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I've had two of these units in two years, and suffered through the same issue with both. After just a few months in the first unit, and a few weeks with the second unit both would not fire the furnace. They would indicate that the furnace was running and the manual blower controls would operate the blower, but they would not ignite the furnace. I tested the controls by switching back to an older manual unit and the furnace operated perfectly. Did a quick search and found a number of threads indicating similar problems. Seems that the unit can't supply the correct amperage to open the ignition circuit in a number of different units. Called Honeywell and found that not only to they have a completely useless Indian customer service group, they're hours are exactly the hours that I'm working or commuting and I'm a normal 9 to 5. So buy one if you feel lucky, but keep in mind that most people are going to write a positive review before it craps out on them. It's does a great job with cooling, but if you have a gas central heating and cooling system and you actually want heat in the winter SKIP THIS UNIT!
DON'T BUY ONE!
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The instructions don't tell whether this will work on a 2 wire gas furnace system, but it does. Just hooked the existing red wire to the Rc slot (which comes with a little jumper cable over to the Rh slot which I left in place). Hooked the white wire to the W slot and it works great. Removed an old 2 wire mercury switch. The system is heat only. It uses two AA batteries.
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My RTH2310 started to malfunction after a year. The problem is that the relay that closes the circuit to turn the furnace on started to intermittently fail to energize, even though the flame icon appeared (indicating the thermostat is trying to turn on the heating system). The Honeywell "help line" was useless. They kept telling me to check the furnace and refused to acknowledge that I was able to troubleshoot the problem to the relay. Then, further feedback from them stated that 25-30 VAC is needed on the OUTPUT contacts of the relay to enable it to energize. Incredible!!! I will NEVER purchase another Honeywell product.
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I bought this thermostat without checking the reviews. It worked for one month, then on a cold Saturday morning, it locked up and would not adjust heat. After a half hour of trying to fix this thermostat I promptly smashed it with a hammer. I then called the 800 number on the thermostat to personally thank the company for the hour round trip I made to purchase this item and then another hour round trip I am getting to go on to replace it. I am writing this review in hopes that it will save another poor guy a wasted Saturday afternoon replacing this and missing out on spending the time with his family/friends or just relaxing and enjoying his day off.
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I ordered this to get a programmable thermostat; however, it wasn't until I got the package itself that I found out "not compatible with heat pumps." I could not find this anywhere on Amazon's site, so here is your warning.
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