Dennis, welcome!
I have a 2005 38 FDTS LTD so your systems should be close if not the same as mine, depends upon options and if you have an APEX. First a couple of questions. 1) do you have the heat pump option? 2) have there been any modifications to the heating system? 3) what type of thermostat do you have?
I have a replacement t stat (the old one died) that has a separate setting for the HP, so I have a setting for HP and one for hydro hot.
The Hydro Hot heats on 3 sources the switch should be in you utility closet near the t stat.
1) diesel - turn on the "diesel" switch, set the t stat.
2) electric - turn on the "electric" switch, set the t stat, there is not much volume of hot water in this mode but if you are careful you can do dishes and take a quick shower. If I am on shore power I leave this switch on all the time.
3) engine - no switches on, while you are driving the engine heats the hydro hot and you get "free" heat, just set the t stat.
You can also use the Hydro Hot to pre heat the engine, just turn on the preheat switch.
You will have 2 zones, the front of the coach and the rear. You should also have a hidden zone, the basement, there is an adjustment for the temperature on the ceiling of the basement, mine is near the Glendinning power reel, I have never changed it, the basement stays warm where it was set by WRV.
Let me know if you have any other questions.
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Dave, Bobbi and Fenway
2005 38' FDTS Alpine Limited, 2016 Jeep Grand Cherokee Limited
Lake Wales, FL
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