Dometic A/C and CCC1 Tstat E1 error

Ok finally got the parts, tool and the weather was good. Redid the connection and all looks good. No errors.
It was easier than I thought it would be.
Thanks Doug for the help

Got the E1 error, to hot to go on roof so I pulled the 12v fuse and turned of the breaker to the AC unit and waited 10 minutes. It's back on now.
Forgot to add that I have the connectors and tool on order.

Thank you for all help

You just need the RJ11 modular ends. Home Depot and Lowes sell them and the install tool also. It is extremely easy to cut the old end off and crimp a new end on. Make sure you get the 4 wire ends. Just follow the 4 wire color alignment from the old plug to insert the cable. I would do this to make sure you don not have a problem with the original ends. I do this as SOP when diagnosing this type problem. Doug

Yes they looked a little dirty so I cleaned them with some spray on electrical contact cleaner.
So far no E1 message.
Thank you for all the help an info.
Do you know where I can get replacement phone type cord and the couplers?

rav wrote:
We have 2 separate tstats. One in living and one in bedroom. Both 2 stats say Zone 1.
I taped the phone quick connects so they would stay in the coupler better.

Did you unplug the phone type plugs and check for corrosion? Doug

We have 2 separate tstats. One in living and one in bedroom. Both 2 stats say Zone 1.
I taped the phone quick connects so they would stay in the coupler better.

You do not have a Penguin model. What did you tape off?????? Did you actually see the Phone type quick connects? If you have 2 AC units, either one can cause your problem with communication. The phone type cable usually goes from the Zone 1 Roof AC to the Wall tstat. Then there is a phone type cable going from the Zone 1 to the Zone 2 control board. On motorhomes Zone 1 is the front AC. On 5th wheel's the Zone 1 will be where the Living room is located. Doug

I found a pic of the tag.
Service parts for HIGH PERF HEAT PUMP, 15K BTU,WHITE, CCC2 T-STAT REQ'D
Model #: 551816A711C0
Product #: 991762941

Got this off domestics site on a parts search

Doug, thank you for the info. I went up and cleaned everything again and this time taped the wires in with electric tape. So far so good. I can't find a model number without going on the roof and taking the cover off, I did the cleaning and taping prior to reading your post. I have serial number the factory wrote down but it is very hard to read...
2016 Bighorn 3760EL. Steve
I will see if I can cross reference the model and serial number with dometic