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Thermastat malfunction need to know what color wires to cross to allow ac to work at thermastat until morning ac isnt on and burning up in tx

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Generally speaking; R terminal to Y terminal on the back plate. However you may have a transformer problem which would not give you power to the R terminal in the first place. Jumpering R to Y should make the outside condensing unit come on if you have power.

Posted on May 08, 2008

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In Fan mode, fan works; but in AC mode, I can hear the normal AC sounds, except the fan never turns on. This is the fan in the lower half of the unit in the inside of the house, which blows the air...


on a call for air conditioning your therrmastat brings the indoor fan on and the out door unit at the same time. Since your fan comes on in "fan" mode, it sounds like you need a thermastat. For temp. cooling just turn your fan switch to "on" and turn system switch to cool and set desired temp. System will cycle off and on but fan will not shut off until fan control is set back to "auto". I suggest replaceing thermastat

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Albert Saavedra
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Need to replace Panasonic AC electrical cord.


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No Power to Duo-Term Thermastat


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RV A/C COMPRESSOR RUNS CONSTANTLY


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Heil airconditioner is not cooling? Heater works


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2 Answers

No hot air


There could be a couple of problems going on. Your fuse on the heater up in the attic is popped.
Your glow ignition is broken.
Your spark ignitor is bad (if that is what you have)
GAs valve is bad.
Or the vent sensor is bad, meaning that the exhaust fumes are not going anywhere.
Now when you turn on the heater your condensiing unit outside should never turn on unless you are calling for AC. Now if the ac is not coming on there can be more problems.
Disconnect fuse is popped.
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1 Answer

Installing thermastat


any wire can go to any terminal. unfortunately you now have to hand trace each onre to the device it powers and hook it up accordingly. a daunting task even for a pro. having said that the installer could have used the normal colrs for the usual wiring if you were real lucky. as a general rule the red goes to the r terminal. the yellow goes to the y terminal. the white on a heat pump usually goes to w2. the green powers the fan and goes to g. usually the changeover valve is powered by the o terminal and that is usually wired with an orange wire. that only leaves two more wires. one is the auxilliary or emergency heat terminal and any color wire can be used for that. it will go back to the airhandler and tie on to the w terminal along with the white wire from the stat on most units. or they may have jumped the w and emergency terminal together and hooked the white wire to both. it will work either way. that only leaves one wire and that is the common wire to the stat taht allows it to light up and think and have power. . most stats need the red and a common to work. you may have bought a stat that works off battery power only but since you are blowing fuses it seems you have a common pulled on one wire that you have hooked up wrong and it is creating a dead short , aka a blown fuse. if you go to airhandler and finf low voltage terminal board look for terminal labeled comm . observe what color wire is connected to it and if that is the wire that goes off to the stat. if it is hooked to common and goes with the others to the stat then thats your common and should be hooked to your stat common terminal as outlined in your install sheet. you can keep replacing those fuses till you get it right or take a chance and use an amp probe and a jumper wire . only run an instant and if amps are 4, 5, 6, amps at trans your wrong. only test an instant or you will ruin transformer.probably best if you get a box of fuses.label stuff make notes and good luck. i have gotten in the habit of using a sharpie pen to make copius notes right on the service panel for me and the next guy.

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Ac heat carrier thermastat model no.hh01ad042


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1 Answer

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