Question about Honeywell TH4210D1005 Heater

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Auxilliary heat just started blowing cold air

I have a carrier 2 ton electric furnace/ heat pump system. I have been running the auxilliary heat for the past 2 years, and it worked fine until last night. Now it blows cold air. I checked the breaker 3 times, by switching it on and off, double checked and replaced the filter, and even shut it off for a while, but still blows cold.

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SOund like you heating element has a open limit or the sequencer is bad. Another thing that it may be is the element wire has broken. Either way it sounds like you need a technician to come out and repair.

Posted on Jan 27, 2009

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Took off back to see filters put back together now wont start. spark,nozzle and fan work it just wont start


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1 Answer

Goodman heating system


It really depends on the type of system you have. You will either have a furnace, high efficiency furnace, heat pump system, heat pump with gas or electric back up heat. All these systems operate differently and the problem that you are having could be caused by multiple issues, depending on which system it is. More info will be greatly appreciated. Make sure to check all filters and air flow first before going any further. The system could be over heating and tripping a limit, causing the system to stop producing heat until the unit has cooled back down.

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MY HEATER BLOWS HOT AIR THEN BLOWS COLD THEN HOT THEN COLD,ICHANGED THE MOTHER BOARD, RELAY SWITCH, AND THERMOSTAT, IT IS RUN FROM A HEAT PUMP WITCH I HAD CHECKED AND IT WORKS FINE


I have a lux electric thermostat my furnace will blow out heat for about one hour to maybe three then it will start blowing cooler air,I then cut it off for thirty seconds or longer once I do that it will start blowing out heat again then it will repeat it self again what could be the problem.

Jan 07, 2010 | Heating & Cooling

1 Answer

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Yes, That is normal for many furnaces, not just the Carrier...
Seems to be a bit dumb but then the ones who desogn these things are sitting behind desks and not out in the field working on them. I'm sure they have a perfectly good reason to have the furnace do that but I have never figure it out....
It does get your attention when the furnace is there running for ever, blowing cold air and burning up your electric....
You just hope that it does not happen when you are away for an extentend period of time...as you said.
Always make sure that if you have someone checking in on your place that they verify the temperature and not just peek in and say yup the furance is running...

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

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I have a Rheem Gas/Electric AC unit that provides both Air and Heat. Yesterday the heat stopped working... it blows out cold air. We've had some cold temperatures lately (low 20's) but this isn't unusual...


Heat pumps provide good heat until the tempurature drops below 35-40 degrees. After that there isn't much heat to extract from the outside air and then either the gas furnace kicks in or the electric heat strip does the job of heating the air. if you have heat strips, I would check your breakers in your panel and sometimes there are a couple of breakers right on the air handler or furnace. The ones that will be for your heat strip are 220v and will be twice as wide as your normal 110v breakers . Please don't trust a visual inspection as they can look like they are in the "on" position but are indeed tripped. Turn them all they way off and then back on. If the beakers check out you may have an open cicuit in the heat strips themselves and you will need to have a qualified HVAC tech look at your furnace to repair it.

If your furnace is a "duel fuel" and uses natural or LP gas for back up heat then your ten year old rheem probably needs a good maintenance by a qualified service tech. There is a flame sensor to clean, ignitor to check (replaces the old school pilots), burners to clean flue connections to check and much more. ALL manufacturers of any heating apliance recommend yearly maintenance. Most companies offer something for around 100 bucks. I hope this helps.

Rocco

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1 Answer

Goodman heats but defrosts turns on before desired temp.


Yes. The defrost cycle of a heat pump is actually turning on your airconditioning to heat up the condenser to thaw it out. During this cycle your electric strip heaters "should" be adequate enough to compensate for the a/c being on. At about 30 - 34 degrees outdoor temp there is not enough heat in the air to to adequately heat your home with the heat pump only. Some technitions will use an outdoor thermostat to turn off the heat pump when it is under 34 degrees outside. If you are to cold when its under 34 degrees intall more electric strip heaters.. But if you do this your electric bill may go up significantly.
Welcome to the wonderful world of electric heat pumps (lol).
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