We have just bought a house in Canberra with a Honeywell Thermostat to operate gas central heating system. There is no manual and we do not know how to programme it. I would guess that it is about 10 years old (beige, rectangular shape with digital screen). There is no model no. on it anywhere. Can you refer us to an instruction manual we could use please.

Thermostats don't actually blow anything, the heating system might though. Check the breakers for your heat system, then call a heating specialist. They're really not that expensive.

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 -

R comonY cool W heat G fan C other side of 24 unless you are battery operated. On the back of the Tstat tou should have switch that says gas or electric this controls how the fan operates. If not go into programing and program 1 stage heat one stage cool.Let me know I will walk you thru this.

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

you have a link pin on 3-4 or 1-5 or seperate 2 pin connector,thats were the stat goes,any way round with wires

It sounds like you may have issues with the furnace. A qualified professional can go over the system and the house to let you know if the system and unit are properly sized. The poor performance of a furnace can be a sign of carbon buildup in the furnace.
Good luck, hope this helps.
Matt

when you programed it did you go through all the setup #1-0 ,#3-0 ,#5-5 ,#12-1

Assumed all the wiring are correct,

to change from manual switching from heat to cool, press [system] button ( left ) to go into system setting.

then press and hold the [fan] middle button untill option display 120

use up down button to select option 300 ( Manual/Autochangeover) ,

select 0 for manual, 1 for automatic. ( read caution in page 22 of installation manual )

Good luck

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