on fan (forced air) see diagram below
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1 Answer

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It sounds like you have a "setback thermostat" A control intended to increase efficiency by allowing the fan to run for an adjustable amount of time after the heater turns off, whether the heater is electric or part of a heat pump. If the "setback" time is too long, the element will cool off and the fan will blow cold air. Try and locate the instructions for the thermostat and see if the "fan run time after heat turn off" is adjustable and reduce it by half. Most emergency heat circuits bypass control circuits (its an emergency, you know), and require manual control.

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1 Answer

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the switch is on your thermostat - look for something that says "system" or "Em heat, heat, off, cool" switch it to "cool" and enjoy. If that doesn't work, call a HVAC service tech. You could have bigger problems than just the system switch. Good luck

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It sounds like the coils are fine if you are getting heat. They are likely shutting down from overheating after being on for awhile. Check your filter and overall air flow to make sure it's adequate.

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1 Answer

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1 Answer

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Does the air handler take a minute or two to start, this would be normal so that it doesn't blow cool air into the house before the unit is warmed up. If not could be the fan relay is weak and needs replacing. As far as the outside unit it sounds like you need to check the refrigerant. In cooling they are 70/150 psi. This should be checked in cooling mode, once you turn it to heating mode the pressures switch bring heat inside the house instead of out. I hope this helps.

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