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I HAVE A TEMPSTAR FURNACE AND IT RUANS FOR A WHILE AFTER A CALL FOR HEAT BUT 5 MIN, INTO IT THE BURNERS GO OFF THEN IT RESETS ITSELF AND IT COMES BACK ON FOR ANOTHER 5MIN, PRESSURE SWITCH IS GOOD/ NO OBSTRUCTIONS IN THE FLUE/ THERMOSTAT IS GOOD.I WOULD LIKE TO CHECK LIMIT SWITCH BUT I CAN NOT FIND ONE?

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When the flames come on the control monitors the resistance inside a probe called a flame sensor. Of time carbon builds up on that sensor probe and the resistance does not read. When that happens the dang control shuts does and retrys to get confirmation of ignition. Get the sensor off there and clean it up with a dry brillo pad or sand cloth. Re install and check operation.
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Posted on Apr 06, 2011

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Just installed a used tempstar nulk075dg03 turned on power and the blower fan wont shut off. turn the thermastat asking for heat the blower motor goes off and the glow comes on the fire lights for a c


its wired up wrong somewhere try to bypass the thermostat wires at the unit and confirm the unit works
then youll know more
other than this i would consult the installation guide and user manual first ...!!! get them from the makers site some makers manuals are not on the general google type search but readily available from the makers site

Dec 21, 2014 | Fasco Intercity Heil / Tempstar Furnace...

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Tempstar DC90 willnot shut off


I can't stand the tempstar smart valve! Now I'm not sure what a dc90, but if you have a gas fire residential furnace I know what it is. The smart valve controls gas and flame proving only. The blower issue is probably one of the high temp safeties that has stuck. During a call for heat, your system verifies that all safeties are closed. If this sequence is not correct, then the unit assumes that the unit has overheated due to a high temperature safety issue, and brings the blower on to cool it down, normally for 90secs. Also if the unit is calling for heat when the power is turned off, still calling for heat when power is turned back on(like you said by throwing the switch), this will also bring the blower on for 90sec, then blower will/should turn off, and the heat cycle will start. So if your tstat is calling for heat(heat on and set temp higher than accrual temp), and you turn off power then turn power(main voltage) back on, this will bring blower on for 90secs. Now, the burners staying on is a different issue. I've not seen that in 15 yrs of service on a smart valve. There is probably 24volts feeding the "W" circuit, for some reason. On the control board there is a terminal block with R W G Y C. The W is your heat. This W receives a 24v signal from your tstat. Turn off power, remove W from the board, then turn power back on. If no heat then you've isolated your problem to the control wire coming from your tstat, or the tstat itself. If it continues to heat with W disconnected then its something in the furnace, circuit board? Hope this helps!

Mar 04, 2017 | Null Heating & Cooling

1 Answer

We have a tempstar down draft furnace. 2 years ago the heat exchangers where replace because we were told they were cracked. This year the downdraft motor was makikg a lot of noise & we were told the...


Sounds like the low limit or high limit is out these control the fan motor.They are usually set to kick on around 150 degrees and set to go off around 95 to 100 degrees. Over heating does happen with cracked heat exchangers and it can possibly take these two items out. Normally your furnace should run approximately five minutes or a little less then your fan motor comes on and then for cooling down burners should drop and the fan motor should run again roughly five minutes or so then shut down. Times may vary as to your settings.

Dec 20, 2010 | Heating & Cooling

1 Answer

Have a miller furnace. and when i light the pilot, and turn on the furnace. the combustion chamber comes on. it blows out the pilot whats the issue please help no heat.


if the pilot goes out before the fan comes on then your heat exchanger is plugged . if it goes out when the fan comes on then you may have a cracked heat exchanger. it also could be dirty burners with a delay. is there nd slight poping on igintion see if cross overs on the burners are dirty

Nov 25, 2010 | Heating & Cooling

1 Answer

Our power went out and now my furnace does not light but the fan runs. Could there be a problem with the igniter?


You problaby tripped a reset, if it was running when the power went out, the blower would stop, so the heat builds up and trips the resets.
They are programmed to default to blower on when it comes back on, to cool the heat exchanger. Depending on the brand and model, there will be 2 to 4 limit switched, one by the flue pipe, some by the burners and one on the front of the furnace, just above the burners, that one should have 2 screws in it, remove them and pull it out, this one has no reset, you need to ohm it out, if it is bad, replace it.
Have a great day.
Paul

Mar 14, 2010 | Comfort Zone CZ-800 Heater

1 Answer

My tempstar furnace will not light


look for the fot surface ignitor . it has probably failed and will require replacement. it will be located in or about the burners ( in center ) . or to left of center .. do not touch the ignitor when installing ..or bang it on anything . they break easy. mm

Dec 12, 2009 | Jackson 25 in. TempStar HH-ST...

2 Answers

FURNACE CYCLING ON AND OFF ..


I would check furnace filter first. If that looks good i would check the thermostat. To check thermostat turn power off to furnace then take thermostat off the wall and connect wires labbled R & W together then turn power on and check furnace to see if it runs for more than a couple of minutes. If so install a new thermostat. If that doesn't work let me know and i can give you a couple more thing to try.

Jan 17, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace burners wait too long to come on


Sounds like the burners need to be removed from the furnace and cleaned thoroughlyto help with gas distribution if these are in-shot burners they look sort of like an air plane, they have a cross over tube on each side of each burner and if that is rusted up the gas will not distribute evenly from one burner to the next if the pilot and burners go off at the same time then it sounds like you may have some flame blow back maybe due to soot build up in the heat exchanger. Overall sounds like your furnace could use a good servicing

Oct 03, 2007 | Heating & Cooling

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