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I need help to figure out what's wrong with my thermostat/heating system

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I have a White-Rodgers thermostat, Model 1F82-162, that was installed in 2003 or 2004. It runs my outdoor heat pump

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Old 03-01-2012, 09:15 AM
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Default I need help to figure out what's wrong with my thermostat/heating system
Model Number: 1F82-162   Brand: -other-   Age: 5 - 10 years   

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I have a White-Rodgers thermostat, Model 1F82-162, that was installed in 2003 or 2004. It runs my outdoor heat pump and is also attached to an indoor blower (furnace?) unit in a closet. The heat pump is the same age as the thermostat, the indoor unit dates to 1984 when the house was built. Until last night, everything seemed to be working fine with the system.

Last night I noticed the backlight on the thermostat was not on. That was my first clue that something is wrong. Next thing I noticed is that the heat did not come on when programmed to. Neither the heat pump nor the blower was going. So I started checking and testing:
Flame icon was flashing on the screen, indicating it was trying to heat.
Day and time were wrong (said 12 on Mon when it should have been 9 pm on Wed). I reset the day and time. It stayed in memory for some time, but eventually it reverted to 12 on Mon.
I set the switch to Emergency heat and the display responded, but nothing turned on.
I replaced the 2 AA batteries inside the cover. Reset the day and time again, checked that the programming had stayed (it did) and turned it to heat, but nothing turned on.
I went outside and flipped the circuits for the heat pump and furnace off and back on again.
I looked at the outdoor fuse for the heat pump, but don't know enough about it to tell if anything is wrong. It's all behind a plastic cover which I did not remove.
I pressed the Reset button on the inside of the thermostat and waited for any change, but heat never came on, although the thermostat itself seemed to reset (the current temperature showed up as 71 and gradually went down to the actual temp of 57, the day and time had to be reset again).
I checked all the configuration items on the thermostat and they were set at factory defaults.
I set the desired temperature above the current temperature, and waited to hear a click like it says in the manual, but I never heard it click, although the flame icon would display and eventually start to flash.

What part of my heating system might be faulty? I'm thinking I need to replace the thermostat, but don't want to take a stab in the dark. I'm good at following instructions and thinking logically, but am not an electical or HVAC expert.

Thanks for any input!


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  #2 (permalink)  
Old 03-03-2012, 06:06 PM
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Default Update--problem resolved with service pros

So I continued to troubleshoot, checking the outdoor and indoor fuse boxes, and trying to test the wires to the thermostat to see if there was power. Eventually I took out those 2 AA batteries, which the user's manual said were optional, and there was no power to the thermostat at all.

I was out of ideas for what I could do myself, so I called in an electrician. He checked the indoor fuse box to determine that there was definitely power going to the air handler (the blower/furnace that I mentioned in my original post). And there was definitely no power to the thermostat. So I needed an HVAC pro.

I called one in, and he found that a fuse had blown in the air handler. Replaced that, turned on the thermostat, and the fuse immediately blew again. With inspection of the heat pump electrical stuff and some more troubleshooting inside (to bypass the fuse, I think), he diagnosed that the contact unit on the heat pump had failed. He replaced that and the thermostat then started the air handler, and after a 5 minute or so time delay the heat pump kicked in. The heat pump also kicked off and went through some kind of cycle, and within 15 minutes or so was back on, fan spinning, house heating.

Just a note, for anyone who might be looking for service people, or for service pros who want more ways to get customers, I found both the electrician and HVAC service person through ServiceMagic.com. It wasn't even 1 minute after I submitted a request for assistance that I got a phone call each time. Both pros were very quick, friendly, professional, competent and reasonable. I highly recommend that website if you are hesitating about calling someone for help.
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Old 03-23-2013, 02:59 AM
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Default

1st if it uses batteries change the ,next dose the fan on turn the blower on
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Old 03-23-2013, 03:03 AM
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Smile thermostat help

check the batteries if applicable next dose the fan on switch activate the fan
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Old 03-23-2013, 07:08 AM
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Default You're a little late

Uh, John, thanks for the idea about changing the batteries, but if you read the entire thread, you would have been aware that I did that early on in my diagnosis. Besides which, the entire problem has been figured out and fixed 2 years ago when I posted the original problem. All of that info is posted here already, so don't waste your time offering advice for issues that no longer exist. Thanks anyway, and good luck.
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