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Air handler fan not working

I have a 5 ton rheem package heat pump that has been working fine. It is 3 yrs old. Now the compressor runs but the internal air exchange fan does not come on.

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  • Dan Todd May 11, 2010

    Checked ALL the breakers? Checked the dry fuses in the little box outside for continuity?

    Sometimes the fan switch on the thermostat gets stuck. Try turning it "on" and see if it runs. If it does, switch back to automatic.

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Check the fan relay switch in the air handler.
Check the fan motor capacitor.
Check the fan blower wheel for binding.

Posted on May 25, 2009

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Had 16 xi Trane heat pump installed 3 years ago. It ran well for the first couple of years. It began to stop heating and would blow cold air only. Have tried both aux heat and reg. heat to run and neither...


That's a complicated system that needs a qualified technician to service it. Lots of people can install them and they run fine, for a few years. Your indoor unit, operating on 2 heat elements, will feel like its blowing cold air even though its heating, just not so well. And not like you are accustomed to. Each element (5kw)=22.7amps, on average. So 3 elements operating should trip a breaker. Its probably been operating on 2 heat element plus the heat pump. And now you have trouble with the heat pump. If you can't TRUST the guys working on your equipment, try someone else. A second opinion. Normally a 3 or 4 ton unit will have 15kw heat installed, heatpump or not. 5 ton, 20kw. If yours is a 3-4ton, cooling, the 100amp(or normally two 60 amp) breaker should have been installed upon equipment change out. If yours is blowing cold all the time, something is wrong with your heatpump. The electric heat inside operates only when the heatpump can't keep up(real cold outside), the heatpump is in defrost(then it's actually in cooling mode), or if you have the tstat in aux/em. heat. Try a local trane dealer? Of a technician with 15-20 yrs under their belt. A trane dealer should have trane tech support also. BIG HELP!!!

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You may want to check your wiring to see where the outside unit gets its power. Theres nothing inside that can draw 13 amps. That almost has to be the compressor power wire.

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My 5 ton Goodman Heat Pump won't go into heat or ac mode. Fan won't turn on. No noise from compressor. System is 1 1/2 yeras old.


Easy: Turn the "fan" switch to on at the thermostat and see if the blower starts. If no start, check breaker at breaker box. Check service disconnect at or near the air handler. With the breaker and/or service disconnect OFF check the 3 or 5 amp fuse inside the top cover in the air handler.
Not so easy: (You must know what you are doing for this part or let an HVAC Tech do it for you) Open thermostat and firmly jump the Y and R terminals to see if you get the compressor to start for no more than 30 seconds. (don't do it more than once.) Jump the G and R terminals to see if you get the blower to start. If so, u have a bad thermostat. If not, check the transformer inside the same cover in air handler for proper voltage. (24V. Make sure you also get 220 on the opposite side of the transformer)
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1 Answer

4 ton rheem 3yrs old thermostat


It is possible that the relay in the thermostat for "cooling" has gone bad. The relay that runs the blower is different than the condenser relay. Check that you have 24v AC coming from the t-stat to the "y" terminal at the air handler. That same "y" wire should go out to the condenser, make sure then that you have 24v out there. If you have 24v at the condenser then see if the contactor is pulling in. If not then you may have a loss of charge switch that is stopping the current to the contactor. See if you have 24v to the coil of the contactor. If the contactor is pulling in and power is going to the compressor then the compressor has failed. If this is the case the condenser fan will be running but the compressor is not. If neither the condenser fan or the compressor is running then you have a problem in the 24v circuit, which could be a bad wire or a safety switch.

As you can see there are a number of possibilities for your problem. You will need to methodically go through everything to eliminate the possiblities till you isolate the problem,

I hope that this will help you to solve your problem and get you cooling again!

Thanks for using Fixya!

Heatman101

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