Skip to main content ↑ ↓
Topic: coach heat (Read 516 times) previous topic - next topic
0 Members and 1 Guest are viewing this topic.

coach heat

Yahoo Message Number: 25767
It is becoming a nightmare. 04 Intrigue with two AC/heat pumps, hydro-hot for hot water and furnace heating controlled by the usual Dometic Duo-Therm Comfort Control; for ease of typing let's call it the thermostat. As outside temps go down (say around the high fifties) the thermostat light does not come on for several minutes when placed in the on position. When it does come on a push of any button will turn it off for awhile. Then it comes on and utilities and temps can be selected. Then the furnace or the heat pumps, which ever is selected will enter about 1-2 minute cycles. Also the thermostat comes and goes. Sometimes the heat pumps or furnace will cycle off before the thermostat turns off several seconds later.
Sometimes not both heat pumps nor both front and back heat registers cycle off simultaneously but sometimes they do. Now, in warm weather the two ACs work great and if I set the thermostat very high, say in the 90s, then the heat pumps and or the furnace seem to work as advertised. The thermostat has been replaced twice with no result and thus we concentrated on the front AC printed circuit board. It was replaced with one sent from Dometic and when it was installed nothing worked--bad board! A second board was installed and the above operational scenerio returned just as it did with the original board.
So, it appears that we have an outside temperature sensitive component somewhere or something else that I have not thought of.
With winter approacing I sure would like to track down this beast.
All suggestions welcome except a new coach!

Lyle Wetherholt
04 Intrigue 11740
 

Re: coach heat

Reply #1 –
Yahoo Message Number: 25795
Lyle,

While we did not have the same symptoms, they are close. On our 2004 Intrigue, the thermostat would not turn on (display blank) in very hot weather in Arizona usually in the late afternoon while the coach was sitting in storage. The A/C would not turn on at all.
Then after waiting till the next morning the display would return and A/C would work. As long as the coach interior was not extremely hot, it would continue to work.

The cause was voltage drops to the thermostat on the 12v side. I believe they added a capacitor to eliminate the short duration voltage "sag"

No problems since.
Ron

2004 Intrigue 42
11849

Quote from: Lyle Wetherholt
>

It is becoming a nightmare. 04 Intrigue with two AC/heat pumps, > hydro-hot for hot water and furnace heating controlled by the usual > Dometic Duo-Therm Comfort Control; for ease of typing let's call it > the thermostat. As outside temps go down (say around the high > fifties) the thermostat light does not come on for several minutes > when placed in the on position. When it does come on a push of any > button will turn it off for awhile. Then it comes on and utilities > and temps can be selected. Then the furnace or the heat pumps,

which

Quote
ever is selected will enter about 1-2 minute cycles. Also the > thermostat comes and goes. Sometimes the heat pumps or furnace

will

Quote
cycle off before the thermostat turns off several seconds later.
Sometimes not both heat pumps nor both front and back heat

registers

Quote
cycle off simultaneously but sometimes they do. Now, in warm

weather

Quote
the two ACs work great and if I set the thermostat very high, say

in

Quote
the 90s, then the heat pumps and or the furnace seem to work as > advertised. The thermostat has been replaced twice with no result

and

Quote
thus we concentrated on the front AC printed circuit board. It was > replaced with one sent from Dometic and when it was installed

nothing

Quote
worked--bad board! A second board was installed and the above > operational scenerio returned just as it did with the original

board.