We just moved into a 50s home with a honeywell chromatherm II (I think) thermostat, which has been working fine. Yesterday I noticed that it seemed cold in the house and the furnace wasn't cycling on and off. The fan remained on. When I looked at the thermostat, which I had set on "Hold 70 degrees", it read 69 degrees instead. I tried to adjust the temperature manually, but it kept coming back to 69. Even after turning the thermostat off, the fan kept going, so we flipped the breaker. My husband tried re-programming the thermostat, but it's stuck at 32 degrees, and the heat still isn't on, but the fan keeps running. Any ideas? Is this a furnace problem or a thermostat problem. My husband is wondering if the problem would be solved if we just bought a new, old-style round thermostat without all the programming.
I never liked the user un-friendliness of the Chromatherm, I would suggest finding a thermostat that you can understand and operate. Yes the Chromatherm is a good one, but so damned hard to figure out. Stay away from thermostats that still use mercury. Good Luck!
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