Old analog chronotherm - clock broken

R= power in G= fan Y= cooling W=heat O= heatpump reversing valve C= common used for clock on chronotherm Usually its pretty streight forward wire for wire. Unless you have a heatpump. The thermostat has to be heatpump compatable. And I ll usually use the 8000 for this. The w and y jumper may not be necesary on the new thermostat as the new one should do it internally once programed as a heatpump thremostat. At least thats how the 5000 and 8000 sreies work. So imagine the 7000 would be the same. You may also have to program the reversing valve operation not all manufactuers do it the same . Some valves have to be powered for heat while others have to be powered for cooling. Good luck

Depends what model number you have. The older models had problems. So Honeywell upgraded the model several times. When you say, cant turn it off. If that means the heat will not shut off then you have no choice to replace it, also if the heat,cool, off,switch will not work it is not repairable. Go to Home depot or menards and pick up a thermostat. Find somebody with some handy man skills and they can replace it for you.

To turn the fan off, press the "fan key" until it says "auto". This will turn the fan off. When the programs scheduled, changes, the fan will go on again. You have to repeat the fan to "auto" each time the schedule changes.

No. The clock is just the set back timer. Pull the battery and use the stat manually.

The outdoor thermostat senses the the temp of the outside air, and adjust the boiler water temp according to what it knows is best. The reason that the boiler is running longer is the old boiler used to be constantly sending 180ish degree water to the baseboard, now that water may only be 140ish degrees. The idea behind this is to reduce off cycle heat loss, as the greater the temp difference between the air temp and water temp, the quicker you loss heat. The theory in boiler run time is this, the less times it starts and stops, and the long run times will give you the best efficiency. Hope this answers you questions.

you are not geting AC power from the furnace

The Chrono Therm 3 and 4's were some of the worst products that honeywell has EVER put out. I would suggest switching to the Vision Pro 8000, please consult your local HVAC company for more information regarding the change over.

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sounds like t-stat is going bad

The two wires from the transformer are to run the clock in the old thermostat. If you connect the two other wires to any heating thermostat, it will work. Don't forget to disconnect the transformer wires. Hope this helps

Not only are the Chronotherm IV's less than user friendly, they have a terrible failure rate. It sounds like one of the typical failures of the chronotherm IV. I suggest starting with a new thermostat.