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Old 10-30-2017, 10:06 AM   #1
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2017 Rockwood Mini Lite heated tanks

I have a 2017 Rockwood Mini Lite 2304 with the heated tanks option. It is my understanding that the heated tanks are 12v heating pads. Over this past weekend, I was out on a trip and it was forecast to be 27 degrees overnight, so I flipped the switch to activate the heated tanks and nothing happened. I have no indicator light, or any other indication that the tanks are heated. I unplugged my shore power cord, and monitored by battery voltage to see if there is any voltage drop indicating an additional load being placed on the battery, and there was none.

Pardon my ignorance, but what am I doing wrong here?

Thanks in advance!
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Old 10-30-2017, 10:08 AM   #2
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I could be wrong, but I believe they are thermostatically controlled. Not with a thermostat you can adjust, but they come on automatically when needed.

You must be a real hot shot (I was told to change to an "o").
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Old 10-30-2017, 10:13 AM   #3
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marinerjoe, thanks for the quick reply!

I believe you are correct, as I read somewhere (perhaps on another forum) that the tank heaters are programmed to come on when the contents reach 40 degrees, and turn off if they reach 67. I would have thought that with an outside temp of 27 degrees, it would have been cold enough for the tanks to come on, but perhaps with the insulated underbelly, and 50 degree temps during the day, they didn't cool off enough?
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Towed: 2017 Rockwood Mini Lite 2304
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Old 10-30-2017, 10:19 AM   #4
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When I flip the switch on my panel the rocker lights up indicating the heaters are on. I don't know if they REALLY are on but that's what the indicator indicates!

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Old 10-30-2017, 10:22 AM   #5
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They sure come in handy, when you remember to use them. I forgot one time and had frozen gate valves when it was time to leave. Using a hairdryer in the freezing wind in not fun.
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Old 10-30-2017, 10:39 AM   #6
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My rocker switch is not illuminating at all, so it sounds like something may be faulty. Since the trailer is only 3 months old, I think I will take it in for warranty service after my last trip of the season this coming weekend.
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Old 10-30-2017, 10:43 AM   #7
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Originally Posted by KansasJohn View Post
marinerjoe, thanks for the quick reply!

I believe you are correct, as I read somewhere (perhaps on another forum) that the tank heaters are programmed to come on when the contents reach 40 degrees, and turn off if they reach 67. I would have thought that with an outside temp of 27 degrees, it would have been cold enough for the tanks to come on, but perhaps with the insulated underbelly, and 50 degree temps during the day, they didn't cool off enough?
This is correct, remember it is sensing the liquid temp not the outside temp, the liquid will retain heat, only real way to tell is with an amp probe 12v. On your circuit.
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Old 10-30-2017, 10:51 AM   #8
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Mine did not work from the factory. It is not likely they test them as they only come on when the water tank gets cold enough. In my case it was a bad ground wire that kept the the heaters from working. You can check the amp draw if you have a DC ammeter or I noticed when mine come on my converter cooling fan runs due to the increased amp draw.
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Old 10-30-2017, 01:19 PM   #9
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When it's gonna get cold enough i flip the switch nuttin happens, but when i awaken the light is glowing blue . Also i replaced all my illuminated rockers with led rockers, my old incandescent bulbs were burnt out .cheap on Amazon measure switches first..
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Old 10-30-2017, 04:50 PM   #10
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Reading the Therma Heat manual that came with my trailer. As noted, the thermostat on the large tank heaters turn on at 45F and off at 67F. Pipe and elbow heaters are NOT thermostatically controlled. Also note that of the 6 pads in the manual, 1 for a 40 gal tank runs on AC, the other 5 specify 13.5 volts DC. The 2 larger DC pads for up to 40 gallon tanks draw either 4.8 and 5.8 amps. The smaller pads for pipes and elbows draw 1.8, 1.7, 0.3, and 0.55 amps.
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Old 10-30-2017, 06:34 PM   #11
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I tried to use mine last night, also. The switch turned blue but I got a small red light in the fuse panel under the fridge. I checked but couldn't really tell anything other than next to the light there was no fuse in the slot. Not sure what to make of that so I turned them off.
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Old 10-30-2017, 10:56 PM   #12
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Originally Posted by KansasJohn View Post
My rocker switch is not illuminating at all, so it sounds like something may be faulty. Since the trailer is only 3 months old, I think I will take it in for warranty service after my last trip of the season this coming weekend.

Mine light up when flipped on, even on a hot day. Yes, I think they should activate by temp, but I'd be looking for a fuse to be blown somewhere. Not sure if men are on the distribution box fuses or in line fused, but sound like a fuse issue.
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Old 10-31-2017, 08:28 AM   #13
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I checked the 30A fuse in the distribution panel that was labeled as being for the tank heaters, and it looked OK, but I replaced it with a known good one anyway. No dice. I will call Forest River and see if there is another fuse hiding somewhere that I don't know about.
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2018 Camping Season: 48 nights, 7216 Miles
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Old 11-01-2017, 11:22 PM   #14
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Mini Lite tank heaters...

All, Be advised the tank heaters work great, but they do draw a lot of current!
Used them in the Spring this past season on our 2506s and they dragged our batteries down to completely dead while Boondocking for one night! The CO2 monitor woke us beeping...and all 12v was flat done....Now we carry a generator!
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Old 11-12-2017, 08:54 AM   #15
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I don't think pipe, valve, or elbow heaters are installed from factory, had to replace a black tank cable no heater. That's why the manual says to make sure there is liquid in the tanks so it heats the water at the valves and downstream elbows. It only needs to get above 32 degrees to keep from freezing.

tstanger the red light on fuse panel indicates a fuse is blown, my guess is that space needs a fuse for the tanks to work, the switch lites may be all grounded together and are not showing an accurate on.
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Old 11-12-2017, 09:17 AM   #16
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I don't think pipe, valve, or elbow heaters are installed from factory, had to replace a black tank cable no heater. That's why the manual says to make sure there is liquid in the tanks so it heats the water at the valves and downstream elbows. It only needs to get above 32 degrees to keep from freezing.

tstanger the red light on fuse panel indicates a fuse is blown, my guess is that space needs a fuse for the tanks to work, the switch lites may be all grounded together and are not showing an accurate on.
I can't speak for Ceder Creek or Rockwood Mini,but Flagstaff and Rockwood made in Bld# 10 located in Millersburg,In installed "Tank/Pipe/Elbow/Valve" 12V Heaters on our unit at the Factory,and the switch for ALL the heaters has a Blue light that comes on when you use the "Tank Heater" switch! Youroo!!
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Old 11-12-2017, 09:42 AM   #17
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Really would have liked if they did that to ours. We are out quite a bit thru November up north in New York Salmon fishing and Erie Pa for steelhead, definitely extra security against freezing.
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