Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Blower will not turn on when a/c compressor comes on - tstat ok fuses ok

Furnace and ac use same blower. Turned furnace off a couple weeks ago as weather permitted. went to turn on a.c, and compressor outside comes on - blower doesn't. When I manually turn limit fan switch, blower comes on, and air is cold, but doesn't stay on. WHen I let off, it turns off.

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You should have a fan relay on your furnace that would control your fan in air conditioning and that sounds like you are needing

Posted on Nov 12, 2009

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Probaly low on freon will not turn on when low

Posted on Oct 05, 2009

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If I shut off the blower on my gas furnace do I have to shut down the whole furnace


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Your tstat is not the problem. I've not yet worked on an oil furnace. I'm way down south. But either way, if your tstat was calling for heat(heat on), and you pushed a reset at the furnace, more than likely that reset is a safety. OK to reset, but now what ever that safety is preventing from happening, has failed and can not be reset until repaired. The reset should be an automatically opening switch upon unsafe operation. And manually closed to "reset" the safety. That safety is connected to something that is not working properly. Hope this helps!

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A/c stopped cooling a couple of weeks ago and now the blowers have stopped working too What could be the problem,all fuses are ok.


For the ac to stop working either the compressor clutch is not getting power or the gas is too low so the low pressure switch has switched the compressor off to stop sucking in air through the leak. The blower is controlled by the fan switch which is a 3 positional switch that has a resistor for each position. These resistors have a habit of burning out so the fan will not work. The resistors are in a block located in the blower housing. So you have two faults to fix.

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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

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Dec 06, 2009 | 2001 Chevrolet Tracker

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I have a Carrier 58SX060 Furnace with air. I turned the thermostat to heat and the exhaust comes on and runs and the pilot comes on but the burner never light s and the blower never comes on. If I turn the...


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Sep 30, 2009 | Heating & Cooling

1 Answer

Inside blower not starting every time


You have a voltage bleed somewhere or a short, whatever you want to call it. Do you have a control board on this unit where the relays are integrated into it or do you have the old type where the relay is separate? Anyway, you need to take a meter and take voltage readings to the motor when it's acting up and when it's running right. I have had the same problem with a Goodman unit before and it turned out to be the tstat! What I would do is remove the cover off the tstat and take a small jumper wire and touch the r terminal to the y terminal. If the motor starts right up, you know it's the tstat. If you have the same problem, then the only thing it can be is a low voltage short to the unit from the tstat, bad control board if you have one, or a bad relay. But if the unit is working fine in heat, it's probably not the relay. I hope this helps.

Apr 08, 2009 | Goodman Heating & Cooling

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