National owners with two Atwood Furnaces

[Retiredblade]

Got home from Florida, both furnaces worked fine, been running one at home to use up the propane so I can get the shutoff valve fixed on the propane tank. Was using zone 2 furnace but it has stopped. On the Duo Therm Comfort zone thermostat, the furnace is not recognized, in zone one it is. Did some testing and I only have 1.40 volts going to zone 2 furnace, got 14 volts to zone one, it works fine. Can't fine any fuses blown, if there were, wouldn't be getting 1.40 volts.
Anyone have any ideas?

[Theberrys]

If you have a four button Comfort Control Center (Thermostat).Here are the reset procedures from the service manual you can upload here ccc 4 button service manual.pdf - Windows Live.

RESET
If the Comfort Control Center is not operational, inadequate
data or no functions occur, reset the Comfort
Control Center to factory setting. When a reset procedure
is done, all previous program memory is removed.

The factory setting of 72

°F for cooling mode

and 68

°F for heating modes are entered.

To initiate a RESET, do the following in the order

listed

:

1) Turn control on to ensure annunciator data and light

are present. If data and light are present, continue to
next step. If data and light are not present, see Sec.
5.1.
2) Depress

MODE switch to activate annunciator light.

3) Simultaneously depress the bottom two buttons

(temperature UP and DOWN) and hold.
4) While holding these buttons down, depress the
MODE button once and release.
5) Release the two buttons previously held down.
6) Depress the MODE button once again.
7) At this time the light should extinguish, and the mode
should register "OFF". If not, repeat Steps 2 through
6.
8) Retest system ensuring that all functions are present

and operational

Sometimes the setup gets corrupted and it needs a reset.

Dick

[Retiredblade]

Thanks for the info. Here is what is did this afternoon. I took the hot wire off the on-off switch in the furnace, got my jumper pack, put 12v to the terminal on the switch and ground to furnace chassis. Went inside, the thermostat was reading the furnace and worked. Went out put things back, went to the distribution center in the battery compartment, nothing much labeled, even the picture of the center in my owners manual doesn't match the one I have, anyway, found the wire from the first furnace, then the wire from the one I am having problems with. Took wire off the terminal, put meter on, still measured 1.40v, so the problems seems to be there, then I found a vacant terminal with the proper voltage, put the furnace wire on it, the thermostat recognized the furnace and it runs. Got to have to check out behind that dis. center and see if there is a problem there, go figure!

[Theberrys]

Here is a picture of the fuses for my furnaces.

Dick

[Retiredblade]

Thanks much for the pictures, I will check this out tomorrow!

[Retiredblade]

My rear furnace was connected on the terminal P1 originally. Someone has been messing before I got the coach. The color of wires coming from my front furnace is white, black, purple, and red. Coming from the rear is white, black, green, and red. I don't see why they fused the furnaces, they have a curcuit braker right after the on-off switch inside the furnace.

[Luv2go]

Quote:

Originally Posted by Retiredblade I don't see why they fused the furnaces, they have a curcuit braker right after the on-off switch inside the furnace.

There's probably a rule about fusing a wire within so many inches of the voltage source, more to protect the wire from overheating than anything else.