Still kinda new at this rv thing and only owned lessthen a year, so thanks for the help.1999 holiday rambler 40' 2 units on the top.Last time I used the roof top units was mid summer and ac worked great. Now cold out was trying to use heat and it doesn't work. It has 1 thermostate for both units. It's a 4 button thermo and you hold the top 2 buttons in to switch from zone 1 to zone 2.Go to fire up the heat this weekend, turn the on/off switch on the bottom and the display lights up like normal. But when selecting the mode... only goes to fan, cool, mode off. Nether unit kicks on, it doesn't say which zone its controlling like normal and nothing happens.checked the breakers in a small box between the bathroom, and bedroom. Nothing else i could find that may go to the units.thanks guys .........

Are your rooftop units heat pumps? If not then they won't do a thing for you in the winter. Your furnace should be in the basement and runs on LP. Is your LP on?

ummmmm I think they are. The LP I do have off and there is another thermo below the digital on with a slide leaver on it side. Is that one for the LP system. There is also an AUX heat switch on the dash next to the radio that lights up when turning on but does't seem to do anything.I thought the digital thermo used to say heat, and heat pump when cycling through the modes.

On my 1999 HR, the one Duo-Therm thermostat controls everything (two rooftop A/C units and furnace), but it has to be on Zone 1 for the furnace to run. And yes, you have to have the propane turned on for it to work as well...otherwise, the unit can't light.

But thermo would never go to heat .... and which zone it was on never lit up.

Slojoe72 wrote:But thermo would never go to heat .... and which zone it was on never lit up.Your furnace is controlled by zone 1, Press the mode only on zone 1, see furnace, Raise temp to 81-82 with propane turned on and good 12 volt source.

No heat/not turning on | Good Sam Community

Effy
Explorer II
Nov 02, 2015
Are your rooftop units heat pumps? If not then they won't do a thing for you in the winter. Your furnace should be in the basement and runs on LP. Is your LP on?
Slojoe72
Explorer
Nov 02, 2015
ummmmm I think they are. The LP I do have off and there is another thermo below the digital on with a slide leaver on it side. Is that one for the LP system. There is also an AUX heat switch on the dash next to the radio that lights up when turning on but does't seem to do anything.

I thought the digital thermo used to say heat, and heat pump when cycling through the modes.
10forty2
Explorer
Nov 02, 2015
On my 1999 HR, the one Duo-Therm thermostat controls everything (two rooftop A/C units and furnace), but it has to be on Zone 1 for the furnace to run. And yes, you have to have the propane turned on for it to work as well...otherwise, the unit can't light.
Slojoe72
Explorer
Nov 02, 2015
But thermo would never go to heat .... and which zone it was on never lit up.
vegasfoodguy
Explorer II
Nov 02, 2015
Slojoe72 wrote:
But thermo would never go to heat .... and which zone it was on never lit up.

Your furnace is controlled by zone 1, Press the mode only on zone 1, see furnace, Raise temp to 81-82 with propane turned on and good 12 volt source.
Slojoe72
Explorer
Nov 02, 2015
Thermo won't go to heat, and at the bottom of the screen where it says which zone its on...... That doesn't light up.
vegasfoodguy
Explorer II
Nov 02, 2015
Slojoe72 wrote:
Thermo won't go to heat, and at the bottom of the screen where it says which zone its on...... That doesn't light up.

Is the switch turned on, On the bottom? The unit that looks like thermostat is control for Fantastic fan.
Slojoe72
Explorer
Nov 02, 2015
Yes switch is on .... Digital thermo. I've used before for ac and controls both zones, and I thought when you cycle through the modes there was an option for heat, and also heat pump.
What's fantastic fan?
MountainAir05
Explorer II
Nov 02, 2015
If you do not have the manual here is a link for your manual.

http://bryantrv.com/docs2/docs/ccc.pdf
jtfcons
Explorer
Nov 02, 2015
Slojoe72 wrote:
Yes switch is on .... Digital thermo. I've used before for ac and controls both zones, and I thought when you cycle through the modes there was an option for heat, and also heat pump.
What's fantastic fan?

The fantastic fan is the roof exhaust fan that is in the kitchen area (at least it is in our HR). With the vent hatch opened the fantastic fan thermostat controls when the fan runs.

As far as the rest is concerned, it sounds like the thermostat control for the heat/heat pump is not working because the proper modes are not appearing when choosing on the thermostat. I replaced my thermostat a few years ago, not that expensive. Next step could be that the main control board is bad. This is located usually in the zone 1 unit. JMHO