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Old 01-14-2019, 10:31 AM   #1
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Temperature Sensor

On a recent trip out west we hit some pretty cold weather in Tucson, so we were running both furnaces and both heat pumps. Wife noticed that the front was getting pretty warm, so I checked the read-out on the control station. The front temp sensor said 48! I shut down the heat pump and the sensor jumped up to 75. Turned on the heat pump and it went back down to 48!

Over the next couple of days, I monitored what was running against the sensor. The sensor would occasionally drop to 40's or 50's, but at other times showed 70 or so (as appropriate). I noticed the sensor is next to a air return duct up front. Usually the temp reading worked right when running only the gas furnace, but even then it flaked once or twice. The back systems and sensor were rock steady.

What do you think? Just a bad sensor? Kind of important, as there is no way to manually override the furnace or air conditioning settings.
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Old 01-14-2019, 11:58 AM   #2
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You should put the year of your coach in your signature. If itís still under warranty, call Tiffin and have them send you a new sensor. Pretty easy to change.
I donít like that the sensors are right next to the air returns either. I finally blocked the return in the front of our bus due to wrong temps.
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Old 01-14-2019, 12:32 PM   #3
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Quote:
Originally Posted by TexasSprinter View Post
What do you think? Just a bad sensor? Kind of important, as there is no way to manually override the furnace or air conditioning settings.
Pull the vent cover off of the return air vent closest to the sensor. Reach inside the duct and you'll find the wiring for the sensor. Pull it out to where you can reach the crimped connections. Try re-crimping or soldering them and that may correct the problem. It did on mine that was giving erratic readings. All else fails, order a new sensor.
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Old 01-14-2019, 12:34 PM   #4
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Remove the sensor and check the wiring is connected properly. You may be able to get to the wiring through the return air grill. Tiffin does locate the remote sensors next to the return air inlet.
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Old 01-14-2019, 12:47 PM   #5
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Thanks

Thanks, guys! I didn't think about pulling the return cover to see the wires. That sounds exactly right. My first thought was a bad connection.
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