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10-19-2020, 09:56 PM
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#1
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Member
Tiffin Owners Club Ford Super Duty Owner
Join Date: Dec 2016
Location: Ottumwa, Iowa
Posts: 39
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Thermostat Temp not Reading Correctly
I have a 2017 34PA with two thermostats. One for the rear air-conditioner and the other for the front air-conditioner and electric heat pump. The front thermostat does not read the correct temp. I am hoping someone knows how to fix this? Also, these thermostats that came with my RV seem pretty antiquated. Is there a newer style of thermostats available to replace them with?
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2017 Tiffin, Aleggro, Open Road, 34PA
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10-20-2020, 09:03 AM
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#2
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Apr 2012
Location: Southern NM
Posts: 3,386
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Check the connection at the thermistor in the ceiling . They have been known to have bad connections. It’s a small white button mounted near an air inlet for the AC?
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2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2022 Jeep JLURD
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10-21-2020, 04:37 AM
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#3
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Senior Member
Join Date: Jan 2019
Location: Macomb MI
Posts: 212
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How much is it off? Swap the two temp sensors. That would help isolate problem.
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10-21-2020, 09:21 AM
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#4
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Senior Member
Join Date: Aug 2004
Location: Wherever we are
Posts: 4,288
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Occasionally, one of the three stats in my coach will show a way low room temp. Have checked all the sensors and they are tight/wired good. I just run the set temp down (AC) or up (heat) enough to get the unit to come on. Sooner or later, they correct themselves.
What the real fix is I don't know...
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'16 40QBH Phaeton
'21 Sahara HA toad
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten
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10-26-2020, 04:06 PM
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#5
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Senior Member
Tiffin Owners Club
Join Date: Feb 2014
Location: Elverta, CA
Posts: 196
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Thermostat has wrong temperature
I'm having a similar problem, where my front and mid AC/Heat pump thermostats read way too different sometimes. The thermostats are side by side in a front cabinet, so it's easy to see the difference. The ceiling sensors are in the same room... LOL. One towards the front and one towards the back. I'd expect the two readings to be close. I had service provide a replacement thermostat under warranty, but it really didn't make much difference.
I haven't fixed it yet, but I'm guessing that the wire from the front sensor to the thermostat was punctured by a nail or staple during assembly and now the wire goes open or shorted occasionally. I'd like to replace the wire, but it's too tight to pull. Maybe it's fixed with a wire tie or something. Please keep us posted on how you resolve this. I will too.
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Brad & Dianna
2017 Allegro Bus 37AP
2015 Jeep Cherokee
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10-26-2020, 04:11 PM
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#6
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,570
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Brad, it's a common problem usually caused by loose contact or corrosion. Go go to the air return vent closest to the sensor with the faulty reading. Feel inside the duct and you'll find the sensor wires. If you can pull them out far enough through the duct to reach the connectors, use a pair of pliers and recrimp the connections. If you can't pull it out far enough, remove the sensor from the ceiling and pull the wires out far enough to reach the connectors and recrimp. The very best solution is to solder the wires to avoid any corrosion.
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2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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10-26-2020, 06:20 PM
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#7
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Senior Member
Join Date: Mar 2017
Location: MD
Posts: 260
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Lt Dan is right on. Many do not realize that the temperature reading is not done at the Thermostat rather it is at the ceiling mounted thermistor. Re-crimping the connections will usually solve many problems.
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Fulton and Donna USN Ret (both)
Maryland
2016 Tiffin 32 SA, 2013 Smart Toad
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10-27-2020, 03:20 AM
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#8
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Member
Tiffin Owners Club Ford Super Duty Owner
Join Date: Dec 2016
Location: Ottumwa, Iowa
Posts: 39
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Thanks for all your replies. I havent had a chance to look at the wires or the connections yet, but I will at first chance. We are having a cold snap here in Iowa and I have the RV in the storage shed for now. Hope to have it out for a southern trip after the 1st of the year. Again thanks for your help!!!
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2017 Tiffin, Aleggro, Open Road, 34PA
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10-27-2020, 07:35 PM
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#9
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Senior Member
Tiffin Owners Club
Join Date: Feb 2014
Location: Elverta, CA
Posts: 196
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How do you know so much?
Quote:
Originally Posted by Lt Dan
Brad, it's a common problem usually caused by loose contact or corrosion. Go go to the air return vent closest to the sensor with the faulty reading. Feel inside the duct and you'll find the sensor wires. If you can pull them out far enough through the duct to reach the connectors, use a pair of pliers and recrimp the connections. If you can't pull it out far enough, remove the sensor from the ceiling and pull the wires out far enough to reach the connectors and recrimp. The very best solution is to solder the wires to avoid any corrosion.
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Dan, I checked inside the air return next to the sensor and sure enough, I found the wires, the 2 crimped butt connectors, and the top of the sensor. It's stuck in the hole with putty. I plan to replace the butt connections with soldered connections. Things were working fine when I checked this. The real test will be when I'm on the road and needing the A/C to do the right thing.
The whole saying is "How do you know so much, about so much?" Thanks for your efforts helping us get things fixed.
__________________
Brad & Dianna
2017 Allegro Bus 37AP
2015 Jeep Cherokee
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