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Turned on the a/c for the first time this year and no fan. The compressor turns on but no fan. The fan works when turned to heat and t-stat cranked up. This is a BDP CO. 2085C02135. Is there a relay or limit switch that only works with cool?

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Depending on the thermostat you have, there may be an issue there. Some stats have a subbase that controls the fan for AC. I would like to know the model of your stat

Posted on Jun 30, 2009

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Hi, if you have a warning light on your thermostat saying you have a compressor problem, you must have a heat pump. You may have lost the compressor, not knowing the age of this unit, and so on, it makes it more difficult to trouble shoot it. What you can do, is turn it off at the thermostat for around 10 minutes. Go to the out door unit. If you can, this is a Carrier, remove the hex head screws where the 2 copper lines are at and stat wires. It should take a 5/16 nut driver to remove them. You will then see the electrical components, such as the contactor, run capacitor that starts the outdoor fan and compressor. Even with the stat off, don't touch any wires as they are high voltage. With a helper, while you watch the contactor, it will have the main hot wires going into it, and coming out. When the stat is turned back on, make sure the temperature is set low enough or high enough for what ever you are using, heat or cool, and when its turned on you will hear and see the contactor pull in/close to start the fan and compressor. Look all of the wires over good to make sure none are burned off, ect. If nothing happens at all, nothing, go to your main breaker box to see if the breaker tripped. If so, turn it off hard, and back on hard to see if it holds and all comes on. Listen to see if you can hear the compressor running. If the fan is on but no compressor, it may be faulty, or you may have a small time delay relay board that has failed you. These are just things you can check. If the breaker trips out every time, the compressor is more then likely shorted to ground. You will then have to call a service company out to check it.Just follow the steps I have told you and you may solve it your self. Please get back to me, and I wish you the best.
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We gave a Goodmn Hertz 60 Phase I heat pump - installed this summer....worked great for cooling..now that temps are dropping we are needing heat. When we turn it on it comes on but never heats. Think it...


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Hi, it sounds as though you have a faulty thermostat that failed before your eyes. The circuitry in the sub-base has failed. If the stat is set in the off posistion and you turn the fan switch on, just the fan will run. If it is on cool and you turn the fan to on and not auto, it should bring on the compressor. You will need to get a new thermostat. Kill the breaker and remove the cover to the stat and expose the wiring. This is a 24 low voltage stat. It will have terminals rh and rc with a red jumper connecting the 2, and your red hot wire connected to either one.Y, yellow for cooling, G, green for fan control, and white , W for heat control. Y yellow may be using a blue wire instead. They sometimes do this. Write this down and pick up a stat at Home Depot, Lowe's hardware This will solve your problem. Please don't forget to rate me as I know you will be kind. I will check in on you as I keep files on all of problems I have solved to help people. You can also get back to me by my user name below.
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Honeywell thermostat T8400c started flashing, heat/cool was off. Display flashes all icons (heat and cooling icons, temperatures, everything) and on the oppposite flash, the setpoint is displayed. The fan...


Based on the simplicity of this particular t-stat, I really think that it is bad and needs to be replaced. They do not make this particular model anymore. I have included a link to the operators manual for the stat. Good luck!

http://customer.honeywell.com/techlit/pdf/PackedLit/69-1491.pdf

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HELP!! I got a problem with my A/C


I looked at the pdf file page 20 of page 124 for t-stat says for a Y594g1476 to remove the jumper IF W1 is used. I don't know if you have 2nd stage of heat such as electric heat. I would check wiring according to your outdoor unit and indoor unit and the t-stat. At the very least you will need R and it looks like X terminal giving you the 24 volts. for the control circuit. O is for the reversing valve. G for the blower. Y for the compressor contactor. W1 goes to the fan section to operate 2nd stage heat if you have it.You can also remove the t-stat and make sure you have the correct subbase which the PDF file shows for a y594g1476 stat it should be a Q674 series. Also what you can do with the stat off is jump out R to G to O to Y that should bypass the t-stat and bring on the fan and compressor contactor and the reversing valve. ( reversing valve is energized in the cooling mode ) see what happens ,you may have a built in 5 minute timer before it starts.I was unable to find the PDF on your Tempstar. So I am not sure what the outdoor coil temp. sensor is. I know that to initiate a defrost heat pumps use an outdoor sensor strapped on the outdoor coil bend. it usually labeled DFT (defrost thermostat ) but that should only work in the heat mode. Also they may show an OPITIONAL outdoor sensor/stat to stage 2nd stage of heat if using electric heat. But as far as I know that is installed by the contractor and is optional. In closing I would double check the control wiring from the t-stat to the outdoor unit to the fan section. Then I would bypass the t-stat with the method I told you. You can also take it one step at a time R to G blower fan starts .R to O reversing valve energizes. R to Y compressor contactor closes (after 5 minutes).Also the PDF shows an optional outdoor sensor that hooks up to the thermostat. If your handy with a volt meter check that you have 24 volts between R and X terminal at the stat

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