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Old 09-30-2015, 07:07 PM   #1
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Bad Thermostats

Hi, I'm back again, this time I am having problems with my thermostats. I have the 8530-348 RV Comfort-HP in the living room and it works sometimes with the furnace but at night will stop working and it gets cold but if I put it on heat pump it keeps the RV warm all night. Also it is off in degrees, I have to click it up or down till the ac comes on then when it gets to the temp I want I have to click it till it turns it off and it reads several degrees off from true room temp. The one in the bedroom just operates the AC and the digital reading is messed up so I can't tell what it is set at, but partial numbers show so it looks to be off in temp also. I heard there is are better thermostats I can replace these with instead of buying the same piece of junk. Has anyone the information on what I need to buy? Thanks.
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Old 10-02-2015, 08:26 PM   #2
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Wow-that's a bunch of problems. If my RW, I would get the electrical diagrams, from this site or others and check voltages at the thermostats as the first step. There could be loose connections so also check wire terminals and any wire nuts at the thermostats and AC's on the roof.
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Old 10-02-2015, 09:18 PM   #3
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I'm interested to hear if you can replace with a more modern as well. Mine isn't very accurate either, in fact we use it more manually than anything.

I am years past having any experience on thermostats, but I believe the obstacle was always accommodating the 2 speed fan. It used to be you could add a switch on the new style thermostat, but I don't know anymore.

Attached below is the manual if you want to see it. Wiring looks reasonably standard
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File Type: pdf RV_Comfort_HP_Thermostat_Model_9530-335.pdf (1.15 MB, 33 views)
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Old 10-03-2015, 01:17 AM   #4
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Quote:
Originally Posted by atom ant View Post
I'm interested to hear if you can replace with a more modern as well. Mine isn't very accurate either, in fact we use it more manually than anything.

I am years past having any experience on thermostats, but I believe the obstacle was always accommodating the 2 speed fan. It used to be you could add a switch on the new style thermostat, but I don't know anymore.

Attached below is the manual if you want to see it. Wiring looks reasonably standard
There are other T'Stat solutions out there. My thoughts - our RW's main stat was inaccurate in the beginning. As the sensor is onboard with the stat I noticed that the mounting service was warm to touch. The circuit breaker panel and converter are mounted near the floor however there is a cavity in the wall allowing the heat from the panel to travel up to the stat. Removing the stat from the wall, plugging the hole behind the stat with insulation and placing an insulating material between the stat and and wall should super improve the stat's accuracy for you. Any stat, with an onboard temp sensor most likely wifi not perform much better than the RW stat. From my previous control engineering days I believe that the stat supplied with our RW is a very good product for the application.
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Old 10-03-2015, 04:17 PM   #5
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From my previous control engineering days I believe that the stat supplied with our RW is a very good product for the application.
But its not cute - like Dometic
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Old 10-03-2015, 06:27 PM   #6
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Thermostat - Temp miss read

I had a light switch just below the thermostat that put off a lot of heat. That caused the thermostat to miss read the actual temperature.

There are 2 banks of light switches below thermostat. I flip flopped these switches and the heat problem went away.

My "guess" after competed the flip flop was some wires were not secured properly which created resistance i.e. Heat.

Hope this helps
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Old 10-03-2015, 06:45 PM   #7
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did that go smoothly? No holes or anything to cover?
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Old 10-03-2015, 07:17 PM   #8
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Had to mark every wire and it's location. Used painters tape to write on, then attach to each wire. This took some time.

Unplugged the wires from both banks of light switches (light switches were the same size, so were the hole in the wall). No extra holes to drill or hole in wall to cover up.

I spent about an hour making the change.

Personally like the change, now the bottom bank of switches control downstairs lights, top bank controls upstairs and outside lights.
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Old 10-03-2015, 07:33 PM   #9
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I'll add it to my to-do list! thanks!
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Old 10-03-2015, 08:07 PM   #10
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I have a single bank of three switches directly below the thermostat. I can feel the warmth in the switch plate especially when all three switches are on. I have learned to increase the thermostat setting when heating by about three degrees to hold the desired temp in the room.
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