Intellitec ECC problem

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Budg59

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Mar 31, 2019
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3
Hi all,
I'm new here and have an 02 Bounder 33r. Standing there yesterday and the heater and both AC units decided to come on. I can't turn them off without unplugging them from the ecc or unplugging the thermostat ecc. I am plugged into shore power and tried unplugging but the furnace still runs. The green light on the thermostat is very dim. Any thoughts or suggestions would be greatly appreciated before I start spending money on new parts.
 

Alfa38User

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Oct 4, 2007
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6,678
For starters, the furnace is 12V and propane so shore power on or off does nothing. It is controlled by the thermostat directly, so disconnecting/unplugging the thermostat itself (after removing from the wall) should shut it down.
I'll leave the ECC stuff to the experts here.
 

Gizmo100

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Sep 28, 2018
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3,029
Welcome to the RV Forum Budg59

The dim light would suggest to me that the 12 volt battery may be low.

That would suggest that the converter may not be working.

I would disconnect ALL power. Unplug the shore line and disconnect the battery.

With all power remove I would check the shore line connections to the RV. You looking for loose wires.

After checking, hook everything back up and see if the system reset itself
 

Budg59

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Mar 31, 2019
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Hey thanks Gizmo, I'll definitely check and see if that works. That would be a very inexpensive repair considering the cost of new ECC modules and thermostats
 

Utclmjmpr

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Sep 14, 2009
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5,617
Location
Cedar City, UT
Throwing new parts at a problem does not guarantee a fix,,is very expensive,, and frustrating when it doesn't work.>>>Dan
 

Budg59

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Mar 31, 2019
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Well I tried your suggestion Gizmo, not the problem, batteries have 13.2 volts . Not sure how many volts the thermostat is supposed to have but it has 9.7. Did some checking on the thermostat circuit boards and the switch will never read open, always has a complete circuit even when switched to the off position. Put a toggle switch in place of the thermostat to run the furnace and it works as long as I turn it on and off. Going to see about finding someone else to check the thermostat and repair it if needed. Thanks again for your help
 

Gizmo100

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Sep 28, 2018
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Budg59 said:
Well I tried your suggestion Gizmo, not the problem, batteries have 13.2 volts . Not sure how many volts the thermostat is supposed to have but it has 9.7. Did some checking on the thermostat circuit boards and the switch will never read open, always has a complete circuit even when switched to the off position. Put a toggle switch in place of the thermostat to run the furnace and it works as long as I turn it on and off. Going to see about finding someone else to check the thermostat and repair it if needed. Thanks again for your help

I'm going to bow out and let the smarter people step in and help.

But a couple things that caught my eye. If you plugged into shore power the batteries should read 13.6 volts. and I believe the volts on the thermostat should be 12 volts. But I could be wrong on both accounts.
 

giteup

Member
Joined
Sep 17, 2011
Posts
14
On the 33R the brain box for that is in the bedroom behind the breaker and fuse
panel which is on a hinged board. look behind there.
https://www.discoveryowners.com/ECC.pdf
 

Laura & Charles

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Jun 10, 2016
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819
Location
Could be anywhere. Originally from Ohio. Go Bucks!
Is it possible you have AC units that can also run as heat pumps?  That?s what we have and when actual temp gets enough (4 or 5 degrees) below the thermostat set temp, the propane furnaces will kick on, too.  If I didn?t know about the heat pump capability, I would describe exactly as you and question why furnace and AC coming on at same time.
 
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