20 Most Recent Honeywell Programmable Thermostat Heater - Page 8 Questions & Answers

on pages 26 and 27 of the manual it clearly states that the unit has a safety device installed in at the doesn't allow the heat and the air to be turned on one right behind the otherif you are testing out both air and heat expect about a 15 minute delay between both of them that is to protect your system just leave the unit alone you don't update by itself and it'll start working correctly in about an hour

Make sure you jumper R to rh. Russ

The first thing to check is your breaker box. There should be one double breaker for the air handler unit, that's the inside unit, and one double breaker for the compressor, that's the outside unit. Check both breakers. If you're not sure if they've be thrown, click them toward the outside of the breaker box (off position) and then click them toward the inside of the breaker box (on position). If the breakers are on and you still are not getting any A/C take a look at your compressor, (outside unit). If the fan is running at least you're getting power. However, your compressor down inside the unit may not be getting power or it may need to be replaced. The compressor has a start-up cap. If this cap goes bad or the wires from this cap fry or corrode away, this will also keep the compressor from starting but the fan will still run. If the fan is not running it could be caused by a faulty relay inside the compressor cabinet. This relay is supposed to open and close based on a low voltage signal from the thermostat. I believe it's roughly 24 volts. This relay switches on and off the 240 volts for the compressor and the compressor fan. Often this relay goes bad or the wires leading up to it fry. If you?re going to work on the unit yourself make sure all power is shut off. There should be a shutoff switch on the outside wall near the compressor. I?d also shut the breakers off.

Instructions on how to turn off your optimum start:-

Turn off ‘Optimum Start’
Step 1 Put the thermostat in the OFF position.

Step 2 Press 3 buttons together (at the same time) which are the INFORMATION BUTTON (i) and PROGRAM BUTTONS 3 & 4.
This will show a code of ICL 1 – now let go of the buttons.

Step 3 Press PROGRAM BUTTON 2.
This will now show a code of 30t 1

Step 4 Press the + BUTTON (on the left of the display), tap through until you reach 15 OP 1

Step 5 With the TEMPERATURE DOWN BUTTON; change the 01 to a FLASHING 0. Confirm the FLASHING 0 with the INFORMATION BUTTON ( i ). The 0 will now be static.

Step 6 Put the Thermostat back in the ‘AUTO’ position.
‘OPTIMUM START’ is now switched off.

Yes, you can replace your thermostat with the Honeywell RTH6350 Model.

Sound like you need new one... take a look on amazon ecobee3 Smarter Wi Fi Thermostat Remote Sensor. It's not worth repairing it..

Hi, take a look on amazon for replacement, here: Defy Mother Nature with our Best Buy. I hope this was helpful. Cheers

It's not your thermostat. Go to where your heating system is and give us a make and model number so we may help you.

Hi, your replacement part can be purchased on amazon, take a look here: Amazon com honeywell chronotherm III thermostat. I hope this was helpful. Cheers

Sounds to me like a breaker has popped. In the main power panel, see if one of the breakers is in the center position.

It is definitely a furnace problem. Once you turn the thermostat up above room temp, it closes a switch and sends power to your burner, (gas or oil). It would seem more like a problem at the burner that is causing you problems. If you do not have experience with heating equipment I suggest you call a local repair man. Hope this helps a little

I have the same issue TH5220D1029 0606

No friend, Inside the Honeywell box WILL be a battery. which is there to keep your settings if a Power Failure occurs. All you have to do is change it and reset your Control. A typical change of battery is explained here. http://homeguides.sfgate.com/change-wall-thermostat-battery-25307.html

Check for cold air inside the wall behind the thermostat, a cold wall, and area that is getting hot or cold air blowing on the thermostat. Last, the heater may not be compatible with some digital thermostats. Honeywell Customer Care toll-free at 1-800-468-1502.

un snap the t-stat off the wall yo find the batteries