I just talked to Honeywell support - they claim that an eee error means there has been a "unique error" and that the unit will need to be replaced - cannot be fixed. They were pretty good about giving a suggestion for a new thermostat and wiring directions if you want to DIY. Otherwise, call a pro.
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There should be a teeny tiny hole in the face of the thermostat for a paper clip to be inserted for clearing all programmed data and taking it back to the factory parameter settings. If not on the face, it should be on the circuit board and may even be a micro-switch.
Could be the battery in the thermostat needs to be replaced. Or the transformer on the wiring from the unit to the thermostat has failed. The transformer is either an 18 volt or 24 volt model. It should be printed on the side of the transformer.
Per manual do this:
System set to Off
Replace IN REVERSE POLARITY POSITION or 5-10 seconds
Put back in with CORRECT POLARITY
Reprogram per sticker on back of thermostat.
Just did this myself and it's simple and effective!
There is no battery, but I have one as well and it also goes blank. When that happens, you pull the front bezel off of the back mounted plate carefully and put it back on by attaching the 2 tabs at the top, then swing the bottom back towards the plate until the 8 pins go into the connector on the removable bezel. When you first pull it off, do it slowly and pull from the lower sides straight out.
I think what is happening is the pins get corroded and lose contact with the removable front.
Hope this helps you out.
Take a multimeter and check your rh and w terminals. With the face off, you should get 24 volts. If you do not get 24 volts, turn the power off, and check the continuity, you should get ol (open load). Now if you do not have 24 volts, and the meter reads ol, there is a problem in the wiring to the thermostat. My only concern is the green light blinking slowly, but if that is normal on your unit, I will let it be. Hope this helps