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Hey we have a Multi-Position Air Handler Electric Heat Model #BCZ36B12C15A-2 that just stopped working no heat, no air, nothing. thermostat will not even show on... what does that mean? and how do I fix it?

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  • carl carpenter
    carl carpenter May 11, 2010

    could be a low voltage problem if no voltage t-stat will not work or the relay componets as well.

  • Stephen Evans May 11, 2010

    have you checked the circuit breakers? sounds like no line voltage. There may be a breaker at on in the unit itself also. Steve

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  • 52 Answers

No low voltage look for blade or glass fuse blown

Posted on Aug 29, 2009

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Heat pump compressor/fan/air handler runs heat for 30 secs, then all stop. (Trane XR 11 HP w/honeywell T8411R thermostat). Capacitor good, new 5-2-1 hard-start kit added but didn't solve problem.


Sounds like low pressure. Are you losing low voltage to condenser? Backup heat not working likely due to a setting error or possibly a wiring issue.

Nov 14, 2016 | Heating & Cooling

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What cause 3 amp fuse to keep blowing when power in turn on goodman air handler


The 3 amp fuse is in the red low voltage (24 volt) thermostat wire
and only gets power when the thermostat is set to turn on heat or a/c It should be connected to the red wire from the thermostat

Nov 13, 2014 | Goodman Manufacturing Goodman ARUF48D14...

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Not hot air


One of three issues
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HE heat pump won't talk with old air handler?


The fact is, the air handler supplies the voltage, blower, and electric heat. In order for the heat pump to work correctly, the wiring from the thermostat and heat pump need to be hooked up right to the air handler. The thermostat is what tells which component to come on. If the fan stops, but the condenser keeps going, you either have a faulty fan relay on the air handler, faulty thermostat or wiring, faulty wiring at the heat pump, or the contacts on the new unit are sticking, which is highly doubtful considering it is working now. I hope I have helped you understand this a little more. Good luck and don't let them push you around, get someone that knows what they are looking at.

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I'm installing a Honeywell Thermostat RTH2410. In Step 1 you need to identify the system type. I have a Carrier Heat Pump model FA4BNF030. Is this a heat pump with or without auxiliary/backup heat?


Auxiliary heat is electric heat that is put into the air handler on the inside of the house. Its used when your heat pump doesn't provide enough heat, but heat strips are not always used. To see if you have auxiliary heat, look inside and see if you have breakers on the front panel of the air handler or anywhere close. No breakers, no electric heat. Hope this helps!

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I have a Ruud air handler and i'm trying to use a


The 44360 tstat can be used for single stage Heat pump use only. Unless you are in an environment that has greater than 40 degF outdoor temperatures year-round, you will want to return that tstat and obtain a multi-stage Heat Pump tstat. The standard system is 2-stage......1st stage is Heat Pump Compressor and 2nd stage is the backup electric heat.

Hope this helps. Good Luck. :-)
http://www.hunterfan.com/uploadedFiles/Support/Downloads/42710.pdf?n=149

Feb 21, 2010 | Heating & Cooling

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What does aux mean on a honeywell Thermostat? the heat doesn't seem to be working but warm air is comming from the vents and the heat pump fan is spinning just not enough to match the temp. it's set too....


The aux switch is for electric heat banks installed in the air handler. Depending on the outside temp. it may not be efficient to run in heat pump mode but in aux. or emergency would run the electric heat in the air handler.

Dec 11, 2009 | Goodman Heating & Cooling

2 Answers

My air handler comes on ,not the outside unit when my thermostat is in the off position even if i turn the thermostat down to 50 and have it turned off the air handler comes on for about 5 to 10 minutes...


If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...

Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

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