On our main TV the teletext is not working but it does work on my small Samsung TV in the kitchen through my Humax set top box

The Humax Box has a lot of issues!

https://www.google.com/search?q=Samsung+DV3+connect+to+Humax+YS-5000

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Question edited for clarity, 'humex' to 'Humax'.
Question moved from Cars and Trucks category.

They make a few models, but here an instruction manual. They can all be found using Google 'make MODEL manual'.
https://manuals.plus/m/0138caa99174c297359582f8a646f28b2f701887be87631db85aed03fd9d43a6

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The main board to your TV & the power regulator board should be checked. Your set need a through check-up. Contact any service technician. Electro help

Note that this type of device is designed to be left on at all times, so should not be switched off each night. I suspect that it has some slight corruption in the user-settings, so a factory reset may be required.

The teletext button on the remote control handset, has usually a toggle action. One press for on and another press for off.
Hope that helps.

You can download Onkyo universal remote codes with instructions here.

I hope that helps.

The Humax PVR-150T will definitely have problems using an indoor set top aerial; this is true of almost all Freeview receivers. Freeview signals are typically hundreds of times weaker than terrestrial transmissions and if you've managed with a set top aerial so far it's been working more by luck than design. I find that most set top aerials are so badly made that they're often faulty when new, but as most tend to flogged cheaply at markets and car boot sales the supply chain has no incentive to improve the product.

There has recently been a national Freeview retune, to complete this correctly your box needs the kind of solid and reliable signal which you cannot get with a set top aerial. Some receivers had compatibility issues with the retune and in many cases manufacturers broadcast OAD's (Over Air Downloads) to update the firmware in the boxes to be compatible. OAD's almost never successfully install via set top aerials.

There is an official list of Freeview devices which are known to have problems with the retune; unfortunately it has not proven to be a comprehensive list. The Humax MG-TU1 is one of those which have had problems and from memory it's closely related to your Humax PVR. The official advice is that you contact Humax directly on 0870 247 8800, but they'll probably instruct you to test your box using the aerial system it's designed to use before they'll be interested in offering further assistance.

The option will be in the menu of your tv to turn off CC or closed captioning. However if you have a digital cable box or Satellite box, the Closed captioning may be being generated from the box and not your tv, so check there as well.

Hi Philip,

You will need to check your SCART cable, that is the most logical point of failure. The manual can be downloaded from the Humax support website:
http://www.humaxdigital.com/uk/support/downloadcenter_manual.asp
http://www.humaxdigital.com/global/products/new_manual/F2FOXT100GB_0805.pdf