Front furnace works great , rear furnace starts with cool air , warms up ( but not to temp of front , then back to cool air then shuts off . This cycle keeps repeating at thermostat calls for heat .
Since airflow is good , does it indicate thermocouple ??
Exhaust from rear furnace does not feel as strong as front unit , not scientific , just a cold hand against it
Lower air flow could be due to a number of causes, but can easily cause your symptom.
First check if for voltage at the furnace (lower outside furnace cover to access).
Does your manual indicate size/output of your furnaces? Usually the rear furnace is smaller. I think it may be because the bedroom area is usually not kept as warm as front of coach, and has fewer windows.
Just stopped for quick break and cranked rear furnace to check symptoms , fan sounded rough and slow on start up .
Moves me toward Brett's idea , voltage or bad fan .
Does the list of repairs ever get shorter ???
Brett
When I check for voltage should furnace be switched on and thermostat calling for heat . ??
Yes, I would check it under load. A bad or corroded connection "upstream" or on the ground side (just as likely) could read good voltage under no load, but drop like a pet rock under load.
In a word no, ya just have to learn to live with some not so important small things until you can get to them.
^.^d Truer words were never spoken.
One also has to learn which small items can turn into major problems that will bite you hard if not addressed quickly.
Checked the furnaces and front is double the output of the rear , consumes twice the current which must relate to motor size and air flow ??
It appears that the rear furnace is 16,000 BTU's and the front is 35'000. See the specs on Barry B's page.
Seems crazy since the rear also heats the wet bay and tanks ?
Would it be possible to fit larger furnace or would electrical / propane feed need to be upgraded
Bigger rear furnace would add to the short cycling it already has.