Dometic Mother Board

dougrainer wrote:

PastorCharlie wrote:

dougrainer wrote:
What does the display state on the wall tstat? Doug

FAN: Auto
SET POINT: 72* F
MODE: Cool or Heat Pump if set to heat pump. Depends upon what mode is set.

OK If both Zone 1 and Zone 2 will show same thing AND you can go from Auto(fan) to the 2 fan speeds. Then the board is OK. Odds are you have NO 120 power to the roof AC unit. This can be a fault at the AC Breaker or also at the upper board 120 connections have had a loose connection and the wire nuts melted and came apart. BTW, you should have a FURNACE option on Zone 1. What Year/Brand/Model RV? IF you have a EMS system, that could also stop 120 power to the roof AC. Which AC is faulted? Zone 2? Doug

2008 Model Year

Zone 1:
FAN: Low, High. Auto
MODE: Off, Fan, Cool, Heat Pump, Furnace, Heat Strip

Zone 2:
FAN: Low, High, Auto
MODE: Off, Fan, Cool, Heat Pump

Has EMS that controls Front Heat Pump, Rear Heat Pumps, Hot Water, and Washer Dryer. Rear Heat Pump is affected, Zone 2.

I suspected the EMS. I asked RV dealer to check EMS and he said it was ok. I went through process of resetting it before having dealer look at it.

PastorCharlie wrote:

dougrainer wrote:
What does the display state on the wall tstat? Doug

FAN: Auto
SET POINT: 72* F
MODE: Cool or Heat Pump if set to heat pump. Depends upon what mode is set.

OK If both Zone 1 and Zone 2 will show same thing AND you can go from Auto(fan) to the 2 fan speeds. Then the board is OK. Odds are you have NO 120 power to the roof AC unit. This can be a fault at the AC Breaker or also at the upper board 120 connections have had a loose connection and the wire nuts melted and came apart. BTW, you should have a FURNACE option on Zone 1. What Year/Brand/Model RV? IF you have a EMS system, that could also stop 120 power to the roof AC. Which AC is faulted? Zone 2? Doug

dougrainer wrote:
What does the display state on the wall tstat? Doug

FAN: Auto
SET POINT: 72* F
MODE: Cool or Heat Pump if set to heat pump. Depends upon what mode is set.

What does the display state on the wall tstat? Doug

The unit will not run. The coach stays plugged into 50 AMP service all time when not in use and both units are set to keep it comfortable inside. During my absence the back unit stopped and does not now work. The front one does ok and cools and heats the whole house.

I will make it a point to check the unit when I have the time.

PastorCharlie wrote:

dougrainer wrote:
If you really need it, you can buy the complete system including the 5 button CCC wall tstat. About $100 more than just the control board. That said, what makes you think your control board is bad? They rarely go bad. What is the failure? Doug

https://www.ebay.com/itm/274201624127?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=274201624127&targetid=1645685073768&device=c&mktype=&googleloc=9027230&poi=&campaignid=16730423415&mkgroupid=135815925780&rlsatarget=pla-1645685073768&abcId=9300841&merchantid=8043804&gclid=Cj0KCQjwvLOTBhCJARIsACVldV2l7iHuPz1l5pssjVX1MhKs_v1yHAJ0NNFy9yw_26T_Dnp9U19s37gaAl8CEALw_wcB

RV dealer tested and said bad mother board. have one on order for over 1 year. Came new from factory with 5 button tstat. Illustrated board not like mine.

If you have a 5 button CCC, both on my links ARE your board. The first link shows the galvinized box the board is in and the 2nd shows the raw board. BOTH are the same. You still have not stated what your failure was. As I stated, the boards rarely fail and is usually a communication cable problem NOT the Board. I have repaired lots of 5 button CCC systems where other service centers and the customer have replaced the board and when the new board did not fix the problem they came to me. Doug

dougrainer wrote:
If you really need it, you can buy the complete system including the 5 button CCC wall tstat. About $100 more than just the control board. That said, what makes you think your control board is bad? They rarely go bad. What is the failure? Doug

https://www.ebay.com/itm/274201624127?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=274201624127&targetid=1645685073768&device=c&mktype=&googleloc=9027230&poi=&campaignid=16730423415&mkgroupid=135815925780&rlsatarget=pla-1645685073768&abcId=9300841&merchantid=8043804&gclid=Cj0KCQjwvLOTBhCJARIsACVldV2l7iHuPz1l5pssjVX1MhKs_v1yHAJ0NNFy9yw_26T_Dnp9U19s37gaAl8CEALw_wcB

RV dealer tested and said bad mother board. have one on order for over 1 year. Came new from factory with 5 button tstat. Illustrated board not like mine.

This will be your board. Doug

https://www.amazon.com/Dometic-3312022-Therm-Electronic-Board/dp/B00NF1MVYY/ref=pd_lpo_1?pd_rd_i=B00NF1MVYY&psc=1

If you really need it, you can buy the complete system including the 5 button CCC wall tstat. About $100 more than just the control board. That said, what makes you think your control board is bad? They rarely go bad. What is the failure? Doug

https://www.ebay.com/itm/274201624127?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=274201624127&targetid=1645685073768&device=c&mktype=&googleloc=9027230&poi=&campaignid=16730423415&mkgroupid=135815925780&rlsatarget=pla-1645685073768&abcId=9300841&merchantid=8043804&gclid=Cj0KCQjwvLOTBhCJARIsACVldV2l7iHuPz1l5pssjVX1MhKs_v1yHAJ0NNFy9yw_26T_Dnp9U19s37gaAl8CEALw_wcB

Wade44 wrote:

dougrainer wrote:
Why are people posting about their refers???????? Doug

Because you have those with some technical or mechanical aptitude, and then you have those who have not a clue, that are best off to leave such things to others, but they still feel the need to post their "valuable" advice or comment which does not have snot to do with the subject?

AGREE . . . Glad they are not working on my rig.