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Old 05-21-2016, 11:29 PM   #1
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Suburban Heater Not Working

For the life of me, I can not get the suburban furnace to do anything. I have a 2015 Rockwood A192hw. I'm hooked up to shore power, coolcat A/C and heatpump works, propane tanks full (used the hot water heater, and the stove), battery fully charged, furnace fuse in the panel and inline 7.5amp fuses good. Set the digital thermostat to furnace, set temperature to 82 degrees (in driveway prepping, cleaning, and testing everything for next weekend). The fan is set to "AU", and all that happens is a single click at the coolcat unit. Furnace fan doesn't come on, no ignition, nothing. Ambient temperature well below 82 degrees. Any ideas?
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Old 05-22-2016, 09:11 AM   #2
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Do you have a digital t-stat?


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Old 05-22-2016, 11:37 AM   #3
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Yes
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Old 05-22-2016, 11:48 AM   #4
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Suburban Heater Not Working

Ok. I made a mistake once of switching the degree variance from 2 to 1. Follow these instructions to put back to d2

To set the temperature differential the system must be Off. Press the “―” button and, while holding it, also press and hold the On/Off Mode button for three seconds. Release the On/Off Mode button. Then release the “―” button. Press the “+” button to toggle between “d1” and “d2”, “d1” for 1 degree F differential and “d2” for 2 de- grees F differential.

I can't remember if it was my heater or ac that wouldn't turn on after I made this change.


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Old 05-22-2016, 12:20 PM   #5
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Thank you, I will change the differential to d2 if not already there and let you know.
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Old 05-22-2016, 12:26 PM   #6
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I think this is the AC thermostat. The WH usually has a fixed controller as stock.

Quote:
Originally Posted by HONDAMAN174 View Post
Ok. I made a mistake once of switching the degree variance from 2 to 1. Follow these instructions to put back to d2

To set the temperature differential the system must be Off. Press the “―” button and, while holding it, also press and hold the On/Off Mode button for three seconds. Release the On/Off Mode button. Then release the “―” button. Press the “+” button to toggle between “d1” and “d2”, “d1” for 1 degree F differential and “d2” for 2 de- grees F differential.

I can't remember if it was my heater or ac that wouldn't turn on after I made this change.


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2011 Toyota Tundra "Clifford"
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Old 05-22-2016, 02:45 PM   #7
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Quote:
Originally Posted by HONDAMAN174 View Post
Ok. I made a mistake once of switching the degree variance from 2 to 1. Follow these instructions to put back to d2

To set the temperature differential the system must be Off. Press the “―” button and, while holding it, also press and hold the On/Off Mode button for three seconds. Release the On/Off Mode button. Then release the “―” button. Press the “+” button to toggle between “d1” and “d2”, “d1” for 1 degree F differential and “d2” for 2 de- grees F differential.

I can't remember if it was my heater or ac that wouldn't turn on after I made this change.


2014 Evo 2850 "Woodstock"
2011 Toyota Tundra "Clifford"
Ok, I followed your instructions, looks like ot was already set to D2. I toggled them just to make sure. Furnace still not working. Very peculiar. Thank you for the tip.
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Old 05-22-2016, 03:10 PM   #8
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I run ours in "D1" so it does not over shoot so much. it work just fine in this setting.

I would make sure I had 12 volts going to the heater. I would check that I had 12 Volts at one end of the 7.5 fuse. ( I would take it out an measure in the fuse holder.)
The heater check that you have air flow before it does anything more. so no fan it stop right there.
I do not have my manual here but there is a master reset for the thermostat , it uses some combination of the off + or - buttons.
For testing I would set the temp to 90 plus.
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Old 05-22-2016, 04:35 PM   #9
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I run ours in "D1" so it does not over shoot so much. it work just fine in this setting.

I would make sure I had 12 volts going to the heater. I would check that I had 12 Volts at one end of the 7.5 fuse. ( I would take it out an measure in the fuse holder.)
The heater check that you have air flow before it does anything more. so no fan it stop right there.
I do not have my manual here but there is a master reset for the thermostat , it uses some combination of the off + or - buttons.
For testing I would set the temp to 90 plus.
Yes, the next step is tracing. Ugghh. Time to find my old school meter. Thanks for the input. I appreciate all the feedback. This is why I love this forum.
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Old 05-22-2016, 06:02 PM   #10
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Had a problem with my furnace not working and had a RV mobile repair man check it out and he replaced 2 sensors that are located on the back of the furnace and solved my problem When got back in town went to my dealer to submit a warrenty claim and they informed they are having a lot of problems with the sensors on Suburban furnaces. Doing the same fix I had done.
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