Programmable Thermostat Heater: no power to honeywell central heating control...

Probably not. There are replacement models available.
The T6661B programmable room thermostat is also known as CM61.
CM61 1 day wireless programmable thermostat is replaced by CM921.
CM61 1 day wired programmable thermostat is replaced by CM901.

Go to Honeywell.com and look for thermostat manuals, you can download it some there.

I have only seen one Honeywell thermostat that would work with a 3-wire heating system.

I would replace it with a White-Rodgers 1F80-0471. They are about $100, but they are a good thermostat, and they work well with the 3-wire zone valves.

Most other thermostats have the "Y" terminal that you need, but do not control the zone valve correctly.

Helping Hands Services
- Fairbanks, Alaska -

This does not sound like a thermostat problem. I would be looking for a zone valve or circulator pump problem.

go to
http://www51.honeywell.com/honeywell/
and enter your model number on the right side near the top.
Hank

Sounds like it may have lost power. Check the breaker and the fuse at the furnace. If they are all in the on position and working then it sounds like you may need a technician. If the display is blank on the thermostat you may also want to replace the batteries.

Looks like it was replaced by the CM67 series, try this link for the manual:

http://www51.honeywell.com/pacific/common/documents/CM67_User.pdf

Geno

is the buttons still working, eg, boost, on/off etc? or is the heating not working?

If so the LCD/Control panel may have lost power, this usually a switch/or fuse that may have been accidently powered of or blown

the analog unit uses just two wires for heat. red - white. there is a heat anticipator setting that must match the burner current. check your programmable specs and follow instructions.

go to www.honeywell.com. There you will find a search tab. Type in the exact model number of your thermostat. You will be able to download the installation/owners manual.