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New t stat installed in the house but unit will not turn on. low volt coil checked. The new T stat says unit should be running auto cool no fan or comp running The unit is a carrier puron

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Some of these thermostats have an automatic time delay of five minutes built into them. Also there are many different thermostats so this is difficult. I would first check to see that Y runs to the outside unit. Also common (probably brown wire on furnace) needs to run to outside unit. If the thermostat has a R and RC both you may need to install a jumper wire that connect the two together. There is probably a fuse in the circuit board looks like an auto fuse. I would check this first of all. (if you bumped 2 wires together while changing the t-stat you probably blew the fuse.

Posted on Jul 12, 2010

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My fan runs all the time...Heat works fine


Check on t-stat that you are on fan auto setting not fan on if you are on fan auto either t-stat failing or fan relay at indoor unit is stuck on .first turn high voltage off to indoor unit go to t-stat and remove wire from
the G terminal should be green in Color.make sure it is not touching any thing turn high volts back on if fan stop need t-stat if fan still runs need fan relay hope this helps

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The contactor for the compressor and outdoor fan is activated by your thermostat when you call for cool. The small coil is an electromagnet that gets 24VAC when you call for cool at the t stat. The red wire in your T stat connects to the blue (or sometimes yellow wire) in the t stat completing the 24VAC circuit and closing the contactor. The line voltage is supplied to the poutdoor fan and compressor upon the contactor closing.

You can manually pushthe contactor close and the outdoor fan and compressor should start. Do this with your hand on the insulated portion of a screwdriver and take the tip of the screwdriver and push the contactor closed. The compressor and outdoor fan should start. That tells you that you have a thermostat to contactor coil issue if the t stat does not close the contactor when you call for cool.

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1 Answer

Fan runs on outside unit, but no air blows in the house


Listen for the motor if its sounds and thou its running it probably is, the indoor coil could be iced up, if so turn on the fan and turn off the cooling and let it thaw out. Check the air filter and coil that they are clean, setting the stat to low below 72 degrees would cause the coil to frezz as well. If motor is not running, it could be bad, but there are onther things that could be causing it to not run.

Jul 04, 2011 | Bryant Heating & Cooling

1 Answer

Just blowing air not cooling, outside unit doesn't seem to be working but inside just blowing air


First off, check power:disconnect box outside may have fuses,then check power at fuse box.If you have power(220 volts) then check for 24 volts at T-stat line.Also, make sure T-stat is set to A.C.With power on go outside and listen to condenser unit.If fan is rotating listen for humming .If it is not running, it could be a bad contactor or a bad or capacitor .If it is running check after 5+ minutes if warm air is coming out of the outside unit.Also, wash the condenser unit:start by spraying the hose about 45 degrees downward ,going side to side,and down on all sides.Do Not use High pressure hoses,it will bend coil fins.After it runs for about an hour,or so, go out and see if low pressure line(big one) is sweating and cool, and high pressure line (small line) is warm.

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1 Answer

No heat or cool on my payne heat pump


If you can manually push in on the contactor and the fan runs, your not getting 24 volts across the contactor coil.
If the contactor is not energized, your compressor want be running, the contactor controls the fan and compressor.
You need to measure the voltage across the contactor coil and if you don't have 24 volts then you need to either jumper the pressure swiches or measure the voltage across the pressure switches if you read 24 volts then they are open.
If low pressure switch is open you are probably low on refrigerant, if high pressure switch is open it's bad.
If these check out ok then you might check the low voltage wires for loose connections or the wires from unit back to house and under the house to see if there's any breaks or insulation chewed up from lawn mower or animals.

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1 Answer

I have an intertherm electric furnace FEH-A020, with multispeed blower installed when A/C added. My problem is blower operation. at the end of the cooling season with fan set to auto operation the fan ran...


The model of T-stat you gave comes up as a discontinued model on Honeywell's web site, but it looks to be a manual stat that type of stat would have to be wired with a summer winter switch with electric heat, allowing it to turn on the fan with a call for heat. If yours is a programmable T-stat you would need to select electric heat or in the installers set up change the default setting for fan from unit controls fan in heat to thermostat controls fan.

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first look for red button neer the copper line set if has one push it second inspect thermostat wires for weed eater damage check disconnect for fuses check breaker at main panel pull disconect and remove cover check stat wire connections look at the capacitor if swelled up on top bad if all look ok put disconect in using insulated object manually push in contactor if unit comes on check for 24 volt ac on yellow stat wire to common if none stat wire could be loose at indoor unit or stat bad hope this helps you

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1 Answer

Inadequate cooling on walk in freezer


YES GOOD ADVISE . ALWAYS START WITH THE BASICS. IS EVAPORATOR COIL CLEAN AND CLEAR? ALL EVAP FANS RUNNING? DRAIN PAN CLEAR? IS STAT CALLING FOR COOL? IS OUTDOOR COND COIL CLEAN? IS OUTRDOOR FAN RUNNING WITH NO PLAY IN BUSHING? DO RUN AND START CAPS TEST GOOD? DOES CONTACTOR LOOK GOOD? THEN TRY TO CATCH UNIT WHEN TEMP IS ABOVE DESIRED SETTING. FIRST TEST STAT. IS IT OPEN OR CLOSED? IF BOX IS HOT AND ITS OPEN THEN PROBLEM IS STAT. IF STAT IS CLOSED AND OUTDOOR FAN IS NOT RUNNING THEN COMPRESSOR PROBABLY OVERHEATING WHEN FAN QUITS. CHECK FOR VOLTS TO FAN GOT VOLTS? FAN IS BAD. NO VOLTS? TRACK BACK TO SOURCE OF POWER ( CONTACTOR) AN R22 BOX AT 52 PRESS IS NOT TO BAD ON START UP ON A HOT BOX BUT COULD BE HIGH ON 502 408 OR R12 STUFF TYPE OF REF IS DEFINITELY IMPORTANT. GOOD LUCK

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1 Answer

I have a carrier infinity system. On the thermostat it reads "sens error" where the outdoor temp is normally displayed. The inside unit is running but the outside unit is not. Any suggestions?


A burned or pitted contactor will/can cause a unit to not run. Outside fan. Just thinking out loud. Start with low voltage check at t.stat then check outside low volt. Set t.stat to on. If fan engages at least your transformer is good. Next set calling for cool. Drop t.stat 68-70. If nothing happens go outside and with a screwdriver depress the contactor in. If fan and compressor kicks in change the contactor. If contactor is pulled in check outside fan. Remove the wires from the compressor and see if the fan will run . If it does you have eliminated start components as good. The compressor has to be check. It needs to be ohmed out. Turn off power at disconnect. Pull the cover on the compressor. Check between pins; then pins to ground. Open or infinite is good.Have you checked fuses. Like small 3-5 amp fuses

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