Replace battery The "replace battery" sign is on and the air conditioner has nothing on the display screen. Regular air is coming out of the vents, but not really cold. How do I change the battery? Is that even the problem? This is a Honeywell product.

According to the owners manual - -
To turn on the screen, push the "SETTING", trip
control, air conditioner (except rear window defroster
button) or audio button.

There's nothing in the book about special instructions should the battery be disconnected, so if the screen will not come on I would guess a fuse or something happened to the power source.

Air Conditioner No air coming from air conditioning vents

1. Check the air conditioner fuse and replace as necessary.
2. Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
3. Air conditioner low pressure switch defective. Replace switch.
4. Air conditioner fan resistor pack defective. Replace resistor pack.
5. Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary.

Check power to transformer (220volts---24/12volts Dc) which leads to function PCB. If 24 or 12 dc is o.k, then you have replace PCB only.If no output of DC, replace transformer. Thanks.

No air coming from air conditioning vents

1. Check the air conditioner fuse and replace as necessary.
2. Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
3. Air conditioner low pressure switch defective. Replace switch.
4. Air conditioner fan resistor pack defective. Replace resistor pack.
5. Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary. Air conditioner has a smell when used
   1. The air conditioner evaporator drain hose is blocked or partially restricted, allowing condensation to build up around the evaporator and drainage tray. Clear the drain hose where it exits the passenger compartment.
   2. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

the deflecter is not working you were probably using the defroster when it quit working you will have to take the dash out in order to replace it with a new one.

o air coming from air conditioning vents

1. Check the air conditioner fuse and replace as necessary.
2. Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
3. Air conditioner low pressure switch defective. Replace switch.
4. Air conditioner fan resistor pack defective. Replace resistor pack.
5. Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary.

You have vent door actuator motor that is bad,you may have to pull the dash back into the seats to replace it.

Replace electronic control board

No,its not possible, what about manually control and forget the remote!

1.check blower fan motor.if blower fan motor donot work then compressure trip after 5 to 10 minitue.
2.make switch of airconditioner n reset again.