00 reading on Coleman-Mac thermostat

[lwasouth]

We have an 2011 Itasca Meridian 40U and were having the problem of the double zero lockout on the thermostat. Only occasionally on shore power, but every time when dry camping on generator power. Previous remedy was to remove the face and take the fuse out for 5 minutes and replace. Unit would go to 00 several times again.
New solution (and it has worked with no problems for 2 weeks of dry camping) before turning on the electric heat, turn on the electric hot water and system should work flawlessly

[CLIFFTALL]

Another choice is a choke filter. Here's a thread that discusses it.

http://www.irv2.com/forums/f54/fluor...ce-196291.html

[DancinCampers]

When I first started replacing my ceiling lights with LEDs I ran into the same issue with the tstat locking up. Here is what I received from RVP:

Reset Procedure for Zone Control Signal Disruption


The problem you are experiencing is usually caused by one or more of the twelve volt components in
your coach. The most common would be a bad ballast on a fluorescent light. If this is the case, you
will need to leave the light off until the fixture can be replaced. Follow the directions below to locate the issue.

1.
Make sure that all upper units, ceiling assemblies and control boxes are installed correctly and 12 volt power is on.
2.
Place the thermostat slide switch in the “OFF” position.
3.
Remove the thermostat cover.
4.
Remove the fuse for five minutes.
5.
While the fuse is out, turn off all the twelve volt lights, unplug anything plugged into a twelve volt outlet, make sure you turn off anything else you can that is twelve volts without shutting down all the twelve volts for the coach.
6.
Reinstall the fuse and wait another five minutes. NOTE: Do not touch any buttons or switches during this time, doing so will cause the thermostat to lock out immediately and you will have to start over.
7.
Once the thermostat is back to running normal, go back through everything you can in the twelve volt circuit in the coach, turning them on to see if they affect the thermostat. When you find what is causing the problem, the thermostat will do something out of the norm. Usually the thermostat will show “00”, a phantom zone, dim way down, or even go blank. If the thermostat does any of these “out of the norm” displays, then you know that the component you just turned on is causing the problem.

Known Causes:
(it will always be in the twelve volt circuit, so look for these components to be plugged into 12vdc)


Cell Phone Chargers
Electric Shavers
Brake Buddy System
Fantastic Fan
AC Ripple (usually a filtering issue at the converter)
Computers

Replacing the LEDs with different manufacturer fixed my issue with the tstat.

[lwasouth]

Have the choke filter, does not help. Have checked out all items we could find that might cause interference on 12V line. So far the only thing that works is to have the electric hot water on, pulling power prior to starting heat pump.

[scampers227]

My Wilson cell booster locks mine almost every time it's on. Replaced tstat and added choke but neither helped. Learned to live with it.

[gatorcq]

I think it is time to understand just what is the T-stat controlling.
Our's controls the Heat-pump, and the propane furnace and normally it is because the T-stat calls for heat. If it does not see an increase in temperature, it will repeat this process a total of 3 times. On the 3rd time it will lock me out for 2 hours.
So, maybe a little more clarification is needed.
What system do you have:
It is on the propane furnace
Heat pump
AC unit.

Oh, another option is to get a hold of the manuals, operator and service.

[DancinCampers]

Your water heater has a 12v relay for the 120vac side. Maybe this is dampening any noise on the 12v side when you have the heater on.

Bottom line is, if it works for you, stick with it.

[lwasouth]

Thought we had it down to our electric toothbrush chargers, nope this morning even with them off 00 again. Tomorrow back to the electric hot water heating turn on before heat pump.