Truma Errors

[Keep Right On]

I know there are a number of threads but tonight I get an E638H when heating on EHU. Can't find this anywhere on the Truma site or lists of error codes anywhere. This is in addition to the E515H when trying gas (seems thats a new combusion unit).
Its a 3 month old Bailey Adamo 75 4DL and so will be warranty work.
Oh, and the hab door won't lock tonight - remote or manual
p***ed off

 

[Littlewheels]

Have you tried a complete reset?

 

[Keep Right On]

I have.
Thanks

 

[Wanders from Glos]

Have you tried a complete reset?

That was a really useful video to save, thanks

 

[Keep Right On]

Update: Rang nearest Bailey dealer (Dolphin, Southampton) not taking new customers on.

Rang Truma customer service - very helpful diagnosed fsult over phone - new combustion motor needed. 638 fault is electric equivalent of 515 gas. Suggested desler search and found mobile engineer in Southampton. Truma will cover parts and labour but not call out fee.