Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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I have installed a Honeywell CT8775C, when I put it on the heat the A/C goes on!! I have checked my wiring and everything looks right? what should I do to correct it.

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You should have a minimum of four thermostet wires. The red wire goes on the R terminal. White wire on the W terminal. Green wire on the G terminal. Place the yellow wire on the Y terminal. In most cases NO other terminals are used...... IF YOU DO NOT HAVE A YELLOW WIRE...... place the blue wire on the Y terminal. This should hopefully fix it. IF NOT....See if the thermostat has a RH and a RC terminal. If so I'll bet that you put the red wire on RC ternimal. this is for airconditioning ONLY. The RH terminal is for heating ONLY. Put a small jumper wire that will connect RH & RC. Then this should solve your problem.

Posted on Mar 08, 2009

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Posted on Jan 02, 2017

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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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