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Re: honeywell chronotherm IV plus controller
Sorry to hear that, not to be the perveyor of the obvious but for everyone else.. ALLWAYS check and make sure your pins are straight when you do a battery change. OMG they charged you 300 for a thermostat? im very sorry
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probably tripped a limit switch or a low voltage fuse would kill your display on the tstat, you should have battery power on your stat though.unless you have knowlege of electrical you better call a technician
Most Honeywell Thermostats have battery back up to maintian program during power outages, so replace the batteries.
Some thermostats have a button type battery hidden just behind the front cover, you have to take the whole thing apart to get to it, these usually last a long time, unless the thermostat was installed and then removed and sat without power hooked to it,
The final type uses a capacitor to store power, it will usually hold program, for 7 days with no power, if the capacitor is bad, it is time to replace the whole thing.
Hope this helps, good luck.
Thanks for the info but how to get the front cover off. Two screws underneath allow the whole unit to be removed but then - nothing. There are two plastic tabs but they do not release anything as they are at one end. The other end remains firmly fixed.
One of two things either the disply has gone out which is likely as it is a common failure for that thermostat or your heating unit is not sending control power. the older chronotherms were system (24volt ac) powered the new hardware/box store units are battery powered. Either way display should not be blank with fresh batteries. to get heat on remove the thermostat jumper or twist together the wire from the R terminal with the wire from the W terminal. note the color of each wire for later reference, heat up house disconnect wires from each other and go purchase a new thermostat
I pressed the reset button in error and the display just would not return o no heating or hot water. Nothing tripped on the board and all wires and the unit itself showed power coming through.I got it working again by sheer determination.
What I did
I took the unit from the base plate and opened the front panel to see circuit board. It has 4 clips and it all goes back together easily.
What I did.Time taken 15 minutes.
The tiny rubber reset button was collapsed, perhaps maintaining the 'off' situation.
I moved a tiny wire from touching the side of the battery.Perhaps not important but it didnt look right.
When i remounted the unit it lit up beautifully.
So the solution lies in 1 or all of these 3.
If it happens again I will try
1. simply remove the unit from its base plate and remount to see if that is all it takes.
2. Open the front and check the reset button isnt collapsed and stuck.
3. Just move that little wire from leaning against the battery -(least sure of why this might help)
which model do you have ? the 8000/8001 or 8011 the set is different depending on your type of heating system. This model has a memory chip not a battery that saves your settings. So you could be looking at replacing the unit.