Question about Rheem 4 Ton Air Handler - RHLLHM4821JA

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My air handler fan does not come on, the outside unit turns on fine. Is their a way to reset the fan?

Had a power outage last night and the unit turns on outside and the coils in the air handler freeze so its just the inside fan that does not kick on...Is their a way to trouble shoot this?

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  • Rheem Master
  • 1,243 Answers

Check for fan operation by turning the fan control at the thermostat to "on". If the fan blows, it works. If not, check a circuit breaker or fuse.

If the fan blows when forcing it on with the thermostat but not in automatic, check the fan control circuit in the air handler. Danger: high voltage, beware! There should be a system wiring diagram inside the air handler somewhere.

Posted on Mar 30, 2014

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I have an older trane twe030c140b0air handler and it was workingq fine then today froze. Fan in unit will not run. Sparks from conteoller. Is that the correct name? Unit is 208 thanks


Turn power off to air handler. Jump red and green inside the machine. Turn power on. If fan runs then the problem is likely outside of the machine, that being tstat or tstat wire.

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You didn't mention if you checked for 115 volts at the power supply to the air handler. The unit outside has its own power supply. A lot of times the switch that is on the wall doesn't like to work after its been turned off and back on for service, also check the blower door safety switch. If the blower door hasn't been put back in place properly and snugly it will kill power to the whole air handler. Hope this helps. Good luck

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Unit exactly one year old. Was interruped by lightning strike last night. Afterwards air handler blowing, but not cooling? Turned unit of at temostat, waited a few minutes, turned back on and unit (both...


Marion, if there was a lightning strike and then a power surge when the power came back ON, I don't doubt what the servicemen had to say. The age of the unit plays no role in it, when something like this happens. Power surges can be killers to electrical appliances. That's why it always wise to turn the unit off during a power outage. Just ask anyone who was in Irene's path a couple of weeks ago. Power went out for days & weeks for some, when it came back ON, electrical appliances were damaged or ruined or started house fires.

Hope this helped you and thanks for choosing FixYa.

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Our air conditioner stopped cooling last night. The fan runs. My husband pushed the reset button on the outside unit but didn't know if he is supposed to keep it pushed in or just push it in quickly or...


If it is a split unit this is a unit with a furnace and air handler inside with the condensing unit outside. If your inside fan is running ck your outside fan and seeif it is running. If it is it is probably the wires to the capacitor or the capacitor its self. Some capacitors have 3 wires this is a dual capacitor with a 5uf for the outside fan and a 35up for the compressor. on some there are two seperate capacitors one 5 one 35 uf. also it could be the wirng to the capacitor they will be melted and chared. all of this is located in the outside unit where the elect wires go into the unit you can removethe shell but first disconect the power there should be a disconnect switch near the unit. if not trip the breaker. be carefull with the elect.

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Check the starter capacitor, and di you remember to add oil?

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Air conditioner compressor runs for about 1-2 min, then cuts off


well when u have outages the voltage drops obviously, the one that suffers are the capacitors the capacitor for the compressor might need to change, change it with the same capacity as the old one example if labels say 55 microfarady ( mf ) ( 55 mf ) get one of the same I am not saying it is a 55 mf capacitor vary depending on motor and brand. So check the label

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ok it unit is a central I'm suspecting a voltage transformer is defective you see these units need 24v to turn on certain components but if your air handler turns on, your getting 24v to the fan relay, the problem would be elsewhere. if your handy with a volt meter open the thermostat(if applicable) put the meter on ac volts and measure to see if there's 24v between the R and Y terminals

if so your cooling contactor is defective. (If you get 24 v and unit outside dosen't turn on) if there isn't some fuse on the air handler control board blew out.

you can e-mail me @ hvac.tech7872pr@gmail.com if you need more info

Jun 16, 2008 | Ruud Heating & Cooling

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