Hello,

i have been to 2 diferent mechanics and both told me to find a electician.

i have 3 error faults on my car

P300400 Low heat output relay-J359 Open circuit/short circuit to ground

P300600 High heat output relay -J360 Open circuit/short circuit to ground

00447 upper limit exeeded function due to excesive voltage

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How to fix?

Which is the relay that burnt out?

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i did check the outside fusebox all are ok.

i seen the relay block behind the fusebox ....that will be a pain to access .

skoda fabia mk2 2014 1.2tsi left hand drive

Thank you

Check fuse 29 in the cabin fusebox.

fuse 29 is empty :)) because i check fuse 28

Should it be a fuse there ?

can tell me if im wrong

Fuse 29, 10A supplies the relay coils of both of these relays, so if it is missing, those error messages can be expected, and no electrical cabin heating.

Funny thing is that the heating works. hot and cold is coming in. i will add a 10a fuse there and see what happens

Very fast appearance of hot air even with cold engine?

what fuse is missing more? i see fuse 48 is missing too :))

Just now, Breezy_Pete said:

Very fast appearance of hot air even with cold engine?

yes

It's difficult to say which fuses any particular individual car should or should not have fitted, but in the case of fuse 48 it's easy. From May 2013 > it is described as 'not assigned'.

Just now, Breezy_Pete said:

It's difficult to say which fuses any particular individual car should or should not have fitted, but in the case of fuse 48 it's easy. From May 2013 > it is described as 'not assigned'.

i will add a 10a fuse there and see if that fixes the problem. i will have to go to the mechanic again because i dont have a diagnostic tool

Look carefully into each fuse location, where there are no fuses, and see if there are the metal contacts top and bottom that would actually make electrical contact and physically hold a fuse in place. If one or both metal contacts are missing, no fuse can be fitted there.

4 minutes ago, BigGibril said:

...

yes

Like within 1 minute, noticeably warm air?

1 minute ago, Breezy_Pete said:

Like within 1 minute, noticeably warm air?

yes not super hot but worm. hot air comes in max 10 minutes. having in mind i live in sweden is 6 celsius today. hot air is most of the time on for me.

one more thing fuse 33 is missing to. before i go to the mechanic to check the errors again :))

25 minutes ago, BigGibril said:

one more thing fuse 33 is missing to. before i go to the mechanic to check the errors again :))

I guess you mean 34, I can see 33 is there, and your engine ECU would not work well without 33!

Fuse 34 looks like it is used on some engine variants, but not yours.

36 minutes ago, Breezy_Pete said:

Look carefully into each fuse location, where there are no fuses, and see if there are the metal contacts top and bottom that would actually make electrical contact and physically hold a fuse in place. If one or both metal contacts are missing, no fuse can be fitted there.

yes you are right 33 is ok, counted wrong and it dont have contacts too :))

i will come back later this week me with a update for the diagnostic

the mechanic did not have time today

thank you @Breezy_Pete a legend

can you recomend a cheap diagnostic tool, or solution so i can do it myself?

Not sure about cheap diagnostics, I use VCDS which some people regard as expensive.

If you have very good eyesight, and good lighting, (or just cunning use of mobile phone camera) the fuse locations are all numbered.

well i'll be darn. did not notice.

learn every day

thank you

i will come back to answer if the problem is fixed as soon as i find a mechanic to diagnose the car